Tektronix 070-8030-01 инструкция обслуживания

Service Manual 1780R-Series V ideo Measur ement Set SN B030000 & Up 070-8030-01 This document supports firmware version 1.16 and above. W arning The servicing instructions are for use by qualified personnel only . T o avoid personal injury , do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to p[...]

Copyright © T ektronix, Inc. All rights reserved. T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Printed in the U.S.A. T ektronix, Inc., P .O. Box 1000, W ilsonville, OR 97070?[...]

Service Assurance If you have not already purchased Service Assurance for this product, you may do so at any time during the product’ s warranty period. Service Assurance provides Repair Protection and Calibration Services to meet your needs. Repair Protection extends priority repair services beyond the product’ s warranty period; you may purch[...]

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W ARRANTY T ektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of three (3) years from the date of shipment. If a product proves defective during this warranty period, T ektronix, at its option, either will repair the defective product without charge for parts and l[...]

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1780R-Series Service Manual i T able of Contents General Safety Summary xi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Safety Summary xiii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface xv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

T able of Contents ii 1780R-Series Service Manual Operating Information 2–27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front-panel Controls 2–28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Measurement Controls 2–31 . . . . . . . . . . . . . . . . . . [...]

T able of Contents 1780R-Series Service Manual iii Adjustment Procedures General Information 5–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recommended Equipment List 5–4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjustment List 5–8 . . . . . . . . . . . . . [...]

T able of Contents iv 1780R-Series Service Manual Options CR T Options 7–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Cord Options 7–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Parts List Diagrams Mechanical Parts [...]

T able of Contents 1780R-Series Service Manual v List of Figures Figure 1–1: Simplified r epresentation of the 1780R-Series V ideo Measurement Set 1–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2–1: Rear panel for the T ektronix 1780R-Series Measurement Set 2–3 . . . . . . . . . . . . . . . . . . . . . . . . [...]

T able of Contents vi 1780R-Series Service Manual Figure 4–1: 5% signal Attenuator for checking differ ential gain 4–4 . . . . Figure 4–2: Rear view of the X Y plug connections. (Pins 2, 4, 6, 10, 12, and 14 can be used to make ground connections.) 4–5 . . . . . . . Figure 4–3: REMOTE connector modified for Remote Sync input 4–5 . . Fig[...]

T able of Contents 1780R-Series Service Manual vii Figure 5–1 1: Adjustment locations on the V ectorscope circuit board (Assembly A6) 5–21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 5–12: Connections for adjusting the calibrator amplitude 5–22 . . . Figure 5–13: Input & BNC cir cuit boar[...]

T able of Contents viii 1780R-Series Service Manual List of T ables T able 1–1: Input/Output 1–4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T able 1–2: W aveform Monitor V ertical System 1–5 . . . . . . . . . . . . . . . . . T able 1–3: W aveform Monitor Probe Input 1–8 . . . . . . . . . . . . . . . . . . . [...]

T able of Contents 1780R-Series Service Manual ix T able 5–1: Recommended Equipment 5–4 . . . . . . . . . . . . . . . . . . . . . . . . . T able 5–2: 1780R-Series Adjustments for Calibration Procedure 5–8 . . T able 5–3: 1780R-Series Initial Control Settings 5–12 . . . . . . . . . . . . . . . . . T able 5–4: Low V oltage Power Supply [...]

T able of Contents x 1780R-Series Service Manual[...]

1780R-Series Service Manual xi General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. T o avoid potential hazards, use this product only as specified. Only qualified personnel should perform service pr ocedures. Use Proper Power Cord. Use only the power cord[...]

General Safety Summary xii 1780R-Series Service Manual T erms in this Manual. These terms may appear in this manual: W ARNING. W arning statements identify conditions or practices that could r esult in injury or loss of life. CAUTION. Caution statements identify conditions or practices that could r esult in damage to this pr oduct or other property[...]

1780R-Series Service Manual xiii Service Safety Summary Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service procedures. Do Not Service Alone. Do not perform internal service or adjustments of this product unless another person capable of rendering [...]

Service Safety Summary xiv 1780R-Series Service Manual[...]

1780R-Series Service Manual xv Preface This Service Manual is part of a 2-volume set. Its companion manual is the Operator ’ s Manual, which is aimed primarily at operating personnel. Information in this volume is intended for those who are required to maintain the 1780R-Se- ries V ideo Measurement Set. Specific instructional procedures can be fo[...]

Preface xvi 1780R-Series Service Manual[...]

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1780R-Series Service Manual 1–1 Product Description The T ektronix 1780R-Series V ideo Measurement Set is a 19-inch wide, 5 1/4-inch high, 18-inch deep dual-CR T W aveform Monitor/V ectorscope. It weighs approximately 28 pounds and is intended for rack-mount applications, but can also be configured as a full (rack) width cabinet model for bench a[...]

Product Description 1–2 1780R-Series Service Manual signals. The probe input has gain and input compensation for both X1 and X10 probes. The instrument control system is based on a National Semiconductor 32CG16 Microprocessor , with an additional line rate processor that makes line-by-line measurement decisions. Front-panel switching and CR T tou[...]

1780R-Series Service Manual 1–3 Specifications This section of the manual contains the specifications for the 1780R-Series. T abular information is divided into two categories. First there are the Perfor- mance Requirements which is assured by T ektronix Inc. Second are the items in the Supplemental Information column, which due to a number of re[...]

Specifications 1–4 1780R-Series Service Manual T able 1–1: Input/Output Characteristic Performance Requirement Supplemental Information Performance Check Step V ertical Ranges V olts Full Scale Accuracy 1.0 1.0 V ± 0.007 V . Peak-to-peak Amplitude for Full Graticule 1.0 volt/140 IRE. 4 Va r ≤ 0.5:1 to ≥ 1.5:1 (0.67 V to 2.0 V input signal [...]

Specifications 1780R-Series Service Manual 1–5 T able 1–2: Waveform Monitor V ertical System Characteristic Performance Requirement Supplemental Information Performance Check Step Return Loss CH A, B1 , B2, or B3 >40 dB DC to 5 MHz. (T erminated in 75 W .) 58 Aux Video In, Aux Video Out, & Pix Mon Out >34 dB DC to 5 MHz. Instrument On[...]

Specifications 1–6 1780R-Series Service Manual T able 1–2: Waveform Monitor V ertical System (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement DC Restorer Clamp Point Backporch or Sync Tip. (All clamps controlled together .) 21 Mains Hum Atten. Slow Clamp ≤ 0.9 dB. Attenuation ≤ 10%. 22 Fast Clam[...]

Specifications 1780R-Series Service Manual 1–7 T able 1–2: Waveform Monitor V ertical System (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Diff Steps (Differentiated Steps Attenuation) >40 dB at 3.58 MHz (4.43 MHz P AL). 5 step, 20 IRE staircase within 2% of flat display . V ertical Gain incre[...]

Specifications 1–8 1780R-Series Service Manual T able 1–3: Waveform Monitor Probe Input Characteristic Performance Requirement Supplemental Information Performance Check Step Input Resistance 1 M W . Input RC Product 20 m s (20 pF). Gain Unity ± 3%. With gain adjusted for equivalent 1 V peak-to-peak display . 30 Frequency Response 25 Hz to 10 [...]

Specifications 1780R-Series Service Manual 1–9 T able 1–4: Waveform Monitor Horizontal Deflection System (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Sweep Linearity 1 Line (5 m s/Div .) ± 1%. 34 2 Line (10 m s/Div .) ± 1%. 3 Line (15 m s/Div .) ± 1%. 1-Field Sweep ± 0.5 division. 2-Field Sw[...]

Specifications 1–10 1780R-Series Service Manual T able 1–4: Waveform Monitor Horizontal Deflection System (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement RGB/YRGB Staircase Input Amplitude A +10 V input will result in a horizontal display of 9 divisions ± 1.4 major divisions. Ground to +10 V . +10[...]

Specifications 1780R-Series Service Manual 1–1 1 T able 1–5: Waveform Monitor dG and dP Display Characteristic Performance Requirement Supplemental Information Performance Check Step Differential Gain Deflection Factor 5% dG deflects the trace 50 IRE (NTSC) or 500 mV (P AL) ± 5%. W aveform gain X1, V ar . Gain off. V ector gain adjusted to pla[...]

Specifications 1–12 1780R-Series Service Manual T able 1–6: Synchronization Characteristic Performance Requirement Supplemental Information Performance Check Step Sync Input Internal Ref. Sync Separator 0.2 to 2.0 V peak-to-peak com- posite video. Composite video applied to Inputs A, B1, B2, or B3 or probe. 42 Int. Sync Separator 0.5 to 2.0 V p[...]

Specifications 1780R-Series Service Manual 1–13 T able 1–6: Synchronization (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Jitter from missing line sync pulses <15 ns per missing sync pulse. Maximum of 10 consecutive line sync pulses. Slow Sweep T riggering Signal APL change from 10% to ≤ 90%[...]

Specifications 1–14 1780R-Series Service Manual T able 1–7: V ectorscope V ector Display (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Display V ector Phase Accuracy ± 1.25 _ . Measured with color bar signal. 49 V ector Gain Accuracy ± 2.5% (1.25 IRE). Quadrature Phasing ± 0.5 _ . Subcarrier R[...]

Specifications 1780R-Series Service Manual 1–15 T able 1–7: V ectorscope V ector Display (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement V ariable GAIN Range +14 dB to –6 dB of 75% color bar preset gain. Unterminated color bar signal can be brought to appropriate targets. Burst from a triple term[...]

Specifications 1–16 1780R-Series Service Manual T able 1–9: V ectorscope SCH Phase Display (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Input Timing Correct relative SCH operation with displayed video delayed up to 2 m s or advanced up to 1.5 m s relative to external reference. Display Range Ext[...]

Specifications 1780R-Series Service Manual 1–17 T able 1–1 1: Power Requirements (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Crest Factor ≥ 1.3. Power Consumption 120 Watts maximum. T able 1–12: Environmental Summary Characteristic Performance Requirement T emperature Operating 0 _ C to +50[...]

Specifications 1–18 1780R-Series Service Manual T able 1–14: Certifications and Compliances EC Declaration of Conformity – EMC Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility . Compliance was demonstrated to the following specifications as listed in the Official Journal of the European Communities: EN 50081-1 Emissions:[...]

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1780R-Series Service Manual 2–1 Installation Overview This section provides information on both mechanical and electrical installation of the 1780R-Series V ideo Measurement Set. Be sure to read this material prior to physically mounting the instrument in either a rack mount or portable configuration. The shipping carton and pads provide protecti[...]

Installation 2–2 1780R-Series Service Manual In addition to the standard accessories in T able 2–1 there are a number of optional accessories that can be purchased, such as a portable case, maintenance kits, etc., to complement the 1780R-Series V ideo Measurement Set. For more information contact a T ektronix Inc. field office or distributor . [...]

Installation 1780R-Series Service Manual 2–3 Figure 2–1: Rear panel for the T ektronix 1780R-Series Measurement Set EXT REF . High impedance bridging loop through connector for either composite sync or black burst. AUX IN. 75 W input for video signals. Insertion point follows the internal filters. AUX OUT . 75 W video signal output just prior t[...]

Installation 2–4 1780R-Series Service Manual Installation Requirements The 1780R-Series is designed for efficient use of rack space. It can be mounted flush with other equipment, eliminating the need for air circulation above and below the cabinet. It should not be mounted flush with equipment that is a significant heat source, because heat condu[...]

Installation 1780R-Series Service Manual 2–5 Figure 2–2: Settings for the rear-panel mains selector switch In addition to being able to configure the 1780R-Series through user interaction with a series of CR T -presented menus, there are some specific operating situations that can be selected by changing internal plug jumpers or Dual-Inline- Pa[...]

Installation 2–6 1780R-Series Service Manual T able 2–3: Plug Jumpers for Waveform Board (Assembly A2) (Schematic Diagrams 3 through 15) Jumper Number Name Plug Position Purpose J192 <9> Remote Sync Polarity 1-2 { 2-3 Positive Negative J585 <10> RGB YRGB 1-2 2-3 { 3-Step RGB Parade 4-Step YRGB Parade J858 <9> Sound-in-Syncs 1-[...]

Installation 1780R-Series Service Manual 2–7 T able 2–4: Plug Jumpers and DIP Switch on the Microprocessor Board (Assembly A5) (Schematic Diagrams 16 through 19) Jumper Number Name Plug Position Purpose J342 <16> m Processor Restart Maintenance } Removed { Installed Normal operation Non-maskable interrupt to processor J344 <16> m Pr[...]

Installation 2–8 1780R-Series Service Manual T able 2–5: Plug Jumpers for V ectorscope Board (Assembly A6) and Oscillator Board (Assembly A7) (Cont.) Jumper Number Purpose Plug Position Name J320 (A7) <34> Diff Phase Display 1-2 { 2-3 Double (H)/4 Single (V)/2 { Factory installed position. The video input connectors can be isolated from g[...]

Installation 1780R-Series Service Manual 2–9 The rear-panel REMOTE connector is a subminiature 15-pin D-type receptacle with female contacts. All the active remote control lines can be forced low by remote ground closures or TTL levels. Pin assignments for the REMOTE connector are shown in Figure 2–4. Figure 2–4: Remote connector and the func[...]

Installation 2–10 1780R-Series Service Manual The rear-panel SERIAL interface connector is a 9-pin, sub-miniature, D-type connector . It is used as an RS422A or RS232D interface to the 1780R-Series microcontroller , drivers for both interfaces are resident. RS422A is a balanced voltage digital interface, while RS232D is a serial binary data inter[...]

Installation 1780R-Series Service Manual 2–1 1 (of the 9-pin male connector) and pin 7 (of the 25-pin female connector). In addition, pins 4 and 5 and pins 6, 8, and 20 of the 25-pin connector will need to be wired together . See Figure 2–6. Figure 2–6: RS232D serial interface adapter diagram The command set for the the 1780R-Series SERIAL in[...]

Installation 2–12 1780R-Series Service Manual Responses from the 1780R-Series SERIAL interface are shown in T able 2–7. T able 2–7: Serial Remote Responses Command Description A The transmission was successful (ACK) C Command not known. (The # character was received, but was not followed by a U, u, D, d, P , or p.) D Bad data received (all ex[...]

Installation 1780R-Series Service Manual 2–13 8 1 9 15 Figure 2–7: Rear-panel XY connector diagram showing the function of each pin Mechanical Installation All qualification testing for the 1780R-Series was performed with the rack- mount cabinet installed. T o guarantee compliance with specifications, the instrument should be operated in a cabi[...]

Installation 2–14 1780R-Series Service Manual Rack Mounting The 1780R-Series The 1780R-Series rack-mounting cabinet is designed for permanent mounting. The instrument slides in and out of the cabinet with relative ease. The instrument is secured in the cabinet with four 6–32 TORX R drive screws. See Figure 2–8. Figure 2–8: Location of the f[...]

Installation 1780R-Series Service Manual 2–15 Figure 2–9: Dimensions used for rack mounting the 1780R-Series Video Measurement Set Figure 2–10: Dimensions of the adjustable rear rackmounting bracket[...]

Installation 2–16 1780R-Series Service Manual T o install the instrument in the rack: First remove the four securing screws and take the instrument out of the rack-mounting cabinet. (All 1780R-Series instruments are shipped in the rack-mounting cabinet to provide extra shipping protection.) Once the instrument is out of the cabinet, mount the fro[...]

Installation 1780R-Series Service Manual 2–17 The 1780R-Series can be mounted in a portable case. This case is an optional accessory , and is nomenclated 1780F02. The portable case consists of a metal cabinet with feet, front elevating bail, carrying handle (all installed), and front and back protective covers. See Figure 2–12. Instrument mount[...]

Installation 2–18 1780R-Series Service Manual In the procedures that follow the 1780R-Series front-panel control names are in ALL CAPIT ALS and menu items are enclosed in <>. The Calibration menu is available for both vector and waveform, and uses both CR T s. Pushing the front-panel CALIBRA TE button provides access to the menu. Several ca[...]

Installation 1780R-Series Service Manual 2–19 2. Push the front-panel CONFIGURE button and touch <FIXED CAL AMPL> until 1000 (1.0 V olt) is outlined. 3. Push the front-panel CALIBRA TE button. Push the button below the W aveform CR T . 4. <READOUT INTENSITY> will be circled on the V ectorscope CR T . Use the large knob to adjust inten[...]

Installation 2–20 1780R-Series Service Manual 10. Select <VER T CAL> as shown in Figure 2–13. The large knob will now adjust signal amplitude with respect to the graticule. Adjust for a 1 V olt display on the W aveform CR T . Leave the CALIBRA TE button set to On. Figure 2–13: Waveform Calibration menu display 11 . Select an input chann[...]

Installation 1780R-Series Service Manual 2–21 12. Apply a 1.0 volt signal to the EXT HORIZ input. T ouch <EXT HORIZ CAL>. The large knob will now adjust sweep length (time) with respect to the graticule. Do not change the MAG setting (automatically set to 100 mV/div). Adjust the large knob for a horizontal display of 10 divisions. 13. Press[...]

Installation 2–22 1780R-Series Service Manual 7. T ouch <TRACE ROT A TION> to obtain a test axis, then use the large knob to adjust trace rotation on the V ectorscope CR T . Align the horizontal lines of the electronic graticule parallel with the V ectorscope CR T graticule. 8. T ouch <CAL OSC> until <ON> is outlined. While the [...]

Installation 1780R-Series Service Manual 2–23 Figure 2–14: 1780R (NTSC) V ectorscope Calibration menu display with CAL OSC on Figure 2–15: 1781R (P AL) V ectorscope Calibration menu display[...]

Installation 2–24 1780R-Series Service Manual Repackaging If the instrument is to be shipped to a T ektronix Service Center , attach a tag to the instrument showing: 1. Owner (with complete address) and the name of the person at your firm that can be contacted. 2. Instrument serial number and a description of the service required. Repackaging the[...]

Installation 1780R-Series Service Manual 2–25 Figure 2–16: 1780R-Series repackaging[...]

Installation 2–26 1780R-Series Service Manual[...]

1780R-Series Service Manual 2–27 Operating Information In order to effectively service the 1780R-Series it is essential to understand how the controls work. Controls and switches fall into one of four groups; Display (Scale, Focus, Intensity and Positioning), Special Purpose (Preset, Measure, Configure, and Calibrate), Precision Measurement (Curs[...]

Operating Information 2–28 1780R-Series Service Manual 1 23 48 56 7 9 1 0 19 1 8 1 7 16 15 11 1 2 13 14 Figure 2–18: Front panel of the 1780R-Series Video Measurement Set Front-panel Controls W ith the exception of the POWER switch, all of the switches and controls on the 1780R-Series front panel fall into the general groupings of Special Purpo[...]

Operating Information 1780R-Series Service Manual 2–29 7. VER T POS. Positions the selected display up and down. Positioning range depends on the display selected; range is much greater for the waveform monitor displays than it is for the vectorscope displays. 8. HORIZ POS. Positions the selected display left and right. Positioning range depends [...]

Operating Information 2–30 1780R-Series Service Manual 19. < >. A pair of momentary contact switches that provide stepped levels that duplicate the function of the Precision Measurement control.[...]

Operating Information 1780R-Series Service Manual 2–31 Functional Measurement Controls Functional Measurement Controls are shown in Figure 2–19. Note that the numerical entries are enclosed in rectangles instead of the circles that were used in Figure 2–18. 12 3 4 8 5 6 7 9 10 19 20 18 17 16 15 11 12 13 14 Figure 2–19: The right front panel[...]

Operating Information 2–32 1780R-Series Service Manual 3. P ARADE / OVERLA Y . Momentary contact switch that cycles through selections of sequential displays that can be up to 3 lines or 3 fields on a single display , depending on the selected waveform sweep. 4. WFM / WFM + CAL. Momentary contact switch that cycles through selections of standard [...]

Operating Information 1780R-Series Service Manual 2–33 transitions) display . Small front-panel light-emitting diodes indicate the selected filter . 11 . ONE / TWO / THREE. Momentary contact switch that toggles through two sweep positions (1-line or 1-field and 2-line or 2-field; 3-line or 3-field is activated by holding the button in). Small fro[...]

Operating Information 2–34 1780R-Series Service Manual[...]

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1780R-Series Service Manual 3–1 Theory of Operation Contents of this section are designed to work with the block and schematic diagrams in Section 9, at the back of this manual. Each schematic diagram description begins with a small block diagram of the circuits on that page and a short overview relating the illustration to the circuit theory tha[...]

Theory of Operation 3–2 1780R-Series Service Manual This diagram contains the interface to the front-panel switches, indicators, and touch panels along with the rear-panel serial and remote connectors. In addition, it contains circuitry that controls internal switching functions and generates readout for both CR T s. This diagram contains the bla[...]

Theory of Operation 1780R-Series Service Manual 3–3 T able 3–1: Schematics and Circuit Board Assemblies Diagram Number Schematic Name Assembly Name Assembly Number 1 Input Amplifiers A and B1 Input A1 2 Input Amplifiers B2 and B3 Input A1 3 Probe Input & DC Restorer V ectorscope & Waveform A6 & A2 4 Input & Reference Selection W[...]

Theory of Operation 3–4 1780R-Series Service Manual T able 3–1: Schematics and Circuit Board Assemblies (Cont.) Diagram Number Assembly Number Assembly Name Schematic Name 32 Digital Shifter Oscillator A7 33 Horiz AFC & Post Regulators Oscillator A7 34 Diff Gain/Phase Alt Mode Switch Oscillator A7 35 Digital Recursive Filter Filter A15 36 Z[...]

Theory of Operation 1780R-Series Service Manual 3–5 Diagrams 1 & 2 Input Amplifiers The Input board contains four amplifiers that give the input signal gain, DC restore it, and send it to the + and – Amplifiers. Since they are identical circuits, only the operation of Channel A will be described. Channel A Input. The input signal is connect[...]

Theory of Operation 3–6 1780R-Series Service Manual inverting input, pin 2 of U418) form a low-pass filter , with a notch at the subcarrier frequency . U418 drives C543, which holds charge during the active portion of the video line. When Q408 is on, C512 is in parallel with C521, and the DC Restorer response is slowed so that 60 Hz (50 Hz for 14[...]

Theory of Operation 1780R-Series Service Manual 3–7 Diagram 3 Probe Input and DC Restorer The 1780R-Series is equipped with a front-panel Probe Input, which allows it to be used to make some measurements not normally possible with a waveform monitor or vectorscope. The Probe Input is a high impedance input that can also be used as another video i[...]

Theory of Operation 3–8 1780R-Series Service Manual The voltage follower drives a current-mode feedback amplifier consisting of Q492, Q390, and Q294. The gain is set by the feedback network consisting of R393, R396, R394, R295, and Q295. When the instrument is configured for X1 probe gain, Q295 is off and R393 and R396 set the amplifier gain to 1[...]

Theory of Operation 1780R-Series Service Manual 3–9 hum is not attenuated. The DC Restorer is turned off by the absence of the sample pulses at the sample input (pin 5) of U1217. Hold capacitors C1216 and C1313 discharge to 0 volts through R1314, and the emitter of Q1215 stays at 0 volts. Operational amplifier U121 1 (along with C1212, C1211, R1 [...]

Theory of Operation 3–10 1780R-Series Service Manual Diagram 4 Input & Reference Selection The + and – Amplifiers select the appropriate input signal for display . The + Amplifier output goes to the + input of the Difference Amplifier , while the – Amplifier output goes to the – input. The four video signals from the Input Amplifiers ar[...]

Theory of Operation 1780R-Series Service Manual 3–1 1 Video Input Selection. Each video switch is an operational amplifier connected for unity gain, and consists of six differential amplifier inputs. An input is selected by biasing the appropriate differential pair with current from current sources Q1427 and Q1438. This biasing current is steered[...]

Theory of Operation 3–12 1780R-Series Service Manual Diagram 5 Difference Amplifier & Video Filters The signal at the output of the Difference Amplifier is distributed to many internal circuits. Seventy-five-ohm video is provided to the Auxiliary Output and Picture Monitor BNC connectors. There is an additional current source to provide brigh[...]

Theory of Operation 1780R-Series Service Manual 3–13 Only one signal is switched through the saturating transistor at a time, although Flat, Luminance, and Chroma may be time multiplexed. The luminance filter has a 1 MHz bandwidth and a transmission zero at the subcarrier frequency . It has been optimized for best transient response. This filter [...]

Theory of Operation 3–14 1780R-Series Service Manual Chrominance Filter . The chrominance filter is a Lerner -type filter , exhibiting arithmetic symmetry and linear phase across its bandwidth. U827 amplifies the filtered chrominance signal to drive both the W aveform Monitor and V ectorscope circuits. Differentiated Step Filter . U840A and B wit[...]

Theory of Operation 1780R-Series Service Manual 3–15 Diagram 6 V ertical Deflection The current output of the filters passes through a common base amplifier which drives a Gilbert multiplier (V ariable Gain Amplifier). Output current from the V ariable Gain Amplifier drives inputs to two separate differential amplifiers (X1 and X5). The other sid[...]

Theory of Operation 3–16 1780R-Series Service Manual gives them five times greater transconductance. Current from U415B is switched to the appropriate differential pair by U415A and U415D. The dif ferential pair that is off has a high impedance so that it does not af fect the other pair . The second input to the differential pairs is connected to[...]

Theory of Operation 1780R-Series Service Manual 3–17 Diagram 7 V ertical Control Logic, Calibrator , & Cursors The Microprocessor controls the vertical functions through three 8-bit latches. These are all static logic levels. Dynamic switching, such as the Ch-A/Ch-B Parade display , is achieved by state machines in logic arrays, and is timed [...]

Theory of Operation 3–18 1780R-Series Service Manual T able 3–2: Input Channel Selection Logic per i M e p (U1415) (U1415) Par Mode Internal Reference O per at i ng M od e In p ut(s) I 1 I 2 I 3 I 4 I 5 I 6 I 7 I 8 SINGLE INPUT A 00000000 CH A SINGLE INPUT B1 00010000 CH B1 SINGLE INPUT B2 00100000 CH B2 SINGLE INPUT B3 00110000 CH B3 SINGLE IN[...]

Theory of Operation 1780R-Series Service Manual 3–19 DC Restorer and Reference Selection. Data for the reference and DC Restorer is latched in by U1506. This latch controls input coupling and DC Restorer operation along with the internal/external reference selection. Filter Selection. The encoded 4 bits of filter selection data is latched in by U[...]

Theory of Operation 3–20 1780R-Series Service Manual U1 105 is a logic array that selects the timing rate (pin 16) for the logic on this schematic. HSYNC or VSYNC is selected depending on whether the horizontal sweep rate is at a line rate or field rate. V oltage Cursors. U1019B is the V oltage Cursor Amplifier . Upper and lower voltage levels ar[...]

Theory of Operation 1780R-Series Service Manual 3–21 Diagram 8 Reference Sync Generation Both Internal and Reference sync inputs are filtered by active low-pass filters. The Internal Sync Separator is a descrete clamped operational amplifier circuit that is clamped just above sync tip level to clip off active video. The Reference Sync Separator i[...]

Theory of Operation 3–22 1780R-Series Service Manual R1 156 and R1253 setting the AC gain. CR1155, CR1254, U1 159A, and C1254 form the feedback clamp. The clamp sets sync tip to +3 V at the operational amplifier output (U1 159 pin 1). U1159B and R1260 provide a constant current discharge path for C1254 during sync time. The clamp voltage is varie[...]

Theory of Operation 1780R-Series Service Manual 3–23 pulse when the 50% sync point corresponds with a negative subcarrier zero crossing ± 80 ° . This positive-going output pulse drives the SCH color framing logic on Diagram 14.[...]

Theory of Operation 3–24 1780R-Series Service Manual Diagram 9 H & V Sync Generators The Horizontal and V ertical (line and field) Sync Generators extract the synchronizing signals from the output of the Reference Sync Separator (Diagram 8) or the Remote Sync Input to supply the required sync signals for the rest of the instrument. In the abs[...]

Theory of Operation 1780R-Series Service Manual 3–25 U185D or U185A being gated through. The output of U185C is Reference Sync and Direct Remote Sync. V Sync Detector . Q385 and Q391 form an integrating Sync Detector that has an output when the vertical broad pulse occurs. Q385 is saturated for all of the field, except during the vertical sync pu[...]

Theory of Operation 3–26 1780R-Series Service Manual Ref H Sync Generator . The Reference Horizontal Sync Generator is made up of two one-shot multivibrators. U596B is triggered by the direct or AFC sync from the Direct or AFC switch. Its Q output is a 0.5 m s pulse whose trailing edge triggers the second one-shot. Using the trailing edge of the [...]

Theory of Operation 1780R-Series Service Manual 3–27 too long for P AL signals, a jumper (on Diagram 10) is provided to realign the Fld Retrace Gate with V sync. See Field Sweep Gate description, on Diagram 10, for details. Clamp Pulse Generator for W aveform Display . U858B is a retriggerable one-shot multivibrator that generates a 2 s clamp pul[...]

Theory of Operation 3–28 1780R-Series Service Manual Diagram 10 Ramp Generator The Ramp Generators produce the line and field sweep ramps for the waveform displays. The slope of the ramp, for 1- 2- or 3-line or field sweep, is controlled by a Digital-to-Analog Converter (DAC). Initiation of retrace and sweep start is controlled, through sweep gat[...]

Theory of Operation 1780R-Series Service Manual 3–29 When the sweep ramp has reached approximately 3/4 of its final amplitude the End of Sweep Detector outputs a high on the pin 1 input of U775A (OR gate) to provide a high on one input of U780A (an AND gate). The next +Ref H sync will AND U780A causing Q589 to turn on and force the Line Ramp Gene[...]

Theory of Operation 3–30 1780R-Series Service Manual In 3-field sweep modes the FLD Retrace Gate is always high. The Field Ramp Generator End of Sweep Detector outputs a high in the last third of the ramp. ANDing through U760B does not occur until significantly after the second V sync to ensure that the next V sync will again retrace and start th[...]

Theory of Operation 1780R-Series Service Manual 3–31 Whenever either End of Sweep Detector goes high U790B outputs a correspond- ing high (T rig En) to synchronize cursor display , calibrator display , and differential gain and phase displays. Retrace Switch Blanking. Sweep blanking occurs whenever the output of U775D (an OR gate) goes high. In f[...]

Theory of Operation 3–32 1780R-Series Service Manual Diagram 1 1 Horizontal Magnifier & Output Amplifiers The Magnifier Amplifier provides selection of fixed voltage gains for the Line and Field Ramp Generator sweep ramps. This provides the time per division variation on the horizontal axis of the CR T display . In addition, the Magnifier Amp[...]

Theory of Operation 1780R-Series Service Manual 3–33 gain of the amplifier is increased. When a gain greater than X5 is selected, the lower gain transistors are also saturated, turning on up to all six attenuator transistors for X100 magnification. The capacitors C572 and C575 provide compensation for the amplifier at gains less than X50. At gain[...]

Theory of Operation 3–34 1780R-Series Service Manual Readout Switching. When /WFM READOUT EN is high, the H RO DA T A WFM signal is disconnected from the Output Amplifier by turning on Q267 to short the readout signal to the –2.2 volt supply . When Q267 is on, CR251 is reverse biased and the horizontal readout data is disconnected from the Outp[...]

Theory of Operation 1780R-Series Service Manual 3–35 Diagram 12 Horizontal Latches & DAC Eight-bit digital data from the Microprocessor , used to control horizontal as well as some vertical functions, is latched onto the circuit board. A Latch Select Decoder , using three address bits, controls the Data Latch operation. Data bits from the lat[...]

Theory of Operation 3–36 1780R-Series Service Manual Sample-and-Holds. The sample-and-holds sample the output of the DAC when its analog switch is closed. U708 is an analog multiplexer employed as a single- pole, 8-throw switch. U245 is a dual-in-line switch package using three sections. The Sampling Amplifiers are in U251, U605, and U810, which [...]

Theory of Operation 1780R-Series Service Manual 3–37 Diagram 13 Slow Sweep & Ext Horiz Input The External Horizontal Input Amplifier is a non-inverting amplifier that inputs a ramp voltage of ≈ 5 volts to produce a 10-division sweep ramp. The Slow Sweep Ramp Generator produces a ramp that is triggered by an APL change through 50%, or free-r[...]

Theory of Operation 3–38 1780R-Series Service Manual 50% to above, the output of the amplifier changes from being limited at the positive supply to being limited at the negative supply . This negative transition is coupled through C557, turning on Q658 to begin the ramp. When Slow Sweep T rigger is set to – a decreasing APL change, through 50%,[...]

Theory of Operation 1780R-Series Service Manual 3–39 Diagrams 14 & 15 SCH Phase Timing & Sync Locked Oscillator The 1780R-Series displays the horizontal sync to subcarrier phase relationship as a polar plot on its V ectorscope CR T . It generates a subcarrier rate signal, phase locked to the 50% point of sync that is demodulated against b[...]

Theory of Operation 3–40 1780R-Series Service Manual Logic and T iming to control the oscillator is generated, based upon the burst- sync relationship of reference video. Also, field identification information is provided to the MPU for line select. Finally , the burst-sync relationship of the reference video is determined. The Burst Phase Detect[...]

Theory of Operation 1780R-Series Service Manual 3–41 The oscillator output is divided by 4 with a Johnson counter internal to U990. The counter has four outputs that are 90 _ apart. These four signals drive a 4:1 multiplexer , also internal to U990, which is controlled by a flip-flop, U985 on Diagram 14, through pins 8 and 9. By controlling the m[...]

Theory of Operation 3–42 1780R-Series Service Manual U1497B is a D-type flip-flop that generates a negative pulse ( Q ) to turn on U1397 immediately after the Sample Gate again goes low . This flip-flop-gener- ated TSC pulse is approximately 1 subcarrier cycle in duration. Lock detection is done by U1497A, a flip-flop. When the loop is locked, th[...]

Theory of Operation 1780R-Series Service Manual 3–43 flip-flops drive U980 where a color field 1 pulse is output on pin 20 during line 1 1 (NTSC) or line 7 (P AL). The 1781 also outputs a Bruch frame pulse, on pin 21, during line 7 of fields 1 and 5. Both the field 1 and Bruch pulses are required by the MPU for line selection. An internally-refer[...]

Theory of Operation 3–44 1780R-Series Service Manual Diagrams 16 & 17 Master MPU, ROM & NVRAM The Master MPU kernel consists of the NS32CG16 processor , running at 10 MHz, and its associated clock, memory , and buffering circuitry . Also included here are the Internal Chip Select and W ait State Generator P ALs. The Master MPU is supporte[...]

Theory of Operation 1780R-Series Service Manual 3–45 The Master MPU normally does not use the Non-Maskable Interrupt (NMI) signal and it is held high by a pull-up voltage from one segment of R360. It can, however , be asserted for troubleshooting by placing a jumper across J342. Latches. The Master MPU uses a multiplexed data bus and the lower 16[...]

Theory of Operation 3–46 1780R-Series Service Manual Diagram 17 Dynamic RAM The Dynamic Random Access Memory (DRAM) is a 16-bit wide memory used by the readout engine for its instructions. The system consists of three major components; the memory array , an address multiplexer , and a control P AL. The memory array consists of four 4-bit architec[...]

Theory of Operation 1780R-Series Service Manual 3–47 The Master MPU memory access sequence starts when /ADS goes low , forcing Master MPUGO to be latched high by U595A&B and start the P AL sequence. /RASO, which is in-line terminated by R361 and becomes /RAS, goes low to enable the memory chip RAS input. The row addresses must be stable at th[...]

Theory of Operation 3–48 1780R-Series Service Manual high to remove the readout engine’ s address from the bus. The Control P AL then waits until the Master MPU raises /HOLDA, signifying its return to bus control. At this point the P AL enters the normal idle state to wait for the first Master MPU cycle. DRAM Memory . The DRAM consists of four [...]

Theory of Operation 1780R-Series Service Manual 3–49 Diagram 18 Line Rate Controller The Line Rate Controller provides real time control of the readout and line select functions for both the waveform monitor and vectorscope CR T s. It issues instructions to start, stop, hold, or skip readout. It determines if only readout is to be displayed, read[...]

Theory of Operation 3–50 1780R-Series Service Manual currently being used and a T askData stack that is being built for a new line number selection, or a different line rate, etc. The two bytes that are actually T askData consist of data bits that go to control lines (WLS LINE, WRO ST AR T , etc.) for the Readout Engine and Z-Axis at specific vid[...]

Theory of Operation 1780R-Series Service Manual 3–51 are ANDed together in U167 to produce a frame sync pulse. The frame sync pulse interrupts the Line Rate Controller and causes the line counter to be reset to zero, and resets the Static RAM stack pointer . In the 1781R 2 of 8 mode the BRUCH frame pulse provides the interrupt through U167. This [...]

Theory of Operation 3–52 1780R-Series Service Manual line allows execution of the instruction set to continue. By inserting one WFS per instruction set, the VRO ST AR T signal will control the refresh rate of the readout. V UNBLANK (P4.4) controls the blanking of the Z-Axis for the vectorscope CR T . This signal control line is one of four signal[...]

Theory of Operation 1780R-Series Service Manual 3–53 The output of the WRO ST AR T LINE is wire ANDed with the VRO ST AR T to provide an RO ST AR T control line at pin 12 of U165. WRO INHB (P5.4) is wire ANDed with the control line from pin 7 of U167 and fed to the one-shot, U453A. the LINE SEL RETRACE at the output of U453A rephases the Sweep Ge[...]

Theory of Operation 3–54 1780R-Series Service Manual Diagram 19 UART & A/D The Universal Asynchronous Receiver/T ransmitter (UAR T) has both RS-232 and RS-422 buffers for communication between the Master MPU (Diagram 16) and external peripherals. By using two buffers and internal terminations it is possible to use a single rear-panel 9-pin, D[...]

Theory of Operation 1780R-Series Service Manual 3–55 J595. Pins 7 and 8 of U495 go to connector J495. This connector is used by the factory to connect to peripheral equipment when developing software. A to D Converter . The A/D Converter , U217, combines a 16-bit analog multiplex- er with an 8-bit A/D Converter . The multiplexer is set by accessi[...]

Theory of Operation 3–56 1780R-Series Service Manual provide a 2-field sweep. Remote sync is AC-coupled with an input impedance of approximately 1 M W . Q392 is a switching transistor that is turned off when Remote Sync Enable is present and saturates when there is no enable present. Remote sync polarity is selected by changing a plug-jumper on D[...]

Theory of Operation 1780R-Series Service Manual 3–57 Diagram 20 Readout Engine & Read Output The asynchronous Readout Engine outputs the readout characters that are displayed on the vectorscope and waveform monitor CR T s. Digital data from the Dynamic RAM is converted to an analog output for display . The D/A Converters are loaded from the I[...]

Theory of Operation 3–58 1780R-Series Service Manual State Machine Latch. The 4-bit output of the Data Latch is input to the State Machine Latch (U171, U376, and U385). In addition to the outputs from the Data Latch, control signals from the Line Rate Controller are latched by the State Machine Latch at a 500 kHz rate to control the Readout State[...]

Theory of Operation 1780R-Series Service Manual 3–59 edge of the /Sample RO from the Readout State Machine. U560B drives the V ertical Output Amplifiers of the CR T s; R555 (V Shape) is a gain control. U560C and D, which are also driven by the sample-and-hold output, provide an increase in drive to the Z-Axis Amplifier when readout segments or cu[...]

Theory of Operation 3–60 1780R-Series Service Manual Diagram 21 Interconnect All inputs to and outputs from the MPU circuit board are through the Intercon- nect. There are two connectors on the MPU Interconnect, one that ties into the 1780R-Series main Interconnect circuit board, and one that serves as the I/O for the MPU Annex board. A transceiv[...]

Theory of Operation 1780R-Series Service Manual 3–61 Enable (/ANDBE) controls communication with the circuitry on the Annex circuit board. Address Latch. U101 is a tri-state device conducting A-to-B only because G is tied low and the DIR tied high. It outputs three External Addresses (EA0-EA1-EA2) used as controls on the W aveform, Oscillator , Z[...]

Theory of Operation 3–62 1780R-Series Service Manual Diagrams 22, 23, & 24 MPU Annex, Front Switch Panel, & T ouch Panel Circuits on the Annex circuit board (Diagram 22) tie the 1780R-Series data bus to the front-panel switches, touch screens, indicators, and the Optical Encoder . Data transactions to and from the Master MPU are through a[...]

Theory of Operation 1780R-Series Service Manual 3–63 MPU enables U437, Read (RD) enables the buffers to read from the bus, and W rite (WR) enables the buffers to write to the bus. RL0-RL7 are data inputs from the Front Switch Panel (Diagram 23) and T ouch Panel (Diagram 24). SL0-SL3, OA0-OA3, and OB0-OB3 are outputs to the Front Switch Panel (Dia[...]

Theory of Operation 3–64 1780R-Series Service Manual Rotary Encoder / Decoder . U441 is the decoder for the optical rotary encoder on the touch panel. U441 compares the current inputs to CHA and CHB to the previous reading and, if there is a difference, starts an up/down binary counter . The counter output is transferred to an output register for[...]

Theory of Operation 1780R-Series Service Manual 3–65 Diagram 25 V ectorscope Input & Gain The Data Latches decode the V ectorscope operating instructions from the Master MPU. T wo of the circuits controlled by these instructions, Chroma Amp and T est Circle Oscillator , appear on this schematic. The T est Circle Oscillator is a crystal-contro[...]

Theory of Operation 3–66 1780R-Series Service Manual Chroma Amp. U486D is one section of a dual-in-line package (DIP) of switches that closes on a low control input (pin 16) and opens on a high. When the switch is open, Q573 turns on and parallels R566 with a network made up of C570, R571, and R568 to lower the Gain Cell gain by 25%. Lowering the[...]

Theory of Operation 1780R-Series Service Manual 3–67 Diagram 26 Diff Phase/Gain The Differential Gain and Phase Demodulators change a subcarrier rate signal into DC currents proportional to chroma amplitude (gain) and phase. The resultant current is limited (to prevent driving down-stream amplifiers into limit), filtered (to get rid of high frequ[...]

Theory of Operation 3–68 1780R-Series Service Manual The DP Zero adjustment, C172, provides a small amount of delay to the switching signal in order to have the demodulator timed to the R-Y Demodulator (Diagram 28). Differential Gain Demodulator . U261 is a balanced demodulator used as an envelope detector that multiplies the input chroma by itse[...]

Theory of Operation 1780R-Series Service Manual 3–69 for a DC level of 1 volt, with no chroma, to accommodate the Recursive Filter (Diagram 35). Demodulator Switching. U386A and B control the selection of the demodulators. For either dG or dP the Preset and Clear for U386B controls the selection of the demodulators. When dP is selected it is high[...]

Theory of Operation 3–70 1780R-Series Service Manual Diagram 27 V ector Timing & Blanking The V ectorscope display selection, chroma clamp, center dot clamp, and SCH blanking signals for the V ectorscope are generated by the V ector T iming circuits. In addition, the switching of the SCH and V ectorscope chrominance signals occurs on this sch[...]

Theory of Operation 1780R-Series Service Manual 3–71 The input H sync pulse width, which is regenerated, is approximately a half line in duration. In order to provide a uniform duration, usable H sync is shaped by a monostable pulse shaper . Its output is supplied to the Differential Gain and Phase circuits as well as to the Blanking Logic. The C[...]

Theory of Operation 3–72 1780R-Series Service Manual deflected away from the center , one or two of the comparators will drive a summing point, at the emitter of Q323 (a common base amplifier) and turn it on. When Q323 turns on, its collector goes low to disable U327C. Whenever there is no deflection and the display is centered, Q323 is turned of[...]

Theory of Operation 1780R-Series Service Manual 3–73 Diagram 28 Demodulators Chrominance from the Gain Cell is clamped to 0 volts. The V ertical and Horizontal Center Dot Clamps provide a fixed bias level to the demodulators when the Chroma Clamp forces the signal input to 0 volts. The V ertical Demodulator (R-Y or U) uses the QFSC signal from th[...]

Theory of Operation 3–74 1780R-Series Service Manual al transconductance amplifiers used in sample-and-hold circuits. The demodu- lated chrominance that is fed back drives the negative input; the positive input is driven by a Position control DC reference voltage (from the Master MPU). At the middle of horizontal sync a P AL (located on Diagram 2[...]

Theory of Operation 1780R-Series Service Manual 3–75 Diagram 29 XY Inputs & PIX Monitor Picture monitor sweeps and XY input signals drive the Deflection Amplifiers through switching circuits on the Deflection Amplifier schematic diagram. The Sweep Generators have sufficient gain range to accommodate either 525/60 or 625/50 scanning rates. The[...]

Theory of Operation 3–76 1780R-Series Service Manual XY Input Amplifiers. U21 1 is a quad, J-FET input operational amplifier . U211A and C are balanced Differential Input Amplifiers intended for audio use. In a 600 W system, R1 13 and R308 can be adjusted to normalize signals from 0 dBm to +12 dBm (2 -9 volts p-to-p). The input impedance is great[...]

Theory of Operation 1780R-Series Service Manual 3–77 Diagram 30 V ector Deflection Amps Demodulated R-Y (V) and B-Y (U) is amplified and input to a switching circuit controlled by the Master MPU acting on front-panel switch selections. When V ector or SCH display is selected, the Demodulated R-Y (V) is input to the V ertical Deflection Amplifier,[...]

Theory of Operation 3–78 1780R-Series Service Manual Horizontal and vertical readout (from the MPU), X and Y output, and picture monitor sweeps are input directly to the switching circuit for display on the V ectorscope CR T . Input signal switching to the Deflection Amplifiers is Master MPU controlled in response to front-panel switching and tou[...]

Theory of Operation 1780R-Series Service Manual 3–79 Deflection Amplifiers. The amplifiers are nearly identical. The V ertical Amplifier , which has VHF Compensation (C614), consists of Q61 1 and Q617 (a differential pair) and Q710 and Q719 (grounded base amplifiers) that speed up the amplifier by minimizing the Miller capacitance of Q61 1 and Q6[...]

Theory of Operation 3–80 1780R-Series Service Manual Diagram 31 Subcarrier Regenerator The Reference V ideo signal from the W aveform Monitor Reference switch (Diagram 4) is buffered and bandpass filtered before being mixed with the V oltage-Controlled Crystal Oscillator (VCXO) output to produce a control signal for the VCXO. In addition, the ban[...]

Theory of Operation 1780R-Series Service Manual 3–81 provide a TTL pulse at F SC to the Digital Phase Shifter and the comparison input of the Mixer stage. The External CW loop-through input is buffered, to common mode out ground currents, and bandpass filtered. The filtered output is converted to TTL pulses, for the Digital Phase Shifter , by a s[...]

Theory of Operation 3–82 1780R-Series Service Manual present on the sync backporch. This effectively locks out black and white signals or the vertical interval, where there is backporch but no burst. U383B is one half of a dual comparator that samples the output of the Mixer stage low-pass filter . Its output is low for phase lock and pulses high[...]

Theory of Operation 1780R-Series Service Manual 3–83 C394 is lowered ≈ 1/3 for P AL instruments. U397 is a strobe-controlled complementary output comparator . U397 provides TTL outputs, at External CW frequency , to the Input Switch, U469, from the bandpass filtered EXT CW signal. The strobe signal is disabled in EXT CW . It is also used to tur[...]

Theory of Operation 3–84 1780R-Series Service Manual Diagram 32 Digital Phase Shifter The Digital Phase Shifter uses the input subcarrier frequency to generate an intermediate and somewhat lower subcarrier frequency . The intermediate subcarrier , which is divided into 7200 parts, is used to load a Microprocessor- generated count into a programma[...]

Theory of Operation 1780R-Series Service Manual 3–85 In addition, the divided by 7200 F SC ’ produces the counter load pulse for a Programmable Divide by 7200 Counter that outputs the reference phase to the Phase Detector in the output phase-lock loop. The output phase-lock loop mixes the F SC ’ signal with the output of a second VCXO to prod[...]

Theory of Operation 3–86 1780R-Series Service Manual U338. RCO from U342 is the counter load for the programmable counter ( ÷ M and ÷ N). The input register for the programmable counter (U235 and U238) is loaded with a count from the Microprocessor Data Bus. This count is in the form of two 8-bit words. The word consisting of the 8 least signif[...]

Theory of Operation 1780R-Series Service Manual 3–87 Diagram 33 Horizontal AFC & Post Regulators REF SYNC, originating from the H Sync Generator on Diagram <9>, is compared to the H rate sync divided down from the VCO by a Phase Detector . If they are not phase locked, the Error Amplifier output will be high and cause the Acquisition Sw[...]

Theory of Operation 3–88 1780R-Series Service Manual up, the output of the Phase Detector falls below the trigger threshold of the unijunction-wired Acquisition Sweep (Q41 1 and Q412), to turn off the ramp. If the loop unlocks, the output of the Phase Detector (through the Error Amplifier) goes above the Acquisition Sweep threshold and the ramp i[...]

Theory of Operation 1780R-Series Service Manual 3–89 Diagram 34 Diff Gain/Phase Alt Mode Switch The 1780R-Series offers a choice of either single display mode or a double display mode that can be nulled. The Alternate, or double mode, is switched about itself to display a mirror image. Sources of chroma for the mode switch are either directly fro[...]

Theory of Operation 3–90 1780R-Series Service Manual Diff Gain/Phase Alternate Mode Switch. U425 implements a Switchable Polarity Amplifier , which outputs a differential current. Pin 4 is the signal input; transconductance gain is set by R422. The pin 6 output drives the + input of a Differential Operational Amplifier and pin 12 drives the – i[...]

Theory of Operation 1780R-Series Service Manual 3–91 Diagram 35 Digital Recursive Filter The Digital Recursive Filter reduces the noise content of differential phase and differential gain signals without impacting the spectral response below 500 kHz by reinforcing the harmonic frequencies that are multiples of line rate. The video line is broken [...]

Theory of Operation 3–92 1780R-Series Service Manual The D/A Converter latches data off the M Data Bus at the same time that the Adder data is loaded into the Filter Latch. The analog signal is output to a low-pass output filter to remove sampling artifacts above approximately 750 kHz. The Address Counter output A6 is the clock for the Memory W r[...]

Theory of Operation 1780R-Series Service Manual 3–93 Storage. The data stored in Static Random Access Memory (U251 and U260) is from the conversion of the previously-sampled video line and is at the same point that the A/D Converter is outputting from the current line. During the read operation, the 12-bit Memory data is on the M Data Bus and is [...]

Theory of Operation 3–94 1780R-Series Service Manual U400B is clocked by U261 when either /RD or /WR goes low while /Fltr Brd is low . An Exclusive OR gate internal to U261 outputs the INC pulse and increments the Address Counter . Incrementing the Address Counter toggles the A0 (U271-14) output, which is the other input to the U261 Exclusive OR [...]

Theory of Operation 1780R-Series Service Manual 3–95 Diagram 36 Z-Axis The W aveform and V ectorscope Z-Axis circuits act on blanking/unblanking signals from several sources to control the intensity of the CR T displays. Intensity control signals for both active display and readout are independently input to the Z-Axis circuits. The W aveform Z-A[...]

Theory of Operation 3–96 1780R-Series Service Manual from the vector intensity current source, U383C. V ector intensity is blanked if any one of the inputs to U289A is low . U486D steers current from the readout intensity current source, U486C. The display is blanked when no current is diverted into the output, which drives the V ectorscope Z-Axi[...]

Theory of Operation 1780R-Series Service Manual 3–97 Diagrams 37 & 38 Timing Cursors & Counters The timing cursors for the 1780R-Series are narrow bright-up pulses applied to the CR T cathode. They can be moved independently in 5-nanosecond intervals. The Microprocessor keeps track of the time difference between the two timing cursors and[...]

Theory of Operation 3–98 1780R-Series Service Manual will not start quickly at sync pulse time to be synchronous with the sweep. An LC Oscillator is used and calibrated to a crystal frequency reference during the vertical interval. At Reference calibration time the Freq Cal T imer circuit generates a Frequency Cal pulse that connects the Error Am[...]

Theory of Operation 1780R-Series Service Manual 3–99 Sample-and-Hold. During the time that the LC Oscillator is being checked against the 10 MHz Reference, U406A is closed and U406B is open; during the time that timing cursor information is being output, the switches are in the opposite configuration. W ith C403 paralleling C404, and the loop fil[...]

Theory of Operation 3–100 1780R-Series Service Manual The output from U429B drives U223B, which enables the Digital Delay Counters. U429B and U223B are both cleared with the /RAMP ST AR T signal, which becomes true at the end of the digital count from the delay counters. The remaining outputs from U426 are described as follows: LINE SEL PHASE: Pr[...]

Theory of Operation 1780R-Series Service Manual 3–101 information. This delay information is loaded into the three counters, U333, U336, and U339. At any given time, only one cursor delay can be active; Cursor 1 and Cursor 2 time share at a 30 Hz rate. Cursor 1 and Cursor 2 delays are selected by a clock steering decoder , U329, which latches dat[...]

Theory of Operation 3–102 1780R-Series Service Manual Diagram 39 CRT Display DAC The CR T Display DAC decodes digital information from the Microprocessor Data Bus to drive 16 analog control voltage outputs. This digital information is the current setting of front-panel controls, such as Focus and Intensity levels, and some menu driven (Measuremen[...]

Theory of Operation 1780R-Series Service Manual 3–103 Analog Multiplexers. U346 and U348 are Analog Multiplexers. Each has one input and eight outputs; the input is the analog signal level from the DAC. The outputs are normally high impedance disconnects, except when one is selected by the digital word at inputs A, B, and C. U248 is a latch that [...]

Theory of Operation 3–104 1780R-Series Service Manual Diagrams 40 & 45 Scale Illum & T race Rotation – Graticule Lights A T riangle Generator is employed to provide a triangular waveform to drive one input of the Pulse W idth Modulators. Pulse W idth Modulators are voltage comparators that compare the triangle-shaped waveform to DC volt[...]

Theory of Operation 1780R-Series Service Manual 3–105 Rotation Drivers. The Rotation Drivers are simple push-pull, discrete transistor , emitter followers. Each driver consists of a pnp and npn transistor pair (Q377 & Q378, Q374 & Q375) between –15 volts and +15 volts. Their outputs drive the T race Rotation coils around the V ectorscop[...]

Theory of Operation 3–106 1780R-Series Service Manual S130 is a push-button switch with an LED that is directly beneath the W aveform CR T . It assigns Focus, Intensity , Scale Illum, and Position controls to the W aveform Monitor .[...]

Theory of Operation 1780R-Series Service Manual 3–107 Diagram 41 V ector High V olts The W aveform Monitor high voltage supply generates all of the potentials required to power the CR T , except for the deflection voltages. The high voltage is derived from an Armstrong Oscillator-generated 33-kHz signal. The Error Amplifier , which controls oscil[...]

Theory of Operation 3–108 1780R-Series Service Manual C130 provides a low impedance current path for the base drive winding of T240. R222 limits Q221 base current. Power Supplies. CR151 is a potted assembly of diodes and capacitors which provides a DC output equal to four times the peak input voltage. The output provides +1 1K volts DC post accel[...]

Theory of Operation 1780R-Series Service Manual 3–109 Focus Amp. The Focus Amp consists of Q380 and Q381 with R379 as the input resistor and R382 as the feedback resistor . Coarse focus is adjusted with R182, which is located at the Focus divider resistor string. The amplifier output varies between 0 and –250 volts. Line Select Focus. When the [...]

Theory of Operation 3–1 10 1780R-Series Service Manual Diagram 42 W aveform High V olts The W aveform Monitor high voltage supply generates all of the potentials required to power the CR T , except for the deflection voltages (however , +160 volts for the Horizontal Deflection Amplifier is generated by these circuits). The high voltage is derived[...]

Theory of Operation 1780R-Series Service Manual 3–1 1 1 Osc. Q300 is the active element of an Armstrong Oscillator , with C410 and the primary of T210 resonating at 25 kHz. L200 and C100 filter the 25-kHz signal out of the +60 volt supply . C500 provides a low impedance current path for the base drive winding of T250. C300 prevents parasitic osci[...]

Theory of Operation 3–1 12 1780R-Series Service Manual Grid Drive Rectifier . Z-axis high frequency information is fed to the CR T control grid through C240. Low frequency information is through C241. The Grid Drive Rectifier , consisting of CR140 and CR141, is a voltage doubler that converts peak-to-peak voltage from the PP Clamp to DC. When the[...]

Theory of Operation 1780R-Series Service Manual 3–1 13 Diagram 43 Low V oltage Power Supply The low voltage power supply is a line operated switcher , of the discontinuous flyback type, running at 40 kHz. The switching transistor saturates, placing the primary voltage across the primary winding. Due to the inductance of the primary winding, curre[...]

Theory of Operation 3–1 14 1780R-Series Service Manual The primary side of the circuit is not referenced to chassis ground and typically , the line common rides at – 150 volts, unless an isolation transformer is used. An isolation transformer between the instrument and the mains power will let the line side common float, which will allow the li[...]

Theory of Operation 1780R-Series Service Manual 3–1 15 R140, and C240, which protects Q250 from over-voltage. C240 and CR141 arrest the voltage spike on the flyback pulse at a safe level (approximately 650 to 700 volts). L240 and R140 limit the rise time of the current pulse in C240, quieting the noise spike. C240 discharges each cycle, through C[...]

Theory of Operation 3–1 16 1780R-Series Service Manual Pin 1 of U460 is the Error Amplifier output. Pin 2 is the minus input to the Error Amplifier , the positive terminal is internally connected to +2.5 volts. Pin 3 is the current sense input, and pin 6 is the controller output, driving the base drive circuit. The Current Mode Controller has an [...]

Theory of Operation 1780R-Series Service Manual 3–1 17 Output Filters. The filters are all the standard pi configuration except the –8 volt filter . There are three powdered iron beads (L420, L421, and L422) on the +5 volt secondary wires to help raise the other output voltages to the proper values. Error Amp. U131 is a shunt regulator supplyin[...]

Theory of Operation 3–1 18 1780R-Series Service Manual[...]

[...]

1780R-Series Service Manual 4–1 Performance V erification This section consists of the Performance Check, used to determine compliance with the Performance Requirements listed in the Specifications section. Controls and connectors on the 1780R-Series front panel and rear panel are fully capitalized (e.g., RIGHT DISPLA Y -WFM). Control and connect[...]

Performance V erification 4–2 1780R-Series Service Manual T able 4–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements NOTE: The 1410 Series generators with standard SPG and TSG modules can be used, but this will not allow all checks and adjustments to be made. The 1410 and 141 1 Option AB are mainframes with[...]

Performance V erification 1780R-Series Service Manual 4–3 T able 4–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements 9. Video Amplitude Calibration Fixture Signal; adjustable square wave 0.0 to 999.9 mV p-p with a resolution of 0.1 mV and an accuracy of 0.05%, frequency approximately 270 Hz. TEKTRONIX 067-0[...]

Performance V erification 4–4 1780R-Series Service Manual T able 4–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements 21. X Y Input Connector Fifteen-pin, subminiature D-type connec- tor modified to input the audio signal for X Y checks and adjustments. See Figure 4–2. T ektronix Part No. 131-0459-00. 22. [...]

Performance V erification 1780R-Series Service Manual 4–5 Figure 4–2: Rear view of the X Y plug connections. (Pins 2, 4, 6, 10, 12, and 14 can be used to make ground connections.) Figure 4–3: REMOTE connector modified for Remote Sync input[...]

Performance V erification 4–6 1780R-Series Service Manual Figure 4–4: RGB Parade Display T est Connector[...]

Performance V erification 1780R-Series Service Manual 4–7 Short Form Procedure The Short Form Performance Check is provided for those familiar with the complete check procedure, and the Standard Performance Check Procedure is provided for those who need more detailed instructions. Both forms of the performance check procedure use the same step nu[...]

Performance V erification 4–8 1780R-Series Service Manual 23. Check V ertical Overscan 24. Check DC Restorer Shift V ersus Burst 25. Check Filter DC Matching 26. Check Common Mode Rejection 27. Check Differentiated Steps 28. Check Non-Linear W aveform Distortion 29. Check Linear W aveform Distortion 30. Check Probe Input Gain 31. Check Calibrator[...]

Performance V erification 1780R-Series Service Manual 4–9 51. Check V ector Display Clamp Stability and Position Range 52. Check V ector Display V ariable Gain Range 53. Check V ariable Gain Phase Shift 54. Check X and Y Input Phase Matching 55. Check X Y Frequency Response 56. Check SCH Phase Accuracy 57. Check WFM T race Rotation and Orthogonal[...]

Performance V erification 4–10 1780R-Series Service Manual Performance Check Procedure This Performance Check Procedure is a continuous sequential procedure. If a step is performed out of sequence, pertinent control settings are given within the step. Remaining control settings can be determined by referring to T able 4–2; however , sometimes i[...]

Performance V erification 1780R-Series Service Manual 4–1 1 NOTE . Leave the 1780R-Series internal jumpers in their factory-set positions unless dir ected otherwise. The factory-set positions are listed in Section 2, Installation, Electrical. Install the metal cover on the instrument and leave it installed when following this pr ocedure to check [...]

Performance V erification 4–12 1780R-Series Service Manual H Set the 1780R-Series front-panel controls and Configure menu selection to the settings given in T able 4–2. Adjust the controls for best viewing of the display . 1. Check Power Supply Operation Requir ement: . Check AC input range, 90–132 V or 200–250 V , as deter- mined by the li[...]

Performance V erification 1780R-Series Service Manual 4–13 b. Set the V AC output amplitude to 999.9 mV . Check that the +Lum button is pressed in and the Lum/Sync button is out. Check that the correct television standard (NTSC, P AL, or P ALM) is selected. NOTE . Leave the V AC +Lum and Lum/Sync buttons and television standar d set as described [...]

Performance V erification 4–14 1780R-Series Service Manual i. Check that the CAL readout on the W aveform CR T is 1000 mV ± 2 mV . j. Set the W A VEFORM GAIN–V AR–X5 to Off. Set the INPUT to CH A. Leave the RIGHT DISPLA Y set to WFM+CAL, the CONFIGURE button set to On, and the V AR/FIX selection set to V AR on the W aveform CR T menu when st[...]

Performance V erification 1780R-Series Service Manual 4–15 b. Select W A VEFORM GAIN–V AR. Check that RIGHT DISPLA Y–WFM and INPUT–CH A are selected. c. Use the VER T POS control to position the waveform backporch or blanking level to the graticule 0 IRE graticule line for NTSC (0.3 V for P AL) on the W aveform CR T . d. T urn the variable [...]

Performance V erification 4–16 1780R-Series Service Manual Figure 4–7: Identification of marks and divisions on the graticule baseline[...]

Performance V erification 1780R-Series Service Manual 4–17 6. Check V oltage Cursor Accuracy Requir ement: Accuracy: ± 0.2%. Resolution: 1 mV . a. W ith no signal applied to CH A INPUT , set the front-panel controls and menu selection as follows: RIGHT DISPLA Y–WFM+CAL, WFM HORIZONT AL–ONE–LINE, VOL T AGE CURSORS–On (ABSOLUTE, SEP ARA TE[...]

Performance V erification 4–18 1780R-Series Service Manual d. Connect a coaxial cable from the 1780R-Series AUX OUT connector , through a precision (0.2%) 75 W feed-through terminator , to Ch 1 Input on the test oscilloscope. NOTE . The pr ecision terminator is listed under Auxiliary Equipment. It is also supplied with the Return Loss Bridge. e. [...]

Performance V erification 1780R-Series Service Manual 4–19 l. Remove the four terminators used in part b. of this step and the coaxial cable from the AUX OUT connector to the test oscilloscope. 9. Check Noise Measurements Requir ement: Accuracy: T o 56 dB within 1 dB; 60 dB within 2 dB. a. Connect the V AC to the 1780R-Series CH B1 INPUT connecto[...]

Performance V erification 4–20 1780R-Series Service Manual 1 to 1 ± 0.005 (0.995 to 1.005). Ch A Input to Picture Monitor Output: 1 to 1 ± 0.02 (0.98 to 1.02). a. Connect the V AC output to the 1780R-Series CH A INPUT connector . Do not terminate. Check that the Black Burst signal is applied to the EXT REF connector . b. Check that the V AC out[...]

Performance V erification 1780R-Series Service Manual 4–21 r. Move the V AC output signal from the CH B3 INPUT to the CH A INPUT . Connect a coaxial cable from the CH A INPUT loop-through connector to the +Input of the test oscilloscope Differential Comparator . s. Connect another coaxial cable from the PIX MON OUT connector , through a precision[...]

Performance V erification 4–22 1780R-Series Service Manual ae. Select RELA TIVE on the V ectorscope CR T menu. Press the REF- ERENCE SET button. Note that the D V readout is 100.0% on the W aveform CR T . af. Move the coaxial cable with the 50 W -to-75 W minimum loss attenuator from the CH A INPUT connector to the AUX IN connector . (Check that t[...]

Performance V erification 1780R-Series Service Manual 4–23 Figure 4–8: T est equipment connections for checking CH A frequency response NOTE . Leave the termination connected to the PIX MON OUT connector for steps 1 1 thr ough 15 unless dir ected otherwise. e. Check that the controls are set as follows: RIGHT DISPLA Y–WFM, INPUT–CH A, REF?[...]

Performance V erification 4–24 1780R-Series Service Manual k. Check set the generator to each of the following frequencies: 3.58 MHz (4.43 MHz for P AL), 5 MHz, 8 MHz, and 10 MHz. Use parts i. and j. as a guide for checking the frequency response at each given frequency . l. Set the generator frequency to 15 MHz. Set the generator output amplitud[...]

Performance V erification 1780R-Series Service Manual 4–25 a. Connect the leveled sine wave generator output, through a 50 W -to-75 W minimum loss attenuator , to the CH B2 INPUT connector . Do not terminate the loop-through connector . b. Select INPUT–CH B2. c. Check repeat step 1 1b. through 11p. to check the frequency response of the 1780R-S[...]

Performance V erification 4–26 1780R-Series Service Manual c. Set the generator output frequency to 50 kHz (reference). Set the generator output amplitude so the W aveform CR T display is exactly 714 mV or 100 IRE for NTSC (or 700 mV for P AL) in amplitude. d. Set the generator output frequency to 1 MHz. e. Check that the W aveform CR T display a[...]

Performance V erification 1780R-Series Service Manual 4–27 Figure 4–9: Connections for checking AUX OUT frequency response. (Only Ch 1 of the test oscilloscope dual-trace unit is used.) g. Set the generator to each of these frequencies: 3.58 MHz (4.43 MHz for P AL), 5 MHz, 8 MHz, and 10 MHz. h. Check the response for each frequency given in par[...]

Performance V erification 4–28 1780R-Series Service Manual b. Select INPUT–PROBE and WFM HORIZONT AL ONE–FIELD mode of operation. Check that PROBE–X1 is selected on P AGE 2 of the Configure menu. c. Set the generator output frequency to 50 kHz (reference). Set the generator output amplitude so the display on the W aveform CR T is exactly 71[...]

Performance V erification 1780R-Series Service Manual 4–29 19. Check Lum/Chroma Gain Ratio Requir ement: X1 Gain Ratio: 1:1 ± 1%; X5 Gain Ratio: ± 0.5%. a. Connect a modulated 2T Pulse & Bar signal (12.5T NTSC, 10T P AL) from a T elevision T est Signal Generator through a 75 W feed-through terminator to the 1780R-Series CH A INPUT connector[...]

Performance V erification 4–30 1780R-Series Service Manual c. Set the generator frequency to 50 kHz (reference). Set the generator output amplitude so the waveform CR T display is exactly 714 mV or 100 IRE in amplitude for NTSC (700 mV for P AL). d. Select FIL TER–LUM mode. e. Check that the displayed amplitude is between 707 mV and 721 mV or 9[...]

Performance V erification 1780R-Series Service Manual 4–31 x. Check that the displayed amplitude is equal to or greater than 500 mV or 70 IRE for NTSC (490 mV for P AL). y. Set the generator frequency to 2.68 MHz (3.53 MHz for P AL). z. Check that the displayed amplitude is equal to or less than 500 mV or 70 IRE for NTSC (490 mV for P AL). aa. Se[...]

Performance V erification 4–32 1780R-Series Service Manual k. Check that the signal blanking level moves less than 3 IRE for NTSC (21 mV for P AL). l. Move the coaxial cable with its terminator from the CH A INPUT connector to the CH B1 INPUT connector . Select INPUT–CH B1 on the right front panel. m. Check Repeat parts c. through k. of this st[...]

Performance V erification 1780R-Series Service Manual 4–33 c. Set the 1780R-Series WFM HORIZONT AL buttons to TWO–LINE. d. Press the CONFIGURE button to On. Check that COUPLING–DC and DC RESTORER–OFF are selected on the Configure menu. e. Set the sine wave oscillator amplitude control so that the display on the W aveform CR T is 100 IRE for[...]

Performance V erification 4–34 1780R-Series Service Manual b. Set the generator Luminance button to On (pressed in). c. Set the 1780R-Series controls as follows: INPUT to CH A, WFM HORIZONT AL to ONE–LINE, MAGNIFIER to 1.0 m s/DIV , and W A VEFORM GAIN to X5. d. Use the VER T POS control to move the signal baseline between the –40 IRE and +10[...]

Performance V erification 1780R-Series Service Manual 4–35 25. Check Filter DC Matching Supplemental: (not listed in Section 2); Matching: W ithin 10 IRE for NTSC (70 mV for P AL). a. Check that a Pulse & Bar signal is applied to the 1780R-Series CH A INPUT connector . b. Set the 1780R-Series controls as follows: Select WFM HORIZONT AL– THR[...]

Performance V erification 4–36 1780R-Series Service Manual e. Set the 1780R-Series controls as follows: INPUT to AB1 and W A VE- FORM GAIN to X5. f. Check that the amplitude is 3.5 IRE or less for NTSC (25 mV for NTSC or P AL) as displayed on the W aveform CR T . g. Set the sine wave oscillator frequency to 15 kHz. Select INPUT–CH A and set the[...]

Performance V erification 1780R-Series Service Manual 4–37 button to CH B1 when setting the display reference amplitude and then select INPUT B1B3 to check common mode rejection). u. Disconnect the dual-input coupler and the sine wave signal from the instrument. 27. Check Differentiated Steps Requir ement: Step Attenuation: ≥ 40 dB, 3.58 MHz, o[...]

Performance V erification 4–38 1780R-Series Service Manual a. Check that a 5-Step, 40 IRE Modulated Staircase signal is applied to the 1780R-Series CH A INPUT connector . For P AL, use a 280 mV Modulated Linearity signal. b. Connect a coaxial cable from the AUX OUT connector of the 1780R-Se- ries instrument under test to the Ch A Input of a test [...]

Performance V erification 1780R-Series Service Manual 4–39 d. Check that the 2T pulse amplitude is 1 IRE or less for NTSC (7 mV for P AL) than the 2T bar amplitude. e. Check that the 2T bar tilts 1 IRE or less for NTSC (7 mV for P AL). f. Change the generator output signal to Field Square W ave. Select WFM HORIZONT AL–ONE–FIELD mode on the 17[...]

Performance V erification 4–40 1780R-Series Service Manual l. Disconnect the V AC signal from the PROBE input connector . 31. Check Calibrator Output V oltage for Probe Requir ement: CAL OUT V oltage: 1.0 V ± 0.5%. a. Connect the BNC connector end of a 1X probe to the 1780R-Series PROBE input connector . b. Connect the probe tip through a BNC to[...]

Performance V erification 1780R-Series Service Manual 4–41 32. Check Probe T ilt and Non-Linear Distortion Requir ement: Tilt: Less than 5% on a 50 Hz square wave (less than 4% when using a 60 Hz square wave). a. Apply a Field Square W ave from the Pulse & Bar module of the television test signal generator , through a 75 W feed-through termin[...]

Performance V erification 4–42 1780R-Series Service Manual h. Select CURSOR 1 on the W aveform CR T . i. T urn the Precision Measurement knob so that CURSOR 1 bright-up spot overlays CURSOR 2 bright-up spot. j. Check that the D T readout on the W aveform CR T is between 63.550 m s and 63.560 m s. (The readout for P AL should be between 63.995 m s[...]

Performance V erification 1780R-Series Service Manual 4–43 c. Use the 1780R-Series VER T POS and HORIZ POS controls to position the trace on the graticule baseline so that it starts at the first major graticule mark (located at the start or left end of the baseline) on the W aveform CR T . The graticule baseline is 0 IRE for NTSC; 0.3 V for PA L [...]

Performance V erification 4–44 1780R-Series Service Manual n. Set the TIME CURSORS button to Off and the MAGNIFIER to OFF . 35. Check V ariable Sweep Range Requir ement: Range: > ± 20%. a. Connect the television test signal generator Color Bar signal through a 75 W feed-through terminator to the 1780R-Series CH A INPUT connector . b. Set the [...]

Performance V erification 1780R-Series Service Manual 4–45 c. Rotate the Precision Measurement control to select Line 263 for the 1780R NTSC instrument. For P AL, go to parts e. and f. d. Check that there is a one-half color display line located on the left side of the W aveform CR T screen. Check that there is no Color Bar signal displayed on th[...]

Performance V erification 4–46 1780R-Series Service Manual h. Connect the output of the function generator to the test oscilloscope vertical amplifier input. Set the generator controls for 0 V to +10 V square waves as displayed on the test oscilloscope CR T . i. Disconnect the function generator output signal from the test oscillo- scope. Connect[...]

Performance V erification 1780R-Series Service Manual 4–47 c. Check and/or set the 1780R-Series controls as follows: LEFT DIS- PLA Y–VECT , RIGHT DISPLA Y–WFM, REF–EXT , and WFM HORIZONT AL ONE–LINE. d. Press the MEASURE button to On. Select DIFF GAIN, SINGLE, and NOISE REDUCTION–OFF on the V ectorscope CR T menu. e. Check that the VECT[...]

Performance V erification 4–48 1780R-Series Service Manual t. Select SINGLE and NOISE REDUCTION–OFF on the V ectorscope CR T menu. Press the MEASURE button to exit the menu. u. Leave the 5-Step Staircase signal connected to CH A INPUT . 40. Check Differential Phase Requir ement: Deflection Factor: 5 _ dP deflects the trace 50 IRE (NTSC) or 500 [...]

Performance V erification 1780R-Series Service Manual 4–49 o. Leave the MEASURE button set to On. p. Leave the 5-Step Staircase test signal from the CH A INPUT connector . 41. Check Recursive Filter SUPPLEMENT Approximately 15 dB signal-to-noise reduction with filter selected. a. Check that a Modulated 5-Step Staircase signal from the television [...]

Performance V erification 4–50 1780R-Series Service Manual e. Set the television test signal generator V ariable Sync to On. Adjust the V ariable Sync control to obtain minimum output amplitude (14 dB reduction; i.e., <8 IRE amplitude for NTSC; <57 mV for P AL). f. Check that the W aveform CR T display is locked. g. Set the test signal gene[...]

Performance V erification 1780R-Series Service Manual 4–51 a. Check that the television test signal generator Color Bar signal is applied to the 1780R-Series CH A INPUT connector . Check that the generator Black Burst signal is applied to the EXT REF connector and this connector is terminated into 75 W . b. Check and/or set the 1780R-Series contr[...]

Performance V erification 4–52 1780R-Series Service Manual b. Select REF–INT on the 1780R-Series front panel. Adjust the generator Linearity Rate control so the signal bounce rate is approximately two seconds. c. Set the 1780R-Series V AR/SLOW button to SLOW . Press the CON- FIGURE button to On and select the P AGE 3 menu. Check that SLOW SWEEP[...]

Performance V erification 1780R-Series Service Manual 4–53 e. Disconnect the Remote Sync Input Connector from the instrument. Leave the Color Bar signal connected to CH A INPUT . 47. Check Digital Phase Shifter Requir ement: Phase Accuracy: 0.1 _ . a. Check that a television test signal generator Color Bar signal is applied through a 75 W feed-th[...]

Performance V erification 4–54 1780R-Series Service Manual o. T urn the Subcarrier dial on the television test signal generator to place the red vector dot on the 210 _ graticule line on the 1780R-Series V ectorscope CR T . T urn the 1780R-Series Precision Measurement control to reposition the red vector dot back to the 180 _ graticule line. p. C[...]

Performance V erification 1780R-Series Service Manual 4–55 Figure 4–10: V ector graticule showing the –3 dB points for checking frequency response f. Set the generator output frequency to 2.979545 MHz for NTSC (3.833619 MHz for P AL). g. Check that the circle displayed on the V ectorscope CR T is smaller than the 3 dB marks. h. Set the genera[...]

Performance V erification 4–56 1780R-Series Service Manual d. Check that the color vector dots are located within 50% of the distance between the center of the boxes and edges of the boxes. e. Check that the button under the V ectorscope CR T is On. Press the CALIBRA TE button and select the CAL OSC–ON pad on the W aveform CR T . f. Check that [...]

Performance V erification 1780R-Series Service Manual 4–57 f. Set the test oscilloscope dual trace amplifier controls as follows: Ch 1 V olts/Div to 0.1 V , Input Coupling to DC, Display Mode to Ch 1, and the T rigger Source to Ch 1. Set the Time Base controls as follows: Mode to Auto, Coupling to DC, Source to Int, and the T ime/ Div to 1 m s. g[...]

Performance V erification 4–58 1780R-Series Service Manual v. Move the Color Bar signal to the CH B3 INPUT connector and terminate into 75 W . Select INPUT–CH B3. w. Check Use parts p. through s. as a guide for checking CH B3. x. Set the VECTOR GAIN–V AR to Of f. y. Leave the Color Bar signal connected to the CH A INPUT connector . 51. Check [...]

Performance V erification 1780R-Series Service Manual 4–59 d. Set the 1780R-Series VECTOR GAIN to V AR. T urn the variable VECTOR GAIN control counterclockwise until the circle is its smallest size. e. Note the amplitude of the display on the W aveform CR T . f. Set the generator output amplitude so that it is twice the amplitude noted in part e.[...]

Performance V erification 4–60 1780R-Series Service Manual h. Adjust the variable VECTOR GAIN control so that the burst vector length reaches the 20% DG mark on the 180 _ graticule line. i. T urn the Precision Measurement control to null the burst. j. Check that the PHASE readout on the V ectorscope CR T is between +1.00 _ and –1.00 _ . k. Set [...]

Performance V erification 1780R-Series Service Manual 4–61 Figure 4–1 1: Properly adjusted xy input gains 55. Check X Y Frequency Response Requir ement: Frequency Response: DC to >500 kHz. a. Connect the leveled sine wave generator output signal to pin 3 of the 1780R-Series rear panel X Y INPUT connector . Use the X Y INPUT connector listed [...]

Performance V erification 4–62 1780R-Series Service Manual NOTE . Perform parts i. thr ough o. of this step only if the internal jumpers for A6J108 and A6J205 ar e installed to operate the instrument in the High Gain mode. i. Connect the sine wave oscillator to pin 1 1 and ground pin 9 of the X Y INPUT connector . j. Set the sine wave oscillator [...]

Performance V erification 1780R-Series Service Manual 4–63 e. Check that the SCH dot is located near the compass rose and that it is within 5 _ of the 180 _ axis for NTSC or P AL. f. Connect the Frame/Black (NTSC) or Frame Ref (P AL) signal from the television generator to the CH 1 Input to the test scope dual trace amplifier . Connect the 1780R-[...]

Performance V erification 4–64 1780R-Series Service Manual Check that the generator is internally connected so that the SCH can be varied. (Refer to P339 on the generator A21 Sync Lock board.) l. Check that by turning the generator Subcarrier Phase control clockwise, the SCH dot “flips” between 80 _ and 1 15 _ (typical range). SCH phase can b[...]

Performance V erification 1780R-Series Service Manual 4–65 e. T urn the Precision Measurement control so that the waveform blanking level is aligned parallel with the CR T graticule baseline (0 IRE for NTSC; 0.3 V for P AL). The electronic graticule horizontal line will also be parallel with its nearest CR T graticule line. f. T urn the Precision[...]

Performance V erification 4–66 1780R-Series Service Manual Figure 4–13: Setting up the Return Loss Bridge: a) setup 500 mV amplitude; b) Nulling the bridge NOTE . The Return Loss Bridge must null within 0.5 mV . If the Bridge does not null within this amplitude, the Bridge must be r ecalibrated before checking the 1780R-Series instrument r etur[...]

Performance V erification 1780R-Series Service Manual 4–67 Figure 4–14: Measuring return loss of 1780R-Series CH A INPUT f. Check that the return loss of the CH A INPUT is better than 40 dB for a frequency range from 50 kHz (reference) to 5 MHz. Make this check, within this frequency range, with instrument power on and off. (40 dB converts to 5[...]

Performance V erification 4–68 1780R-Series Service Manual[...]

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1780R-Series Service Manual 5–1 Adjustment Procedures This section of the 1780R-Series Service Manual consists of an Adjustment Procedure. The Performance V erification is used to evaluate operation of the instrument as specified in the Performance Requirements in Specifications . The Adjustment Procedure is used to return the instrument to opera[...]

Adjustment Procedures 5–2 1780R-Series Service Manual Figure 5–1: Simplified representation of the 1780R-Series Video Measurement Set, showing the location of the four control groups The Precision Measurement Control is multifunctional. Its function is assigned either by the accompanying switches or through one of the CR T displayed menus. The [...]

Adjustment Procedures 1780R-Series Service Manual 5–3 The <> switches below the Precision Measurement Control knob duplicate its function, allowing a single increment of change per push. The instrument is made up of a number of etched circuit boards. Adjustments are present on most of the boards, making it necessary to first find the circui[...]

Adjustment Procedures 5–4 1780R-Series Service Manual Recommended Equipment List T able 5–1: Recommended Equipment Electrical Instrument Performance Requirements Example Electrical Instruments 1. T est Oscilloscope V ertical Amplifier Differential Comparator with 30 MHz bandwidth and 1 mV sensitivity . Dual- T race Amplifier with 30 MHz bandwid[...]

Adjustment Procedures 1780R-Series Service Manual 5–5 T able 5–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements 5. Leveled Sine W ave Generator Flatness 1%, 250 kHz to 50 MHz. The flatness can be characterized (a chart made of variations) with the TEKTRONIX Peak-to-Peak Detector (015-0408-00). TEKTRONIX SG[...]

Adjustment Procedures 5–6 1780R-Series Service Manual T able 5–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements Auxiliary Equipment 14. 75 W T erminators Five required, three must be a feed- through type. T wo 75 W End-line T erminators (T ektronix Part No. 01 1-0102-00). Three Precision (0.2%) 75 W Feed- [...]

Adjustment Procedures 1780R-Series Service Manual 5–7 Figure 5–4: Rear view of the X Y plug connections. (Pins 2, 4, 6, 10, 12, and 14 can be used to make ground connections.) Figure 5–5: RGB Parade Display T est Connector[...]

Adjustment Procedures 5–8 1780R-Series Service Manual Adjustment List T able 5–2 lists all of the adjustments by step number sequence. This table can be used as a short form adjustment procedure for those who are familiar with the adjustment procedure for the 1780R-Series. T able 5–2: 1780R-Series Adjustments for Calibration Procedure Step # [...]

Adjustment Procedures 1780R-Series Service Manual 5–9 T able 5–2: 1780R-Series Adjustments for Calibration Procedure (Cont.) Step # Diag # Circuit Number A # Adjustment Name 14 Cal Gain A2 R1 137 5 15 (Diff Amp Accuracy) LF CMR A2 R1033 5 16 Gain B1 A8 R347 1 17 Gain B3 A8 R394 2 17 Gain B2 A8 R370 2 17 Gain A A8 R323 1 18 V ar Gain Regis A2 R5[...]

Adjustment Procedures 5–10 1780R-Series Service Manual T able 5–2: 1780R-Series Adjustments for Calibration Procedure (Cont.) Step # Diag # Circuit Number A # Adjustment Name 33 H Mag Reg A2 R344 11 34 Slow Sweep T rig Level A2 R761 13 35 Burst Lock Center Freq A7 C182 31 35 +Delta F Center Freq A7 C252 32 35 Output Center Freq A7 C452 32 35 DC[...]

Adjustment Procedures 1780R-Series Service Manual 5–1 1 T able 5–2: 1780R-Series Adjustments for Calibration Procedure (Cont.) Step # Diag # Circuit Number A # Adjustment Name 42 RGB/YRGB Staircase Offset A5 R194 19 43 (WFM) Line Select Focus A16 R350 42 43 (V ector) Line Select Focus A3 R384 41 44 Probe Comp A6 C493 3 45 (Probe) Calibrator Amp[...]

Adjustment Procedures 5–12 1780R-Series Service Manual Procedure This Adjustment Procedure is a continuous sequential procedure. If a step is performed out of sequence, pertinent control settings are given within the step. Remaining control settings can be determined by referring to T able 5–3; however , sometimes it may be necessary to go back[...]

Adjustment Procedures 1780R-Series Service Manual 5–13 1. Equipment Connections a. Connect the television test signal generator Color Bar signal, through a 75 W feed-through terminator , to the 1780R-Series CH A INPUT connector . See Figure 5–6. Figure 5–6: Initial signal connections for re-adjustment of the 1780R-Series b. Connect the televi[...]

Adjustment Procedures 5–14 1780R-Series Service Manual f. Set the PHASE SHIFT button to Off, the CALIBRA TE button to On, and the button below the V ectorscope CR T to On. g. Use the Precision Measurement control to adjust for desired V ectorscope CR T readout intensity . h. Press the button below the W aveform CR T to On. i. T urn the Precision [...]

Adjustment Procedures 1780R-Series Service Manual 5–15 Figure 5–7: Adjustment and test point locations on the W aveform HV Supply circuit board (Assembly 16.) NOTE . The +5 V supply is the r eference supply for the instrument. If it is adjusted, the entir e instrument will need to be recalibrated. Do not adjust the +5 V supply if it is within l[...]

Adjustment Procedures 5–16 1780R-Series Service Manual <HORIZ POS POT> Select <CONTINUOUS>. This indicates that the instrument has a continuous Horizontal Position control (dual wiper potentiometer). <TC ON VC IN LS> Select <ENABLE>. T iming cursor dots are placed on the V oltage Cursors when in Line Select for ease in vie[...]

Adjustment Procedures 1780R-Series Service Manual 5–17 d. Set the 1780R-Series front-panel SCALE and INTENSITY controls for normal brightness. Figure 5–8: Adjustment locations on the V ectorscope HV Supply circuit board (Assembly A3) 7. Adjust V ector Astigmatism and Focus a. Set the front-panel FOCUS control to midrange between “beeps.” b.[...]

Adjustment Procedures 5–18 1780R-Series Service Manual Figure 5–9: Adjustment locations on the Microprocessor circuit board (Assembly A5) e. Press the CALIBRA TE button. Select VOL T AGE CURSORS ZERO SET on the V ectorscope CR T menu. f. Use the VER T POS control to center the nulled cursors on the W aveform CR T . If the cursors are not overla[...]

Adjustment Procedures 1780R-Series Service Manual 5–19 Figure 5–10: W aveform circuit board (Assembly A2) adjustment, test point, and jumper locations.[...]

Adjustment Procedures 5–20 1780R-Series Service Manual q. Select RIGHT DISPLA Y -WFM mode. Press the CONFIGURE button to On and select COUPLING-DC on P AGE 1. Press the CONFIGURE button to exit the menu. r. Disconnect the DMM test leads from A2U810. NOTE . Leave the 1780R-Series INPUT selection set to CH B1 so that no input signal is displayed wh[...]

Adjustment Procedures 1780R-Series Service Manual 5–21 11 . Adjust V ector CR T T race Rotation, Orthogonality , and Geometry a. Press the button under the V ectorscope CR T to On. b. T ouch the TRACE ROT A TION pad on the W aveform CR T . Be sure that the circle surrounds the words TRACE ROT A TION. c. T urn the Precision Measurement Control to [...]

Adjustment Procedures 5–22 1780R-Series Service Manual d. Press the CALIBRA TE button to exit the menu. 13. Adjust Picture Monitor a. Set 1780R-Series INPUT selection to CH A. b. Select the LEFT DISPLA Y -PIX mode. c. Adjust Pix V ert Position (A6R407), Pix V ert Gain (A6R404), Pix Horiz Gain (A6R604), and Pix Horiz Pos (A6R606) for a slightly un[...]

Adjustment Procedures 1780R-Series Service Manual 5–23 d. Set the V AC for a 999.9 mV output amplitude. Check that the +Lum button is pressed in and the Lum/Sync button is out. Check that the correct television standard (NTSC, P AL, or P AL-M) is selected. NOTE . Leave V AC +Lum and Lum/Sync buttons and television standar d set as described in pa[...]

Adjustment Procedures 5–24 1780R-Series Service Manual remain lit but not the A-B1 selection.) The display should become a nearly flat trace and the left CR T should display the messages:        g. If these messages are not displayed, repeat part f. of th[...]

Adjustment Procedures 1780R-Series Service Manual 5–25 Figure 5–13: Input & BNC circuit board (A8) adjustments, shown as they would appear with the instrument on its left side 17. Match Input Gains a. Connect the V AC output cable to a dual input coupler . b. Connect one side of the coupler to the CH B1 INPUT and the other side to the CH A [...]

Adjustment Procedures 5–26 1780R-Series Service Manual Figure 5–14: T est equipment connections for matching CH A and CH B1 input gains. j. Move the side of the dual input coupler from the 1780R-Series CH B2 INPUT to the CH B3 INPUT . k. Select 1780R-Series B1-B3 INPUT . l. Adjust Gain B3 (A8R394) for minimum amplitude or null display . m. Sele[...]

Adjustment Procedures 1780R-Series Service Manual 5–27 NOTE . T o eliminate generator signal DC level error , if pr esent, when performing parts e. thr ough h. of this step, select COUPLING-GND on P AGE 1 of the Configur e menu. Use the VERT POS control to position the trace to the W aveform CRT graticule baseline. Perform parts e. through h. and[...]

Adjustment Procedures 5–28 1780R-Series Service Manual e. Adjust V ar Gain Centering (A2R514) for a Calibrator signal amplitude of 65 IRE for NTSC (or 450 mV for either NTSC or P AL). f. Press the CONFIGURE button and select COUPLING-DC. g. For NTSC only: Check that ABS UNITS-mV is selected on P AGE 2. h. Set the V AR W A VEFORM GAIN to Off. i. P[...]

Adjustment Procedures 1780R-Series Service Manual 5–29 e. Check that the V oltage Cursors menu on the V ectorscope CR T indicates that ABSOLUTE and SEP ARA TE are selected. If not, make this selection. f. Use the Precision Measurement control to overlay CURSOR 1 trace on the calibrator upper trace. T ouch CURSOR 2 pad and overlay the CURSOR 2 tra[...]

Adjustment Procedures 5–30 1780R-Series Service Manual NOTE . T ypically , A2R612 is set fully counter clockwise and A2R418 is set fully clockwise. A2R534 is set nearly fully clockwise. f. Set the W A VEFORM GAIN to X5. g. Set the generator multiburst frequency range to Low . h. Adjust Limiter (A2R628) until the off-screen recovery is good; that [...]

Adjustment Procedures 1780R-Series Service Manual 5–31 Figure 5–15: T est equipment connections for adjusting CH A frequency response t. Adjust A2C527 for 100 IRE (700 mV for P AL) signal amplitude on the W aveform CR T . u. Recheck the amplitudes at 3.58 MHz (4.43 MHz for P AL) and 5 MHz. Readjust A2C61 1 and A2C527 if necessary . v. Set the g[...]

Adjustment Procedures 5–32 1780R-Series Service Manual NOTE . Repeat parts v . thr ough y . of this step, as necessary , to obtain the fr equency response described. z. Adjust the generator frequency and check for a decreased amplitude of 1% to 3% at 15 MHz, and 4%to 7% at 20 MHz. If the amplitudes at these frequencies are incorrect, then adjust [...]

Adjustment Procedures 1780R-Series Service Manual 5–33 c. Select the following 1780R-Series settings: INPUT A-B1, W A VEFORM HORIZONT AL-ONE-FIELD, and W A VEFORM GAIN-X5-On. NOTE . Do not turn the CMR adjustments given in parts d., g., and j. of this step if chr ominance nulls within 14 IRE for NTSC (100 mV for P AL). d. Adjust B1 CMR (A2C1329, [...]

Adjustment Procedures 5–34 1780R-Series Service Manual amplitude so the W aveform CR T display is 100 IRE (700 mV for P AL) in amplitude. f. Adjust the peak-to-peak detector amplifier +Level control to turn on the green light. Note the DMM reading. g. Set the generator frequency to 10 MHz and adjust the output amplitude to obtain the same DMM rea[...]

Adjustment Procedures 1780R-Series Service Manual 5–35 e. Disconnect the equipment from CH B3 INPUT . f. Disconnect the termination from the PIX MON OUT connector . 27. Adjust Luminance Filter T ransient Response (Chroma Rejection) a. Connect a Color Bar signal to the 1780R-Series CH A INPUT . T ermi- nate the opposite side of the loop-through in[...]

Adjustment Procedures 5–36 1780R-Series Service Manual c. Set the leveled sine wave generator output frequency to 3.58 MHz (4.43 MHz for P AL) and its output amplitude to 100 IRE for NTSC (700 mV for P AL). d. Select FIL TER-CHROM mode. Check that WFM HORIZONT AL-ONE- LINE is selected. NOTE . In most cases, only the Chr om Gain (A2R828) may need [...]

Adjustment Procedures 1780R-Series Service Manual 5–37 p. Check that FIL TER-CHROM and ONE-LINE are still selected. q. Set the television test signal generator for Horizontal Unlock. r. Use the 1780R VER T POS and HORIZ POS to center the green-magenta transition on the W aveform CR T . s. Set the WFM HORIZONT AL MAGNIFIER to 0.25 m s/DIV . t. Che[...]

Adjustment Procedures 5–38 1780R-Series Service Manual j. Select the FIL TER-FLA T mode. Select COUPLING-DC on the Configure menu. Press the CONFIGURE button to exit the menu. 32. Adjust Horizontal T iming NOTE . Perform Step 39, Adjust T iming Cursors, befor e checking and adjusting horizontal timing. a. Check that no signal is applied to the CH[...]

Adjustment Procedures 1780R-Series Service Manual 5–39 k. Adjust the Precision Measurement control so that the CURSOR 1 and CURSOR 2 dots are exactly 10 divisions apart (The bright-up dots should coincide with the 2nd and 12th major graticule marks when the D T readout is exactly 100.000 m s.) NOTE . The dots may have to be set slightly short (1/[...]

Adjustment Procedures 5–40 1780R-Series Service Manual d. Use the HORIZ POS control to position the center of the vertical sync to the mid-screen graticule mark. e. Set the WFM HORIZONT AL-MAGNIFIER to OFF . f. Adjust H Mag Reg (A2R344) to center the vertical sync on the screen. g. Disconnect the Color Bar signal from the CH A INPUT . NOTE . If A[...]

Adjustment Procedures 1780R-Series Service Manual 5–41 V ariable resistors are shown rotated 90 _ from the way they are mounted on the assembly; variable resistors are adjustable from the top of the circuit board. Figure 5–16: Adjustment and test point (TP) locations for the Oscillator circuit board (Assembly A7). NOTE . The adjustments given i[...]

Adjustment Procedures 5–42 1780R-Series Service Manual m. Adjust DC Balance (A7R286) so that the NTSC demodulated burst pulse overlays the demodulated baseline as displayed on the test oscilloscope. (For P AL, there are two bursts. Adjust the burst that will null.) n. Disconnect the test oscilloscope probe from the test point. Disconnect the Blac[...]

Adjustment Procedures 1780R-Series Service Manual 5–43 l. Use the variable VECTOR GAIN control to place the burst vector dot(s) to the graticule reference 75% mark(s). If necessary , use the VER T and HORIZ POS controls to center the vector display center dot. m. Remove the 75 W termination from CH A INPUT . n. T urn the variable VECTOR GAIN cont[...]

Adjustment Procedures 5–44 1780R-Series Service Manual ab. Note the exact phase position of the burst vector(s) for use as a reference. NOTE . The fr ont-panel variable VECTOR GAIN contr ol can be used to move the burst vector to the compass r ose while performing parts bb. through ee. ac. Set the television test signal generator Color Bar Ampl b[...]

Adjustment Procedures 1780R-Series Service Manual 5–45 d. Set the VECTOR GAIN to V AR. e. Move the subcarrier vector to the V ectorscope CR T compass rose using the variable VECTOR GAIN control. f. Connect the 10X probe from the test oscilloscope to A6TP379 on the V ectorscope board. Set the test oscilloscope vertical deflection factor to 0.5 V/D[...]

Adjustment Procedures 5–46 1780R-Series Service Manual NOTE . Repeat parts p. thr ough t. of this step, if necessary , for pr oper deflection. u. T ouch the GO TO DIFF GAIN pad on the V ectorscope CR T . Check that SINGLE is selected. Use the variable VECTOR GAIN control to position the burst vector to the CR T compass rose. v. Use the Precision [...]

Adjustment Procedures 1780R-Series Service Manual 5–47 ah. T ouch the GO TO DIFF PHASE pad on the V ectorscope CR T . Check that DOUBLE is selected. ai. Press the button located below the left CR T . Use the VER T and HORIZ POS controls to position the vector center dot to the center of the V ectorscope CR T . Rotate the Precision Measurement con[...]

Adjustment Procedures 5–48 1780R-Series Service Manual Figure 5–18: Noise Reduction-OFF . Demod offset properly adjusted 38. Adjust SCH Phase a. Connect a Color Bar signal from a TEKTRONIX TSG-170A NTSC T elevision Generator to the 1780R CH A INPUT connector . Connect a 75 W end-line termination to the remaining CH A INPUT connector . Connect t[...]

Adjustment Procedures 1780R-Series Service Manual 5–49 –Slope and Normal mode triggering. (For P AL, set the time base to 20 m s/Div .) g. Check that the 1780R-Series WFM HORIZONT AL-ONE-LINE (or TWO-LINE) is selected. Press the LINE SELECT button to On. Select LINE SEL MENU-ON, WFM= VECT -YES, and FIELD 1 OF 4 for NTSC (FIELD 2 OF 8 for P AL).[...]

Adjustment Procedures 5–50 1780R-Series Service Manual r. If necessary , move the jumper on A2J986 so the SCH dot is closest to the burst vector reference line as displayed on the V ectorscope CR T . (That is, close to the 0 _ mark on the graticule d Q scale.) NOTE . The jumper on A2J986 should be left at the position set by the factory . s. Adju[...]

Adjustment Procedures 1780R-Series Service Manual 5–51 Figure 5–19: Z-Axis circuit board (A4) adjustment and test point locations e. Disconnect the probe from A4TP108. f. Connect a 10X probe from the test oscilloscope vertical input to A4TP100. Set the test oscilloscope vertical deflection factor to 2 V/ Div and the sweep rate to 2 ms/Div . g. [...]

Adjustment Procedures 5–52 1780R-Series Service Manual a. Connect a Pulse & Bar signal from a TEKTRONIX TSG170A NTSC T elevision Generator to the 1780R CH A INPUT connector . (For the 1781R, use the TSG271 P AL Generator .) b. Select REF-INT on the 1780R-Series front panel. c. Press the button below the V ectorscope CR T to On. Press the PHAS[...]

Adjustment Procedures 1780R-Series Service Manual 5–53 Figure 5–20: V ector graticule x- and y-axis markings for adjusting xy input gains f. Move the generator output connections to pin 5 (–Y) and pin 7 (+Y) on the XY Input connector . g. Adjust Y Gain (A6R308) so the vertical trace is as long as the vertical axis graticule line located insid[...]

Adjustment Procedures 5–54 1780R-Series Service Manual Figure 5–21: Properly adjusted xy input gains 42. Adjust RGB/YRGB a. Connect a Color Bar signal from the television test signal generator , through a 75 W feed-through terminator , to the 1780R-Series CH A INPUT . b. Check that a Black Burst signal is applied to the 1780R-Series EXT REF con[...]

Adjustment Procedures 1780R-Series Service Manual 5–55 h. Connect the output of the function generator to the test oscilloscope vertical amplifier input. Set the generator controls for 1 kHz, 0 V to +10 V , square waves as displayed on the test oscilloscope CR T . i. Disconnect the function generator output signal from the test oscillo- scope. Co[...]

Adjustment Procedures 5–56 1780R-Series Service Manual j. Press the LINE SELECT button to turn it off. If necessary , readjust the INTENSITY and FOCUS controls for best readout and trace definition. k. Disconnect the Color Bar signal from the CH A INPUT . 44. Adjust Probe Compensation a. Set the V AC amplitude to 199.9 mV . Connect the V AC outpu[...]

Adjustment Procedures 1780R-Series Service Manual 5–57 e. Adjust Probe Calibrator Amplitude (A6R795) to obtain a null on the test oscilloscope CR T display . f. Disconnect the test oscilloscope from the V AC and the 1X probe from the 1780R-Series CAL OUT connector . g. Connect a Pulse & Bar signal from a television test signal generator , thr[...]

Adjustment Procedures 5–58 1780R-Series Service Manual h. Disconnect the Pulse & Bar signal from the front-panel PROBE input connector . 47. Adjust Probe Frequency Response a. Connect the television test signal generator Multiburst signal, through a 75 W feed-through terminator , to the 1780R-Series front-panel PROBE input connector . b. Conn[...]

Adjustment Procedures 1780R-Series Service Manual 5–59 o. Set the generator output frequency to 3.58 MHz (4.43 MHz for P AL), 5 MHz, 8 MHz, and then to 10 MHz. p. Check that the displayed amplitude on the W aveform CR T is within ± 3% or ± 21.4 mV for NTSC ( ± 21.0 mV for P AL) of the amplitude noted in part l. of this step for each frequency [...]

Adjustment Procedures 5–60 1780R-Series Service Manual[...]

[...]

1780R-Series Service Manual 6–1 Preventive Maintenance Preventive maintenance consists of cleaning, visual inspection, performance checks, and (if needed) readjustment. The preventive maintenance schedule established for the instrument should be based on the amount of use it receives and the environment in which it is operated. Under average cond[...]

Preventive Maintenance 6–2 1780R-Series Service Manual The instrument should be cleaned often enough to prevent dust and dirt from accumulating. Dirt acts as a thermal insulator , preventing effective heat dissipation, and can also provide high-resistance electrical leakage paths between conductors or components in a humid environment. CAUTION. D[...]

1780R-Series Service Manual 6–3 Static-Sensitive Components This instrument contains electrical components that are susceptible to damage from static discharge. Static voltages from 1 kV to 30 kV are common in unprotected environments. T able 6–1 shows the relative static discharge susceptibility of various semiconductor classes. T able 6–1: [...]

Static-Sensitive Components 6–4 1780R-Series Service Manual 7. Do not slide components over any surface. 8. A void handling components in areas that have a floor or work surface covering capable of generating a static charge. 9. Use a soldering iron that is connected to earth ground. 10. Use only wick-type or special anti-static suction desolderi[...]

1780R-Series Service Manual 6–5 Corrective Maintenance CAUTION. A 2% RMA flux content solder is r ecommended for making repairs in this instrument. Cleaning of r osin residue is not r ecommended. Most cleaning solvents tend to r eactivate the rosin and spr ead it under components wher e it may cause corr osion under humid conditions. The rosin r [...]

Corrective Maintenance 6–6 1780R-Series Service Manual Mechanical Disassembly/Assembly Use these instructions for disassembly and then reverse them for reassembly , unless noted otherwise. The Inner Bezel Frame Removal and Graticule Light Removal procedures can be performed with the instrument installed in the rack mounting cabinet or portable ca[...]

Corrective Maintenance 1780R-Series Service Manual 6–7 Use the following procedure to replace the graticule lights. 1. Remove the SCALE, FOCUS, INTENSITY , VER T POS, and HORIZ POS knobs by loosening their set screws. 2. Use pliers to grip the CR T Panel protrusion where the SCALE control shaft is located. Carefully pull the panel outward until i[...]

Corrective Maintenance 6–8 1780R-Series Service Manual Use the following procedure to remove the instrument from the cabinet or case. 1. Check that the power cord is disconnected. Disconnect all the coaxial cables from the rear-panel BNC connectors. 2. Remove the instrument from the rack mounting cabinet or from its portable case. (Four 10–32 s[...]

Corrective Maintenance 1780R-Series Service Manual 6–9 Figure 6–2: Positions of the waveform CRT deflection leads 6. For the CR T being removed: Disconnect the appropriate Trace Rotation connector from the Interconnect board (A1 1). For the waveform CR T , the connector is J165; for the vectorscope CR T , the connector is J143 on A1 1. W ARNING[...]

Corrective Maintenance 6–10 1780R-Series Service Manual Use the following procedure to replace the CR T . 1. Slide the CR T partially into position so the CR T base pins will align with the socket. Push the socket into position onto the CR T pins. CAUTION. A void bending the CRT base pins when pushing the CRT into the socket. Do not pinch wir es [...]

Corrective Maintenance 1780R-Series Service Manual 6–1 1 6. Clean the face of the CR T to remove fingerprints. 7. Reconnect the PROBE connector to J498 on the V ectorscope board (A6). Install the parts removed in steps 1 through 4 of the CR T Removal proce- dure. Reconnect the ribbon cable connector to J138 on the MPU Annex board (A10). Use the f[...]

Corrective Maintenance 6–12 1780R-Series Service Manual Use the following procedure to remove the W aveform HV Supply board. 1. Remove the two screws that hold the clear plastic cover in position. 2. Remove the two 1/4-inch hex-shaped posts. W ARNING. The CRT may r etain a danger ous char ge. Ground the anode lead conductor to dischar ge the CRT [...]

Corrective Maintenance 1780R-Series Service Manual 6–13 Use the following procedure to remove the L V Power Supply board. 1. Remove the MPU Annex (A10), W aveform HV Supply (A16), and the Fuse (A17) boards using the procedures given previously . 2. Remove the screws and one nut that hold the large and small metal shields in place. The nut is loca[...]

Corrective Maintenance 6–14 1780R-Series Service Manual 7. T o re-assemble, reverse the procedure. Use the following procedure to remove the Oscillator board. 1. Unsolder the ground and center conductor wires from the EXT CW REF rear-panel BNC connector . 2. Unplug the coaxial cable connector from J499 on the Oscillator board (A7). 3. Remove two [...]

1780R-Series Service Manual 6–15 T roubleshooting Since this manual is a troubleshooting aid, its organization is described here. This material is general, and does not cover specific cases. T roubleshooting Aids The foldout pages at the back of the manual contain block and schematic diagrams, circuit board illustrations, and look-up charts. See [...]

T roubleshooting 6–16 1780R-Series Service Manual Look Up Charts. Each schematic diagram is assigned an alpha-numeric grid and a look-up chart which lists the grid location of components on that schematic. Circuit Board Illustrations. Electrical components, connectors, and test points are identified on circuit board illustrations, which are locat[...]

T roubleshooting 1780R-Series Service Manual 6–17 Assembly and Circuit Numbering. All circuit board assemblies are assigned assembly or “A” numbers. T able 6–3 and Figure 6–5 show the assembly numbers and their locations for this instrument. NOTE . Always check the parts list for part numbers and descriptions when or dering replacement pa[...]

T roubleshooting 6–18 1780R-Series Service Manual Figure 6–5: 1780R-Series circuit board assembly locations[...]

T roubleshooting 1780R-Series Service Manual 6–19 General T roubleshooting T echniques 1. Be sure the instrument is malfunctioning. See Section 2 to determine whether the instrument is operating properly . Check the operation of front-panel controls, associated equipment, and input signal connections. CAUTION. Use extr eme care when pr obing with[...]

T roubleshooting 6–20 1780R-Series Service Manual[...]

1780R-Series Service Manual 6–21 T roubleshooting Procedures Board Accessibility Servicing some circuit assemblies in this instrument requires removal of other components (shields, cables, circuit boards, etc.). Some procedures call out special equipment such as cable extenders or external power supplies. The following information details the pro[...]

T roubleshooting Procedures 6–22 1780R-Series Service Manual W ARNING. Danger ous potentials exist on the L V Power Supply boar d. Use car e when tr oubleshooting to prevent personal injury . Read the instructions given in the T r oubleshooting portion of this section. Power Supply The 1780R-Series power supply presents special troubleshooting pr[...]

T roubleshooting Procedures 1780R-Series Service Manual 6–23 DC Power Supply: V ariable voltage supply , 0–20 V DC at 1A. For example: A TEKTRONIX PS 503A Power Supply . (Requires a TM500-Series mainframe.) Isolation T ransformer: For example: Stancor GIS 1000. T est Oscilloscope: See Equipment Required List for the Performance Verification or [...]

T roubleshooting Procedures 6–24 1780R-Series Service Manual 5. Slowly increase DC power supply voltage. At about 16 V U460 turns on and the base of the Switcher (Q250) has a waveform with a 90% duty cycle, 5 V peak-to-peak amplitude (+1 V to –4 V), and a 20 m s period. 6. Slowly decrease the DC power supply voltage. At approximately 12 to 13 V[...]

T roubleshooting Procedures 1780R-Series Service Manual 6–25 13. Set the V ariac to 40 V . Adjust the external DC supply for 18 V . 14. Use the test oscilloscope to check the waveform on the base of Q460 has approximately 20% duty cycle and a period of about 4 m s. 15. Connect the test oscilloscope probe to the anode of CR140 and check for an app[...]

T roubleshooting Procedures 6–26 1780R-Series Service Manual D. U460 pin 3 E. U460 pin 4 23. Connect the test oscilloscope probe to the emitter of Q250. W ith the variac set to 1 10 V , temporarily short the +5 V supply to ground, and check that the voltage on Q250 does not rise above 1.7 V . Power supply should operate in short bursts and then s[...]

T roubleshooting Procedures 1780R-Series Service Manual 6–27 Figure 6–8: A. Q250 collector waveform. B. Q250 base waveform. C. Q350–Q451 emitter waveform. D. U460 pin 3 waveform. E. U460 pin 4 waveform 24. Install a plug jumper on J122. Connect the test oscilloscope probe to the +5 V supply . Supply should turn on in short bursts and not incr[...]

T roubleshooting Procedures 6–28 1780R-Series Service Manual Figure 6–9: +5 V supply output waveform when over voltage protection is operating Current Limit Adjustment (A1R466) V ariable Auto T ransformer: See Equipment Required List in the Adjustment Procedures section. T elevision T est Signal Genera- tor (Optional): Color Bars. See Adjustmen[...]

T roubleshooting Procedures 1780R-Series Service Manual 6–29 4. Set the 1780R-Series instrument POWER switch to ON. 5. Set the 1780R-Series front-panel controls for best viewing of the color bar vectors on the V ectorscope CR T and of the waveform displayed on the W aveform CR T . T urn the SCALE control to obtain the highest level of illuminatio[...]

T roubleshooting Procedures 6–30 1780R-Series Service Manual T ouch Panel Sensitivity Adjustment (A9R292) T est Oscilloscope: See Equipment Required List for the Performance Verification or Adjustment Procedures. 1. Check that the 1780R-Series instrument POWER switch is set to OFF (ST ANDBY). 2. Remove the CR T Panel and CR T Frame Outer Bezel by[...]

[...]

1780R-Series Service Manual 7–1 Options CRT Options The standard instrument is shipped with a P31 (green) phosphor CR T s installed. If Option 74 is ordered, the instrument is shipped with P4 (white) phosphor CR T s installed. The Option 74 CR T part numbers are given at the end of the Replaceable Electrical Parts List. Power Cord Options Any of [...]

Options 7–2 1780R-Series Service Manual[...]

[...]

1780R-Series Service Manual 8–1 Replaceable Electrical Parts This section contains a list of the electrical components for the <instrument>. Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local T ektronix field office or representative. Changes to T ektronix pro[...]

Replaceable Electrical Parts 8–2 1780R-Series Service Manual Parts list column descriptions Column Column name Description 1 Component number The component number appears on diagrams and circuit board illustrations, located in the diagrams section. Assembly numbers are clearly marked on each diagram and circuit board illustration in the Diagrams [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–3 Manufacturers cross index Mfr . code Manufacturer Address City , state, zip code 00779 AMP INC. CUSTOMER SER VICE DEPT PO BOX 3608 HARRISBURG, P A 17105–3608 01295 TEXAS INSTRUMENTS INC SEMICONDUCT OR GROUP 13500 N CENTRAL EXPRESSWA Y PO BOX 655303 DALLAS, TX 75272–5303 01884 DEARBO[...]

Replaceable Electrical Parts 8–4 1780R-Series Service Manual Manufacturers cross index (cont.) Mfr . code City , state, zip code Address Manufacturer 12954 MICROSEMI CORP – SCOTTSDALE 8700 E THOMAS ROAD PO BOX 1390 SCOTTSDALE, AZ 85252–5252 12969 MICROSEMI CORP W A TERTOWN DIVISION 530 PLEASANT STREET W ATER TWON, MA 02172 13103 THERMALLOY IN[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–5 Manufacturers cross index (cont.) Mfr . code City , state, zip code Address Manufacturer 33095 SPECTRUM CONTROL INC 8061 A VONIA RD FAIRVIEW , P A 16415 34335 ADV ANCED MICRO DEVICES INC 901 THOMPSON PLACE PO BOX 3453 SUNNYV ALE, CA 94088–3453 34371 HARRIS SEMICONDUCTORS SEMICONDUCTOR[...]

Replaceable Electrical Parts 8–6 1780R-Series Service Manual Manufacturers cross index (cont.) Mfr . code City , state, zip code Address Manufacturer 62703 MICRO QUALITY SEMICONDUCTOR 1000 N SHILOH RD PO BOX 6676 GARLAND, TX 75040 62786 HIT ACHI AMERICA L TD HIT ACHI PLAZA 2000 SIERRA POINT PKWY BRISBAINE, CA 94005 64537 KDI/TRIANGLE ELECTRONICS [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–7 Manufacturers cross index (cont.) Mfr . code City , state, zip code Address Manufacturer TK2601 MAXTEK COMPONENTS CORPORA TION 13335 SW TERMAN RD PO BOX 428 BEA VER TON, OR 97075–0428 TK6168 L–3 COMMUNICA TIONS CORP NARDA MICROWA VE–EAST SEMICONDUCT OR DIVISION 75 TECHNOLOGY DRIVE[...]

Replaceable Electrical Parts 8–8 1780R-Series Service Manual Replaceable electrical parts list Component number T ektronix part number Serial no. effective Serial no. discont’d Name & description Mfr . code Mfr . part number A1 671–0460–12 CIRCUIT BD ASSY :LOW VOL T AGE 80009 671–0460–12 A2 671–0467–18 B030472 CIRCUIT BD ASSY :W[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–9 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1 671–0460–12 CIRCUIT BD ASSY :LOW VOL T AGE 80009 671–0460–12 A1C100 290–1302–00 CAP ,FXD,ALUM:[...]

Replaceable Electrical Parts 8–10 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1C462 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.1UF ,20%,50V ,Z5U 04222 SA105E104MAA A1C463 281–0823–00 CA[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–1 1 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1CR353 152–0400–00 DIODE,RECT :F AST RCVRY ,400V ,1A,200NS,1N4936,DO–41 04713 1N4936RL A1CR354 152?[...]

Replaceable Electrical Parts 8–12 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1L420 108–1520–00 INDUCTOR,FXD:POWER,47UH,10%,I<1.5A,RDC<0.056 OHM,Q>20,SRF>5.8MHZ,FERRITE [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–13 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1Q360 151–0188–00 TRANSISTOR,SIG:BIPOLAR,PNP ,40V ,200MA,250MHZ, AMPLIFIER,2N3906,T O–92 EBC 04713 2N[...]

Replaceable Electrical Parts 8–14 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1R223 322–3001–00 RES,FXD,FILM:10 OHM,1%,0.2W 57668 CRB20T68EFX10R0 A1R224 322–3097–00 RES,FXD,FILM[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–15 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1S250 260–2485–00 SWITCH,THRMSTC:SPST ,NC,OPEN 80.0 DEGREES C,CL 69.4 DEGREES C,15A,120V AC 14604 2450?[...]

Replaceable Electrical Parts 8–16 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1W520 131–0566–00 BUS,CONDUCT OR:DUMMY RES,0.094 OD X 0.225 L W/WIRE LEADS 57668 TPW 02–000 A1W540 13[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–17 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2 671–0467–18 B030472 CIRCUIT BD ASSY :WA VEFORM MONITOR,NTSC 80009 671–0467–18 A2 671–0467–19 [...]

Replaceable Electrical Parts 8–18 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C414 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.1UF ,20%,50V 04222 SA105E104MAA A2C415 281–0786–00 CAP ,FX[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–19 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C651 283–0189–00 CAP ,FXD,CER DI:0.1UF ,20%,400V SQUARE 04222 SR508C104MAA A2C660 290–0974–00 CAP [...]

Replaceable Electrical Parts 8–20 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C842 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.1UF ,20%,50V 04222 SA105E104MAA A2C844 281–0791–00 CAP ,FX[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–21 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C101 1 281–0765–00 CAP ,FXD,CER DI:100PF ,5%,100V TUBULAR 04222 SA102A101JAA A2C1016 281–0775–01 C[...]

Replaceable Electrical Parts 8–22 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C1 160 281–0759–00 CAP ,FXD,CERAMIC:MLC,22PF ,10%,100V 04222 SA102A220KAA A2C1 171 281–0767–00 CAP[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–23 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C1370 283–0625–01 CAP ,FXDCA DI:220PF ,1%,500V (1780R ONL Y) 09023 CDA10FD221F03 A2C1370 283–0644–[...]

Replaceable Electrical Parts 8–24 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C1571 283–0633–00 CAP ,FXDCA DI:77PF ,1%,100V 09023 CD15ED770F03 A2C1575 283–0632–00 CAP ,FXDCA DI[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–25 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2CR625 152–0141–02 DIODE,SIG:UL TRA F AST ,40V ,150MA,4NS,2PF ,1N4152 01295 1N4152R A2CR651 152–0141?[...]

Replaceable Electrical Parts 8–26 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2CR1 142 152–0066–00 DIODE,RECT :400V ,1A,IFSM=30A,1.2VF , 2US,GP10G/1N5060 0LUA3 1N5060 A2CR1 150 152?[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–27 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2CR1597 152–0141–02 DIODE,SIG:UL TRA F AST ,40V ,150MA,4NS,2PF ,1N4152 01295 1N4152R A2J1 131–0106–[...]

Replaceable Electrical Parts 8–28 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2J1203 131–4752–00 CONN,HDR::PCB,MALE,45 DEG,1 X 2,0.1 CTR,0.240 MLG X 0.1 10 T AIL,30 GOLD, 58050 082?[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–29 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2L1350 108–0317–00 INDUCTOR,FXD:CUST OM,POWER,15UH,10%,IDC<460 MA,RDC<1.2 OHM,Q>55@2.5MHZ,SRF&[...]

Replaceable Electrical Parts 8–30 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2Q354 151–0190–00 TRANSISTOR,SIG:BIPOLAR,NPN,40V ,200MA, 300MHZ,AMPLIFIER,2N3904,T O–92 EBC 04713 2N3[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–31 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2Q514 151–0619–00 TRANSISTOR,SIG:BIPOLAR,NPN,35V ,20MA, SUPERMA TCHED DUAL,LM394H/MA T02FH,T O–78 270[...]

Replaceable Electrical Parts 8–32 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number *END A TTACHED P ARTS* A2Q643 151–0916–00 TRANSISTOR,PWR:BIPOLAR,PNP ,300V ,100MA, 60MHZ,AMPLIFIER,BF472[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–33 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2Q970 151–0190–00 TRANSISTOR,SIG:BIPOLAR,NPN,40V ,200MA, 300MHZ,AMPLIFIER,2N3904,T O–92 EBC 04713 2N3[...]

Replaceable Electrical Parts 8–34 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2Q1346 151–0190–00 TRANSISTOR,SIG:BIPOLAR,NPN,40V ,200MA, 300MHZ,AMPLIFIER,2N3904,T O–92 EBC 04713 2N[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–35 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2Q1529 151–0188–00 TRANSISTOR,SIG:BIPOLAR,PNP ,40V ,200MA, 250MHZ,AMPLIFIER,2N3906,T O–92 EBC 04713 2[...]

Replaceable Electrical Parts 8–36 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R281 322–3318–00 RES,FXD,FILM:MET AL FILM,20K OHM,1%,0.2W 57668 CRB20T68EFX2002 A2R282 322–3318–00[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–37 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R374 322–3487–00 RES,FXD,FILM:500 OHM,1%,0.2W ,TC=TO 57668 RB20 FXE 499E A2R375 322–3487–00 RES,FX[...]

Replaceable Electrical Parts 8–38 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R425 322–31 14–00 RES,FXD,FILM:150 OHM,1%,0.2W 57668 CRB20–FX–150E A2R428 322–3252–00 RES,FXD,[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–39 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R487 322–3300–00 RES,FXD,FILM:13K OHM,1%,0.2W ,TC=T0 (1780R ONL Y) 80009 322–3300–00 A2R487 322–[...]

Replaceable Electrical Parts 8–40 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R536 31 1–2239–00 RES,V AR,TRMR:CERMET ,100K OHM,20%,0.5W,0.197 SQ,TOP ADJUST ,T&R TK2073 GF06UT2 [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–41 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R610 322–3310–00 RES,FXD,FILM:16.5K OHM,1%,0.2W ,TC=T0 57668 CRB20 FXE 16K5 A2R61 1 322–3150–00 RE[...]

Replaceable Electrical Parts 8–42 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R665 322–3254–00 RES,FXD,FILM:4.32K OHM,1%,0.2W ,TC=T0 91637 CCF50–4321F–R36 A2R666 322–3164–0[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–43 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R727 322–3335–00 RES,FXD,FILM:30.1K OHM,1%,0.2W ,TC=T0 57668 CRB20 FXE 30K1 A2R728 322–341 1–00 RE[...]

Replaceable Electrical Parts 8–44 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R818 322–3356–00 RES,FXD,FILM:49.9K OHM,1%,0.2W ,TC=T0 57668 CRB20 FXE 49K9 A2R819 322–3356–00 RES[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–45 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R912 322–3485–07 RES,FXD,FILM:5K OHM,0.1%,0.2W ,TC=T9 91637 CCF501C50000B A2R913 322–3485–07 RES,F[...]

Replaceable Electrical Parts 8–46 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R985 322–3193–00 RES,FXD:MET AL FILM,1K OHM,1%,0.2W 57668 CRB20T68EFX1001 A2R987 307–0730–00 RES N[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–47 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1037 322–3147–00 RES,FXD,FILM:332 OHM,1%,0.2W 57668 CRB20 FXE 332E A2R1038 322–3147–00 RES,FXD,FI[...]

Replaceable Electrical Parts 8–48 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1 1 17 322–3226–00 RES,FXD:MET AL FILM,2.21K OHM,1%,0.2W 57668 CRB20T68EFX221 1 A2R1 1 19 322–3193?[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–49 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1 178 322–3306–00 RES,FXD:MET AL FILM,15K OHM,1%,0.2W 57668 CRB20T68EFX1502 A2R1 179 322–3097–00 [...]

Replaceable Electrical Parts 8–50 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1252 322–3258–00 RES,FXD:MET AL FILM,4.75K OHM,1%,0.2W 56845 CCF50–4751F–R36 A2R1253 322–3289?[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–51 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1312 322–3243–00 RES,FXD:MET AL FILM,3.32K OHM,1%,0.2W 91637 CCF50–3321F–R36 A2R1314 315–0755?[...]

Replaceable Electrical Parts 8–52 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1357 322–3385–00 RES,FXD:MET AL FILM,100K OHM,1%,0.2W 57668 CRB20T29EFX1003 A2R1359 322–3126–00 R[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–53 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1417 322–3193–00 RES,FXD:MET AL FILM,1K OHM,1%,0.2W 57668 CRB20T68EFX1001 A2R1420 322–3193–00 RES[...]

Replaceable Electrical Parts 8–54 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1476 322–3258–00 RES,FXD:MET AL FILM,4.75K OHM,1%,0.2W 56845 CCF50–4751F–R36 A2R1477 322–3066?[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–55 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1578 322–3097–00 RES,FXD,FILM:100 OHM,1%,0.2W 57668 CRB20T68EFX1000 A2R1579 322–3285–00 RES,FXD,F[...]

Replaceable Electrical Parts 8–56 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2TP1273 214–4085–00 TERM,TEST POINT :0.070 ID,0.220 H,0.063 DIA PCB,0.015 X 0.032 BRASS,W/ RED NYLON CO[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–57 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2U565 156–2460–00 ICSC:BIPOLAR,MODULA TOR/DEMODULA TOR, BALANCED,MC1496P ,DIP14.3 04713 MC1496P A2U580 [...]

Replaceable Electrical Parts 8–58 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2U905 156–2584–00 IC,DIGIT AL:HCMOS,FLIP FLOP ,OCTAL D–TYPE,CLEAR,74HC273,DIP20.3,TUBE 01295 SN74HC27[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–59 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2U101 1 156–0259–00 IC,LINEAR:BIPOLAR,TRANSIST OR ARRA Y ,(5)NPN,INDEPENDENT ,15V ,100MA, 300MHZ,AMPLIF[...]

Replaceable Electrical Parts 8–60 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2U1270 156–1335–00 IC,DIGIT AL:LSTTL,MUL TIVIBRA TOR,DUAL RETRIG MONOST ABLE,96LS02,DIP16.3 07263 DM96L[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–61 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2VR462 152–0760–00 DIODE,ZENER:6.2V ,2%,0.4W ,1N753C FML Y/1N5995C,DO–7 OR DO–35 04713 1N5995C A2VR[...]

Replaceable Electrical Parts 8–62 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A3 671–0459–05 CIRCUIT BD ASSY :VECTOR HV 80009 671–0459–05 A3C100 290–1310–00 CAP ,FXD,ALUM:10U[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–63 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A3C460 283–0084–00 CAP ,FXD,CER DI:270PF ,5%,1000V DISC 59660 838 533 X5FO 2715 A3C480 283–0057–00 C[...]

Replaceable Electrical Parts 8–64 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A3L1 1 1 108–1262–00 INDUCT OR,FXD:POWER,100UH,10%,I<0.75A,RDC<0.23 OHM,Q>15,SRF>5.4MHZ,BOBB[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–65 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A3R180 315–051 1–02 RES,FXD,FILM:510 OHM,.25W ,5% 50139 CB51 15 ALLEN BRADLEY ONL Y A3R181 301–0225–[...]

Replaceable Electrical Parts 8–66 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A3R460 315–0102–03 RES,FXD,FILM:1K OHM,5%,0.25W 50139 CB1025 (CARD PACK ONL Y) A3R461 315–0470–03 RE[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–67 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4 671–0461–02 B030399 CIRCUIT BD ASSY :ZAXIS 80009 671–0461–02 A4 671–0461–03 B030400 CIRCUIT B[...]

Replaceable Electrical Parts 8–68 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4C264 290–0974–00 CAP ,FXD,ALUM:10UF ,20%,50V 55680 UVX1H100MDA A4C265 290–0974–00 CAP ,FXD,ALUM:10[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–69 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4C366 290–0974–00 CAP ,FXD,ALUM:10UF ,20%,50V 55680 UVX1H100MDA A4C369 290–0974–00 CAP ,FXD,ALUM:10[...]

Replaceable Electrical Parts 8–70 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4C598 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.1UF ,20%,50V 04222 SA105E104MAA A4CR204 152–0141–02 DIODE,[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–71 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4L1 15 1 14–0438–00 INDUCTOR,V AR:SHIELDED,0.70–0.94UH,Q>65@L=65 (2.5MHZ),SLOT TEN–3–01,VER T [...]

Replaceable Electrical Parts 8–72 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4Q381 151–0188–00 TRANSISTOR,SIG:BIPOLAR,PNP ,40V ,200MA,250MHZ, AMPLIFIER,2N3906,T O–92 EBC 04713 2N[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–73 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4R293 322–3308–00 RES,FXD,FILM:15.8K OHM,1%,0.2W ,TC=T0 57668 CRB20T68EFX1582 A4R294 322–3164–00 RE[...]

Replaceable Electrical Parts 8–74 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4R397 322–3261–00 RES,FXD,FILM:5.1 1K OHM,1%,0.2W ,TC=T0 91637 CCF50–51 1 1F–R36 A4R398 322–3222?[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–75 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4R483 322–3308–00 RES,FXD,FILM:15.8K OHM,1%,0.2W ,TC=T0 57668 CRB20T68EFX1582 A4R484 322–3238–00 RE[...]

Replaceable Electrical Parts 8–76 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4U167 156–2558–00 IC,LINEAR:BIPOLAR,VOL T AGE REGULA TOR, POSITIVE,12V ,1.5A,2%,MC7812ACT ,TO–220 012[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–77 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4U346 156–0513–03 ICSC:CMOS,ANALOG MUX,8 CHANNEL,4051B,DIP16.3,TUBE 04713 MC14051BCP A4U348 156–0513?[...]

Replaceable Electrical Parts 8–78 1780R-Series Service Manual[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–79 Replaceable electrical parts list (cont.) Component number T ektronix part number Serial no. effective Serial no. discont’d Name & description Mfr . code Mfr . part number A5 671–0466–12 B030488 CIRCUIT BD ASSY :MICROPROCESSOR 80009 671–0466–12 A5 671–0466–13 B030489 [...]

Replaceable Electrical Parts 8–80 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5C335 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.1UF ,20%,50V 04222 SA105E104MAA A5C336 281–0775–01 CAP ,FX[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–81 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5C572 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.1UF ,20%,50V 04222 SA105E104MAA A5C592 290–0776–00 CAP ,FX[...]

Replaceable Electrical Parts 8–82 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5J515 131–3277–00 CONN,HDR:PCB,MALE,STR,2 X 30,0.1 CTR,0.365 H X 0.105 T AIL,SHRD/4 SIDES,CTR PLZ,30 GO[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–83 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5R315 322–3385–00 RES,FXD:MET AL FILM,100K OHM,1%,0.2W 57668 CRB20T29EFX1003 A5R355 307–0446–00 RES[...]

Replaceable Electrical Parts 8–84 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5R492 322–3130–00 B030488 RES,FXD,FILM:221 OHM,1%,0.2W 57668 CRB20T68EFX2210 A5R492 322–3101–00 B03[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–85 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number *MOUNTING P ARTS* 136–0752–00 SOCKET ,DIP:PCB,FEMALE,STR,2 X 10,0.3 CTR,0.210 H X 0.128 T AIL,TIN,PHOS B[...]

Replaceable Electrical Parts 8–86 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number *MOUNTING P ARTS* 136–0752–00 SOCKET ,DIP:PCB,FEMALE,STR,2 X 10,0.3 CTR,0.210 H X 0.128 T AIL,TIN,PHOS B[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–87 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number *END MOUNTING P ARTS* A5U330 156–3669–00 IC,PROCESSOR:NMOS,PERIPHL,DUAR T ,2681,DIP24.4 1CH66 SCN2681AC1[...]

Replaceable Electrical Parts 8–88 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5U384 156–2096–00 IC,DIGIT AL:ALSTTL,FLIP FLOP ,QUAD D–TYPE,CLEAR,74ALS175,DIP16.3,TUBE 01295 SN74ALS[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–89 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5U548 156–1312–00 IC,MISC:BIPOLAR,SAMPLE/HOLD,LOW DROOP RA TE,SMP–1 1,DIP14.3 24355 SMP1 1FY A5U550 1[...]

Replaceable Electrical Parts 8–90 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6 671–0465–13 CIRCUIT BDASSY :VECTORSCOPE,NTSC, (1780R ONL Y) 80009 671–0465–13 A6 671–0987–14 [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–91 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6C218 281–0000–00 TEST SELECT ABLE COMPONENT 80009 281–0000–00 A6C221 283–0665–00 CAP ,FXD,MICA[...]

Replaceable Electrical Parts 8–92 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6C383 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.1UF ,20%,50V ,Z5U 04222 SA105E104MAA A6C391 281–0775–01 CA[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–93 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6C554 281–0797–00 CAP ,FXD,CERAMIC:MLC,15PF ,5%,100V ,SAFETY 12969 CGB150KFN A6C555 281–0773–00 CAP[...]

Replaceable Electrical Parts 8–94 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6C747 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.1UF ,20%,50V ,Z5U 04222 SA105E104MAA A6C753 281–0775–01 CA[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–95 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6CR672 152–0066–00 DIODE,RECT :400V ,1A,IFSM=30A,1.2VF ,2US,GP10G/1N5 060 0LUA3 1N5060 A6CR860 152–00[...]

Replaceable Electrical Parts 8–96 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6Q160 151–0188–00 TRANSISTOR,SIG:BIPOLAR,PNP ,40V ,200MA,250MHZ, AMPLIFIER,2N3906,T O–92 EBC 04713 2N[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–97 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6Q467 151–0190–00 TRANSISTOR,SIG:BIPOLAR,NPN,40V ,200MA,300MHZ, AMPLIFIER,2N3904,T O–92 EBC 04713 2N3[...]

Replaceable Electrical Parts 8–98 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6Q739 151–0190–00 TRANSISTOR,SIG:BIPOLAR,NPN,40V ,200MA,300MHZ, AMPLIFIER,2N3904,T O–92 EBC 04713 2N3[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–99 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R157 322–3164–00 RES,FXD,FILM:499 OHM,1%,0.2W 57668 CRB20T68EFX4990 A6R158 322–3164–00 RES,FXD,FIL[...]

Replaceable Electrical Parts 8–100 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R234 322–3164–00 RES,FXD,FILM:499 OHM,1%,0.2W 57668 CRB20T68EFX4990 A6R235 322–3289–00 RES,FXD:ME[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–101 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R296 322–3226–00 RES,FXD:MET AL FILM,2.21K OHM,1%,0.2W 57668 CRB20T68EFX221 1 A6R297 322–3210–00 [...]

Replaceable Electrical Parts 8–102 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R368 322–3097–00 RES,FXD,FILM:100 OHM,1%,0.2W 57668 CRB20T68EFX1000 A6R369 31 1–2230–00 RES,V AR,[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–103 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R441 322–3273–00 RES,FXD:MET AL FILM,6.81K OHM,1%,0.2W 57668 CRB20T68EFX681 1 A6R442 322–3281–00 [...]

Replaceable Electrical Parts 8–104 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R513 322–3193–00 RES,FXD:MET AL FILM,1K OHM,1%,0.2W 57668 CRB20T68EFX1001 A6R514 322–3097–00 RES,[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–105 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R602 322–3289–00 RES,FXD:MET AL FILM,10K OHM,1%,0.2W 57668 CRB20T29EFX1002 A6R603 322–3289–00 RES[...]

Replaceable Electrical Parts 8–106 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R726 308–0549–00 RES,FXD,WW:6.3K OHM,1%,3W 54294 LA461–6.3 KOHM +–1PERCENT A6R728 308–0549–00[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–107 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R841 322–3222–00 RES,FXD:MET AL FILM,2K OHM,1%,0.2W 57668 CRB20T68EFX2001 A6R842 322–3097–00 RES,[...]

Replaceable Electrical Parts 8–108 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6U21 1 156–1200–00 IC,LINEAR:BIFET ,OP–AMP ,QUAD,TL074CN/LF347N/MC 34004P ,DIP14.3 01295 TL074CN A6U[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–109 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number 136–0925–00 SOCKET ,DIP::PCB,24 POS,2 X 12,0.1 X 0.3 CTR,0.196 H X 0.130 T AIL,BECU,TIN,ACCOM 0.008–0[...]

Replaceable Electrical Parts 8–1 10 1780R-Series Service Manual[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–1 1 1 Replaceable electrical parts list (cont.) Component number T ektronix part number Serial no. effective Serial no. discont’d Name & description Mfr . code Mfr . part number A7 671–0468–10 CIRCUIT BD ASSY :OSCILLA TOR,NTSC (1780R ONL Y) 80009 671–0468–10 A7 671–0989–[...]

Replaceable Electrical Parts 8–1 12 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7C225 281–0758–00 CAP ,FXD,CERAMIC:MLC,15PF ,20%,100V 04222 SA102A150MAA A7C226 281–0775–01 CAP ,[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–1 13 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7C308 281–0773–00 CAP ,FXD,CERAMIC:MLC,0.01UF ,10%,100V 04222 SA101C103KAA A7C31 1 290–0943–00 CA[...]

Replaceable Electrical Parts 8–1 14 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7C395 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.1UF ,20%,50V 04222 SA105E104MAA A7C396 281–0775–01 CAP ,[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–1 15 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7CR152 152–0269–00 SEMICOND DVC,DI:VVC,SI,35V ,33PF A T 4V ,DO–7 1N5450 F AMIL Y 04713 PG1 151 A7CR[...]

Replaceable Electrical Parts 8–1 16 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7L202 108–1212–00 INDUCTOR,FXD:CUST OM,SIGNAL,9UH,2%,IDC<300 MA,RDC<1.6 OHM,Q>60@4MHZ,SRF>[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–1 17 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7Q387 151–0221–00 TRANSISTOR,SIG:BIPOLAR,PNP ,12V ,80MA, SWITCHING,MPS4258,T O–92 EBC 04713 MPS4258[...]

Replaceable Electrical Parts 8–1 18 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7R209 322–3147–00 RES,FXD,FILM:332 OHM,1%,0.2W 57668 CRB20 FXE 332E A7R210 322–3034–00 RES,FXD,FI[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–1 19 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7R289 322–3269–00 RES,FXD,FILM:6.19K OHM,1%,0.2W 91637 CCF50–6191F–R36 A7R290 322–3269–00 RES[...]

Replaceable Electrical Parts 8–120 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7R355 315–0396–00 RES,FXD,FILM:39M OHM,5%,0.25W 50139 CB3965 A7R361 322–3139–00 RES,FXD,FILM:274 O[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–121 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7R423 322–3210–00 RES,FXD:MET AL FILM,1.5K OHM,1%,0.2W 57668 CRB20 FXE 1K50 A7R424 322–3210–00 RES[...]

Replaceable Electrical Parts 8–122 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7TP148 214–4085–00 TERM,TEST POINT :0.070 ID,0.220 H,0.063 DIA PCB,0.015 X 0.032 BRASS,W/ RED NYLON CO[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–123 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7U307 156–1852–00 IC,DIGIT AL:HCMOS,GA TE,HEX INVERTER,UNBUFFERED,74HCU04,DIP14.3,TUBE 04713 MC74HCU04[...]

Replaceable Electrical Parts 8–124 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7VR196 152–0195–00 DIODE,ZENER:5.1V ,5%,0.5W ,5.0MA IZT ,1N5993B/BZX55C5V1,DO–35 04713 SZ1 1755RL A7[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–125 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8 672–1283–02 CIRCUIT BD ASSY :INPUT & BNC,NTSC (1780R ONL Y) 80009 672–1283–02 A8 672–1305?[...]

Replaceable Electrical Parts 8–126 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8C278 290–0848–00 CAP ,FXD,ALUM:47UF ,20%,16V ,ESR=7.05 OHM(120HZ,25C),10X12MM,RADIAL. 62643 CEBPM1E47[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–127 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8C521 281–0812–00 CAP ,FXD,CERAMIC:MLC,1000PF ,10%,100V 04222 SA101C102KAA A8C525 290–0974–00 CAP [...]

Replaceable Electrical Parts 8–128 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8CR295 152–0141–02 DIODE,SIG:UL TRA F AST ,40V ,150MA,4NS,2PF ,1N4152,DO–35 01295 1N4152R A8CR307 15[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–129 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8Q251 151–1059–00 TRANSISTOR,SIG:JFET ,N–CH,10V ,30MA(MIN), 30OHM,300MW ,MPF4391,TO–92 DSG 04713 M[...]

Replaceable Electrical Parts 8–130 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8R132 322–3481–00 RES,FXD,FILM:1M OHM.1%,0.2W 57668 CRB20 FXE 1M00 A8R147 322–3265–00 RES,FXD:MET [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–131 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8R278 322–3258–00 RES,FXD:MET AL FILM,4.75K OHM,1%,0.2W 56845 CCF50–4751F–R36 A8R279 322–3105–[...]

Replaceable Electrical Parts 8–132 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8R356 322–3201–00 RES,FXD:MET AL FILM,1.21K OHM,1%,0.2W 57668 CRB20T68EFX121 1 A8R357 322–3251–00 [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–133 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8R433 315–0755–00 RES,FXD,FILM:7.5M OHM,5%,0.25W 50139 CB7555 A8R434 322–3431–00 RES,FXD,FILM:301K[...]

Replaceable Electrical Parts 8–134 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8U217 156–0048–05 IC,LINEAR:BIPOLAR,TRANSIST OR ARRA Y ,(5),NPN, (1)DIFFP AIR,(3)IND,15V ,50MA,300MHZ,[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–135 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8A1J3 131–0955–00 CONN,RF JACK:BNC,50 OHM,FEMALE 00779 87–3334–017 *A TTACHED P ARTS* 210–0013?[...]

Replaceable Electrical Parts 8–136 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A9 671–0463–02 B030488 CIRCUIT BD ASSY :FRONT TOUCH PNL 80009 671–0463–02 A9 671–0463–03 B03048[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–137 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A9DS428 150–1 168–00 DIODE,OPT O:LED,940NM,100MW ,50MA IF ,5V REVERSE,1.4VF A T 20MA,100PF ,SE308T 4T16[...]

Replaceable Electrical Parts 8–138 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A9Q283 151–0848–00 TRANSISTOR,OPT O:DETECTOR,940NM,VISIBLE LIGHT FIL TER,30VVCEO,100MW ,100NA DARK CURR[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–139 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A9S188 260–2675–00 B030489 SWITCH,PUSH:SPST ,MOM,NO,150 GRM FRC,SEALED,50MA,24VDC,100M OHM,W/GRN LED 20[...]

Replaceable Electrical Parts 8–140 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A9S291 260–2673–00 B030489 SWITCH,PUSH:SPST ,MOM,NO,150 GRM FRC,SEALED,50MA,24VDC,100M OHM,W/GRN LED 20[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–141 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A9U297 156–1 191–00 IC,LINEAR:BIFET ,OP–AMP ,DUAL, TL072CN/LF353N,DIP08.3 01295 TL072CP A9U495 156–[...]

Replaceable Electrical Parts 8–142 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A10 671–0925–01 B030488 CIRCUIT BD ASSY:MPU ANNEX 80009 671–0925–01 A10 671–0925–02 B030489 CIR[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–143 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A10R208 322–3093–00 RES,FXD,FILM:90.9 OHM,1%,0.2W ,MI,SMALL BODY 91637 CCF50–90R9F–R36 A10R209 322?[...]

Replaceable Electrical Parts 8–144 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A10U420 156–1917–00 IC,DIGIT AL:LSTTL,REGISTER,8–BIT SHIFT ,OUTPUT LA TCH,74LS595,DIP16.3,TUBE 01295 [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–145 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1 1 671–0469–03 CIRCUIT BD ASSY :INTERCONNECT 80009 671–0469–03 A1 1J1 16 131–5531–00 CONN,HDR[...]

Replaceable Electrical Parts 8–146 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1 1R127 31 1–2442–02 RES,V AR,PNL:CP ,10K OHM,10%,0.5W ,LINEAR,CONTIN - UOUS ROT A TION,0.5 SQ,2.0 LON[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–147 Replaceable electrical parts list (cont.) Component number T ektronix part number Serial no. effective Serial no. discont’d Name & description Mfr . code Mfr . part number A12 671–0462–01 B030488 CIRCUIT BD ASSY:FRONT SW PNL 80009 671–0462–01 A12 671–0462–02 B030489 [...]

Replaceable Electrical Parts 8–148 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A12DS206 150–121 1–00 L T EMITTING DIO:GREEN,2.0V 50434 HLMP–2516 *A TTACHED P ARTS* 361–1484–00 [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–149 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number 361–1484–00 SP ACER,LED:NYLON 0JR05 361–1484–00 *END A TTACHED P ARTS* A12DS304 150–121 1–00 L [...]

Replaceable Electrical Parts 8–150 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A12DS334 150–121 1–00 L T EMITTING DIO:GREEN,2.0V 50434 HLMP–2516 *A TTACHED P ARTS* 361–1484–00 [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–151 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A12S105 260–2401–00 B030488 SWITCH,PUSH:SPST ,MOM,NO,150 GRM FRC,SEALED,50MA,24VDC,100M OHM,B3E–1000 [...]

Replaceable Electrical Parts 8–152 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A12S225 260–2401–00 B030488 SWITCH,PUSH:SPST ,MOM,NO,150 GRM FRC,SEALED,50MA,24VDC,100M OHM,B3E–1000 [...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–153 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A12S405 260–2401–00 B030488 SWITCH,PUSH:SPST ,MOM,NO,150 GRM FRC,SEALED,50MA,24VDC,100M OHM,B3E–1000 [...]

Replaceable Electrical Parts 8–154 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A13 671–0548–01 B030488 CIRCUIT BD ASSY:VECT ORSCOPE GRA TICULE LIGHTS 80009 671–0548–01 A13 671–[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–155 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A14 671–0549–01 B030488 CIRCUIT BD ASSY:W A VEFORM MONITOR GRA TICULE LIGHTS 80009 671–0549–01 A14 [...]

Replaceable Electrical Parts 8–156 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A15 671–0547–04 CIRCUIT BD ASSY :FIL TER 80009 671–0547–04 A15C100 283–0177–00 CAP ,FXD,CER DI:[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–157 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A15CR300 152–0066–00 DIODE,RECT :400V ,1A,IFSM=30A, 1.2VF ,2US,GP10G/1N5060 0LUA3 1N5060 A15CR310 152?[...]

Replaceable Electrical Parts 8–158 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A15U251 156–2992–00 IC,MEMOR Y :CMOS,SRAM,2K X 8,35NS,OE,DIP24.3 62786 HM6716P–35 A15U260 156–2992?[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–159 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A15U470 156–1722–00 IC,DIGIT AL:FTTL,GA TE,HEX INVERTER,74F04,DIP14.3,TUBE 04713 MC74F04N A15W121 131?[...]

Replaceable Electrical Parts 8–160 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A16 671–0882–04 CIRCUIT BD ASSY :WA VEFORM HV 80009 671–0882–04 A16C100 290–0939–00 CAP ,FXD,EL[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–161 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A16C562 281–0819–00 CAP ,FXD,CERAMIC:MLC,33 PF ,5%,50V 04222 SA102A330JAA A16CR140 152–0061–00 DIOD[...]

Replaceable Electrical Parts 8–162 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A16L560 108–1450–00 INDUCTOR,FXD:SIGNAL,5.6UH,10%,IDC<0.5 A,RDC<0.4 OHM,Q>45@7.96MHZ,SRF>40[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–163 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A16R122 31 1–2239–00 RES,V AR,TRMR:CERMET ,100K OHM,20%,0.5W,0.197 SQ,TOP ADJUST TK2073 GF06UT2 104 M L[...]

Replaceable Electrical Parts 8–164 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A16R440 315–0155–00 RES,FXD,FILM:1.5M OHM,5%,0.25W TK1727 SFR25 2322–181–63106 A16R441 322–3165?[...]

Replaceable Electrical Parts 1780R-Series Service Manual 8–165 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A17 671–0883–04 CIRCUIT BD ASSY :FUSE 80009 671–0883–04 A17C310 285–1222–00 CAP ,FXD,PLASTIC:0.[...]

Replaceable Electrical Parts 8–166 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number CHASSIS P ARTS B1 1 19–1545–03 FAN,TUBE AXIAL:12V , 1.56W,37CFM,80 MM, W/SOLID MOUNTING FLANGES 80009 1[...]

Diagrams and Circuit Board Illustrations This section contains the troubleshooting procedures, block diagrams, circuit board illustrations, component locator tables, waveform illustrations, and schematic diagrams. Symbols Graphic symbols and class designation letters are based on ANSI Standard Y32.2-1975. Abbreviations are based on ANSI Y1.1-1972. [...]

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SCHEM LOCA TION CIRCUIT NUMBER C103 B2 C126 B4 C208 D1 C218 B2 C221 B2 C222 G1 C223 B2 C230 D3 C231 D3 C242 B4 C245 B3 C246 G3 C247 B3 C307 D1 C313 D1 C319 F1 C336 D3 C343 F3 C41 1 E2 C412 F2 C424 B3 C435 E4 C436 F4 C448 B3 C504 A5 C505 B5 C512 F2 C519 G2 C520 G2 C521 F2 C525 B3 C535 F4 C541 G4 C542 G4 C543 F4 C548 B3 CR212 C2 CR224 D2 CR235 C4 CR2[...]

TL072 R311 301.0 +12VE VIDEO AMPLIFIER C307 .001UF CR307 R307 301.0 +12VE +12VE PA NE L REAR CH-A J8 L116 48NH C218 .1UF R114 37.4 1 CR212 D-0141 1 10 9 2 5 6 K213 R115 1.00M AC/DC +12VE C208 47UF R203 6.2M Q204 R223 6.19K R211 20.0K R209 121.0 R210 562.0K R315 100.0 1 2 3 4 5 U217D CA3046 +12VE C313 56PF Q315 R312 221.0 GAIN A DC R319 316.0 R323 5[...]

SCHEM LOCA TION CIRCUIT NUMBER C150 B2 C173 B5 C255 D1 C266 B2 C268 B3 C269 G1 C270 B3 C278 D4 C289 B4 C291 B3 C292 B3 C293 G4 C354 D1 C360 D1 C367 F1 C379 D3 C383 D4 C390 F4 C459 E2 C460 F2 C472 B3 C482 E5 C483 F5 C495 B3 C559 F2 C564 G2 C565 G2 C566 F2 C571 B3 C583 F5 C588 G4 C589 G4 C590 F4 C595 B3 CR268 C2 CR271 D2 CR283 C4 CR295 D4 CR355 D1 CR[...]

+12VC R358 301.0 VIDEO AMPLIFIER CR355 D-0141 C354 .001UF +12VC +12VC R354 301.0 PA NE L REAR CH-B2 J4 L163 48NH C266 .1UF R165 37.4 CR268 D-0141 1 10 9 2 5 6 K261 AC/DC +12VC R166 1.00M C255 47UF Q251 Q-1059 R250 6.2M +12VC R256 121.0 R258 562.0K R257 20.0K R270 6.19K R361 100.0 1 2 3 4 5 U264D CA3046 C360 56PF Q362 Q-0719 R359 221.0 GAIN B2 DC R3[...]

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SCHEM LOCA TION CIRCUIT NUMBER A2 C1 1 13 F2 C1 1 16 G2 C1 1 18 F1 C121 1 F3 C1212 F3 C1213 F4 C1216 G4 C1220 G4 C1221 H4 C1222 G2 C1312 F4 C1313 G4 J1203 E2 L1220 H4 Q1 1 10 F3 Q1 1 1 1 F2 Q1 1 13 F2 Q1 1 15 G2 Q1215 F4 Q1218 F2 Q1309 G4 Q1315 G5 R1 106 E2 R1 107 F2 R1 108 F2 R1 109 F3 R1 1 10 F2 R1 1 1 1 F1 R1 1 12 F3 R1 1 13 F2 R1 1 14 F2 R1 1 1[...]

SHIELD BOX C297 10UF -12VDCPL R397 20.0 PROBE INPUT AMPLIFIER +12V R490 3.32K 6.2V BEC Q492 Q390 Q295 GAIN TO TP389 APPROX. 1.15 (X1) Q390 Q-0712 VR390 D-0166 C391 .1UF +12V 2 TP389 1 2 1 2 P389 1 2 J389 AND 11.5 (X10) Q294 Q-0190 C392 4.7PF R395 *SEL +12V -12V R393 1.00K R394 82.5 R392 2.21K R298 2.21K R391 100.0 R390 47.5 SDG Q493 Q493 Q-1025 Q49[...]

SCHEM LOCA TION CIRCUIT NUMBER C1024 C1 C1029 C1 C1036 D1 C1040 D1 C1 131 A3 C1232 A3 C1329 A2 C1426 C5 C1440 E5 C1441 H5 C1443 F4 C1536 F3 C934 B1 C936 E1 CR1022 B1 CR1040 D1 CR1430 E4 CR1433 D5 CR1435 E3 CR1444 G4 CR1445 G3 CR1525 E2 CR1526 F2 CR1530 F4 CR1534 F3 CR1540 G5 CR1544 G5 CR1545 G5 J1 F5 J1 133 A3 J1231 A3 J1322 A1 J1331 A2 J1446 H3 J2[...]

– AMPLIFIER +12V1 TP1130 C1036 .1UF -12V1 R1037 332.0 R1038 332.0 R1044 10.0 + AMPLIFIER Q1025 Q-0719 +12V1 R1028 332.0 R1023 22.1 R1029 100.0 CR1022 D-0141 C934 .1UF +12V1 R1021 332.0 R934 10.0 <1> H2 J1322 CONNECTS A8 INPUT BOARD SIG A TO P1322 & BNC 1 2 J1322 2 VOL TS P-P 1 <7> E2 SEL_A+ -12V1 R1321 953.0 R1420 1.00K R1322 100.[...]

SCHEM LOCA TION CIRCUIT NUMBER C1028 E5 C1041 D1 C1042 D1 C1046 E2 C1047 E2 C1 134 B1 C303 G5 C825 D5 C826 E2 C829 D2 C830 D3 C831 D2 C832 C2 C835 B1 C836 B1 C837 F4 C838 E4 C842 G4 C844 D4 C845 D4 C848 D3 C852 D3 C918 A4 C922 B4 C929 A3 C930 D2 C931 B1 C932 B1 C941 C1 C945 C3 C946 C3 C947 D1 C948 F2 C950 D3 C951 F2 CR1031 E5 CR302 F5 CR721 G5 CR72[...]

+12V1 CR928 +12V1 R928 4.99K R929 2.00K FLA T 6.2V C836 .1UF +12V1 VR936 C835 10UF R835 47.5 DIFFERENCE AMPLIFIER D1 <4> E1 SIGNAL_+ R1036 750.0 LF CMR C1134 4700PF R1033 250 1 5 1 2 1 3 89 1 8 1 6 15 1 7 1 4 7 4 2 U935 H2243 +12V1 -12V1 R1134 487.0 R1032 887.0 LOWP ASS 6.2V 1 TP936 C932 .1UF C931 10UF +12V1 -12V1 R932 47.5 R939 2.00K R933 60[...]

SCHEM LOCA TION CIRCUIT NUMBER C212 G4 C318 G4 C320 E3 C410 B3 C41 1 B4 C412 B3 C414 C3 C415 E4 C418 F4 C422 F3 C423 F3 C429 F1 C435 E1 C522 E2 C523 F3 C527 F1 C533 F2 C609 D4 C610 D4 C61 1 D4 C614 C4 C620 B5 C630 E1 C634 E2 C725 B5 CR403 F5 CR407 E5 CR408 F5 CR409 F5 CR410 E5 CR521 D3 CR522 F2 CR625 B5 L339 E1 L427 F2 L437 E1 L519 C3 L615 B5 L626 [...]

TO CRT VERTICAL CONNECTS BLUE CRT+ +30V R437 1K C435 .1UF R637 1K L638 2.7UH L437 2.7UH L339 64UH +60V DEFLECTION AMP L626 2.7UH R527 1.00K ORTHOGONALITY OUTPUT HF RESP COMP C630 27PF R534 100 Q630 Q628 Q635 +12V1 R629 150.0 R631 61.9 R636 100.0 R535 61.9 R630 4.12K H3 <11> C533 51PF L427 2.7UH C429 27PF R536 100K C527 2-18PF Q427 Q428 Q433 Y[...]

SCHEM LOCA TION CIRCUIT NUMBER C1003 B1 C101 1 E4 C1016 F4 C1019 H4 C1 1 17 E4 C1414 C1 C1415 C2 C1517 B5 C713 C4 C812 C4 C817 C4 C913 F5 CR101 1 G4 CR1 1 1 1 G4 CR1304 B5 CR1312 C1 CR1313 C1 CR1405 B5 CR912 E4 CR913 D4 J1 103 H1 J1406 D5 J9 H1 P1 103 H1 Q1304 B5 Q1415 C1 R1005 G4 R1006 G4 R1007 D4 R1008 D4 R1009 G4 R1010 G4 R1012 E5 R1013 G4 R1016[...]

U1019A 1 2 3 4 5 LINE STROBE OUT REAR PA NE L J1103 LINE STROBE 1-2 LINE SELECT 2-3 FIELD 1 PULSE P1103 C2 SEL_GND- A 1 B 2 C 3 G1 6 G2A 4 G2B 5 Y0 15 Y1 14 Y2 13 Y3 12 Y4 11 Y5 10 Y6 9 Y7 7 U1523 74HCT238 SEL_B1- C1414 15PF Q1415 A- B- +5VD C1003 .1UF +5VD +5VD R1414 6.19K R1105 10.0K INPUT <12> <12> CLK[0..2] ED_[0..7] SELECTION B1 C3[...]

C1010 B3 C1066 D4 C1067 B3 C1070 B4 C1071 B3 C1072 B3 C1075 F3 C1079 F3 C1 160 G5 C1 171 D3 C1 179 E3 C1247 E5 C1251 D5 C1252 E5 C1254 F4 C1267 B5 C1272 A5 C1276 D3 C1281 E3 C1365 C5 C1370 C2 C1374 C1 C1379 D1 C1380 D1 C1381 D1 C1383 E1 C1467 C2 C1473 C1 C1477 D1 C1480 D2 C1489 F1 C1570 B2 C1571 B1 C1575 B1 C1582 G1 C865 A4 C965 A4 C966 A3 C967 B4 [...]

1 +14V POWER SUPPL Y REFERENCE SYNC SEP ARA TOR LOW P ASS FIL TER Q1475 +12V2 R1575 100.0 1 H4 <4> R1570 887.0 R1576 887.0 C1575 87PF REF_VIDEO C1571 77PF C1374 130PF C1473 47PF +12V2 +12V2 -12V2 R1474 2.21K R1475 806.0 R1473 806.0 R1472 100.0 R1467 100.0 NC C1379 47UF C1381 .22UF C1380 10UF C1477 .1UF Q1374 +14V +12V2 -12V2 R1374 2.21K R1476[...]

C196 B3 C198 C3 C285 D2 C287 C2 C290 E2 C380 B2 C390 D2 C495 E3 C496 F3 C767 B5 C771 C5 C855 G4 C858 G4 C861 E5 C870 C5 CR385 D2 CR386 D2 CR392 E2 J192 B1 J858 G5 J865 D4 J866 D4 J867 D4 P192 B1 P858 G5 P865 D4 P866 D4 P867 D4 Q282 C2 Q385 D2 Q391 E2 Q861 F5 R180 C1 R187 C1 R196 B3 R197 C3 R281 B2 R282 B2 R283 C1 R285 D2 R286 C2 R287 C2 R288 F2 R29[...]

74HC04 74HC04 B5 DIR_REMSYNC 1 R187 200.0 9 10 8 U185C 74HC00 12 13 11 U185D 74HC00 REF OR REMOTE SYNC SWITCH B4 G2 <8> COMP_SYNC /REM_SYNC_EN J147-4 J147-6 <12> <12> REMOTE SYNC POLARITY B3 J192 1-2 POSITIVE 2-3 NEGATIVE 123 J192 P192 REM_SYNC 1 2 U190A 74HC04 11 10 U190E /DIR_REMSYNC_EN +5VD R283 20.0K R180 500.0 1 2 3 U185A 74H[...]

SCHEM LOCA TION CIRCUIT NUMBER C394 E3 C485 E4 C587 E2 C593 F2 C690 E2 C693 F4 C786 D1 C793 C4 C795 B5 CR485 E2 CR488 E2 CR590 F2 CR592 F4 CR775 D1 CR777 D2 CR778 D1 CR795 B4 J585 G3 J694 B4 P585 G3 P694 B4 Q361 C3 Q386 E4 Q589 E2 Q686 F4 R363 D3 R387 E4 R388 D4 R394 D4 R463 C3 R485 F3 R486 F3 R487 E3 R488 E3 R489 E3 R490 E3 R492 D3 R493 D3 R581 G3[...]

74HC04 SWITCH BLANKING RETRACE & +5VD B4 <12> LINESEL_RETR LINE SWEEP GA TING 1 2 3 U775A 74HC32 1 2 3 U780A 74C08 NC E3 <7> C786 270PF SWITCH_BLANK +5VD R786 3.57K 12 13 11 U775D 74HC32 C X 1 4 R X 1 5 A 1 B 2 C L 3 Q 13 Q 4 U789A 74HC221 B2 <11> LINE RAMP CR775 D-0141 CR778 D-0141 CR777 D-0141 RETRACE_&_SWITCH_BLK END OF[...]

SCHEM LOCA TION CIRCUIT NUMBER C267 F2 C352 G2 C368 F2 C381 B5 C469 D3 C474 C3 C477 C3 C478 C3 C482 A1 C549 G3 C571 D3 C572 D3 C575 D3 C576 A2 C580 C2 C586 B4 C649 G4 C651 G2 C670 D2 C675 C1 C765 B2 CR251 F2 CR252 F3 CR377 D3 CR469 E3 CR566 E4 CR573 D2 CR577 C2 CR579 B2 CR581 B2 CR582 A2 CR651 G2 CR667 F3 CR672 A3 CR673 A3 CR675 C1 Q267 F2 Q354 E3 [...]

74HC04 J130-2 B1 <12> /W_RO_EN 1 4 12 1 3 U580C CA3046 B3 C482 .1UF -2.2V W A VEFORM BLANKING 8.2V J147-22 B5 <12> VR578 D-0217 /WFM_BLANK +5VD R681 2.21K R679 2.21K R675 1.00K 1 1 9 1 0 U580B CA3046 8 6 7 U580A CA3046 J130-22 B2 <12> E3 <12> C675 51PF CR675 T_CUR+LN_SEL CURS_SEL +5VD R676 30.1K R680 4.99K 12 13 11 U780D 74C[...]

SCHEM LOCA TION CIRCUIT NUMBER C248 G1 C250 G1 C252 G2 C707 H4 C708 H4 C710 H3 C71 1 G3 C808 H3 C810 H3 C906 H2 C907 H5 C908 H4 J130 A1 J147 A3 R231 E2 R232 E2 R255 G2 R256 G2 R710 G3 R808 G3 U207 C3 U217 D2 U220 D1 U231 E1 U245A G2 U245B G1 U245C G1 U251B G1 U251C G2 U251D G1 U274 D4 U275 D5 U605A H4 U605B H3 U605C H3 U605D H4 U705 D3 U708 F2 U810[...]

SAMPLE & HOLDS DAC LA TCHES VECT_GAIN <7> A1 ED_[0..7] <6> H4 V_RO_DATA_WFM 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 J130 CONNECTS J130 <11> D1 <14> F4 <15> G5 FIELD_1 SYN[...]

SCHEM LOCA TION CIRCUIT NUMBER C758 E5 CR1060 F4 CR1061 F4 CR1 141 E4 CR1 142 D4 CR1 150 D3 CR1 151 E3 CR1365 F3 CR1366 F3 CR1588 B4 CR1593 B4 CR1597 B3 CR358 F2 CR359 G2 CR458 E2 CR459 E2 CR462 D2 CR463 E2 CR559 D2 CR658 D1 CR659 E1 L157 E5 L758 E5 Q1586 G4 Q658 D1 R1577 G5 R1578 G5 R1583 G3 R1584 G4 R1585 G4 R1586 G3 R1589 C4 R1590 B4 R1591 C4 R1[...]

CR658 D-0141 Q658 Q-0188 +12V2 F1 SLOW SWEEP TRIGGER 3 2 1 4 1 1 U458A TL074 +12V2 R761 200K <8> AGC_VIDEO TRIG LEVEL SLOW SWEEP <12> SLW_SWP_+/- E5 C661 .1UF 5 6 7 U458B TL074 -12VDCPL -12VDCPL R663 121.0K 3 4 U260B 74HC04 C457 .1UF C557 .1UF CR559 D-0141 C660 10UF +12V2 +12V2 R658 100.0K R656 1.00M R659 1.00M R559 4.75K R661 5.62K R66[...]

SCHEM LOCA TION CIRCUIT NUMBER C875 B3 C969 D2 J1081 E2 J1085 F3 J870 C2 P1081 E2 P1085 F3 Q969 D2 Q970 D2 R1070 D2 R1085 F3 R872 B4 R968 C2 R969 D2 R970 D2 R985 E2 TP981 F3 U975A B3 U975B B4 U977 C3 U980 E3 U985A F2 U985B G2 A2 W aveform Board <14> Component Locator A2 W aveform Board <14> Component Locator[...]

OSCILLA TOR PHASE CONTROL E5 <15> FLOP1 +5VD E5 <15> FLOP2 H4 +5VD D 2 Q 5 CK 3 Q 6 P R 4 C L 1 U985A 74HC74 D 12 Q 9 CK 11 Q 8 P R 1 0 C L 1 3 U985B 74HC74 <15> J1081 FRAME PULSE SELECT 1-2 INTERNAL 2-3 EXT VIDEO 1 2 3 J1081 P1081 SYNC_GATE +5VD +5VD R985 1.00K Q969 Q-0190 Q970 Q-0190 C969 .001UF +5VD +12V2 R1070 10.0K R970 10.0K[...]

SCHEM LOCA TION CIRCUIT NUMBER C991 G1 C1086 E3 C1090 G1 C1091 E3 C1093 H1 C1094 E3 C1 194 E3 C1 195 C3 C1284 C4 C1287 D3 C1288 D3 C1291 D3 C1347 B2 C1351 E2 C1364 G3 C1386 B3 C1390 B3 C1391 B4 C1394 D5 C1395 E4 C1397 C5 C1490 H1 C1497 H1 C1550 B1 C1553 D2 C1554 D1 C1555 D2 C1560 D1 C1561 D1 C1563 D1 CR1259 G1 CR1288 D3 CR1357 F3 CR1358 F2 CR1360 G[...]

C1490 .1UF C1497 .1UF +5VD +5VD 50% PT C1093 .1UF C991 1UF C1090 1UF +5VD +5VD +5VD COMPARA TOR +12V2 +12V2 R1457 825.0 R1352 3.92K R1354 2.00K R1353 2.00K SYNC 50% DETECTOR IN 2 S/H 14 VLC 13 OUT 7 NUL 4 +V 9 HOLD 11 N/C 12 N/C 10 NUL 3 -V 5 U1460 SMP-11F C1561 .1UF 50%_PT_OUT +12V2 X8 GAIN CLAMPED AMP +12V2 R1450 1.00K Q1551 OFFSET SCH C1550 .1UF[...]

SCHEM LOCA TION CIRCUIT NUMBER C135 G3 C137 H3 C140 H3 C142 G4 C145 H4 C240 H4 C335 G4 C336 H4 C342 H4 C344 G4 C433 B3 C434 B2 C440 H4 C445 H4 C450 G4 C534 H4 C540 A5 C541 A5 J342 B4 J344 A5 R355 E1 R360 E3 R430 A5 R431 B5 R435 B3 R436 B2 U120A E2 U120B E2 U135 G2 U137 G1 U140 G3 U142 G4 U145 G3 U340 B1 U344 A5 U345 E5 U350 E4 U535A A3 U535B A3 Y43[...]

+5V +5V <19> B1 A1 F5 A5 <17> IA[0..23] IA[0..23] LA TCH/BUFFER F1 1 61 9 60 44 43 27 26 10 32CG16 (TOP) U340 VISUAL AID <17> AD[0..15] AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD0 47 AD1 46 AD2 45 AD3 44 AD4 43 AD5 42 AD6 41 AD7 40 AD8 38 AD9 37 AD10 36 AD11 35 AD12 34 AD13 33 AD14 32 AD15 31 A16 29 A17 28 A18 27 A19 25 A20 24 A21 23 A22 22 A[...]

SCHEM LOCA TION CIRCUIT NUMBER C150 A2 C155 A2 C210 B2 C215 A3 C220 A3 C255 B3 C257 A3 C261 A3 C457 B3 J453 B1 P453 B1 R361 C5 R362 C5 R363 C4 R364 C5 R450 C3 R456 C3 R460 C4 U150 E1 U151 F1 U155 E2 U156 F2 U157 E3 U158 F3 U160 E4 U161 F4 U310 G1 U315 G2 U320 G4 U353 C1 U357 C2 U361 B4 U450A D3 U450B C3 U450C C3 U450D C3 U457 C4 U595A A5 U595B A5 A[...]

NC NC +5V +5V +5V H2 ROM <16> C1 AD[0..15] AD[0..15] ADDRESS MUL TIPLEXER IA[0..23] <16> H1 IA[0..23] J453 RAM PART SELECTION 2-3 512K RAM INSTALLED 1-2 128K RAM INSTALLED (NORM) 1 2 3 J453 P453 IA1 IA10 IA2 IA11 IA3 IA12 IA4 IA17 IA9 /COL 1A 2 1Y 4 1B 3 2A 5 2Y 7 2B 6 3A 11 3Y 9 3B 10 4A 14 4Y 12 4B 13 A/B 1 G 15 U353 74ALS158 Q0 Q1 Q2[...]

SCHEM LOCA TION CIRCUIT NUMBER C177 H4 C185 H4 C187 H4 C264 C2 C265 C2 C285 H4 C455 E5 C476 H4 C480 H4 R370 G1 R455 E4 U165 F3 U167 B3 U367 D1 U375 E1 U453A E5 U453B D5 U475 G1 U476 F1 W475 D1 Y264 D2 A5 Microprocessor Board <18> Component Locator A5 Microprocessor Board <18> Component Locator[...]

+5V PROGRAM ST A TIC 44 43 80C451 27 26 2 11 26 27 28 43 44 45 80C451 ONL Y PROCESSOR Y264 12MHZ C265 33PF W475 0 OHM EA/VP 1 X1 53 X2 52 RESET 35 INT0 38 INT1 39 T0 40 T1 41 P1.0 27 P1.1 28 P1.2 29 P1.3 30 P1.4 31 P1.5 32 P1.6 33 P1.7 34 P0.0 17 P0.1 16 P0.2 15 P0.3 14 P0.4 13 P0.5 12 P0.6 11 P0.7 10 P2.0 2 P2.1 3 P2.2 4 P2.3 5 P2.4 6 P2.5 7 P2.6 [...]

SCHEM LOCA TION CIRCUIT NUMBER C1 17 G5 C130 G5 C190 G5 C195 G4 C290 G5 C294 G3 C295 H3 C315 D3 C390 G5 C492 D1 C493 D1 C495 G5 C496 G5 C592 D1 C593 D1 CR295 G4 CR394 H3 CR395 H3 DS491 D2 DS492 D2 DS493 E2 DS494 E2 J199 F1 J495 D2 J595 F1 Q196 H4 Q197 H4 Q391 H3 Q392 G3 R188 F4 R194 G4 R195 G4 R196 G4 R197 G3 R198 G4 R199 G4 R230 B3 R293 H4 R294 H3[...]

+5V +5V NC SERIAL PORT RS422_TXL RS422_TXH RS422_RXL RS232_TX RS232_RX 1 6 2 7 3 8 4 9 5 J595 +5V R393 1.00K RS422_TXH RS422_TXL RS422_RXH RS422_RXL 7 4 5 6 3 8 1 2 U395 75179A 9 10 8 U595C 74ALS00 12 13 11 U595D 74ALS00 D0 17 D1 8 D2 16 D3 9 D4 15 D5 10 D6 14 D7 11 RXDA 19 TXDB 7 RXDB 6 A0 24 A1 1 A2 2 A3 3 RDN 5 WRN 4 CEN 22 RESET 21 X1/CLK 20 TX[...]

SCHEM LOCA TION CIRCUIT NUMBER C170 B4 C171 G4 C175 G4 C180 G4 C276 G4 C284 G4 C448 G1 C465 G3 C485 G4 C487 G4 C539 H1 C550 G4 C551 G4 C553 G4 C554 G4 C558 H3 C567 F2 C568 E2 C569 E3 C570 E3 C571 E2 C572 F1 CR545 H2 CR546 H2 CR550 G4 CR553 G4 CR564 H2 CR565 H2 R170 A4 R171 A4 R437 F1 R438 F1 R445 H2 R461 F3 R536 G1 R537 F1 R538 F1 R539 H1 R541 G2 R[...]

NC NC R537 1.00K +5V +5V R566 2.00K <21> J415-5 F1 C539 1000PF H SHAPE SAMPLE & HOLD R536 5K +12V 1 2 3 1 4 1 1 U541A TL074 IN 2 S/H 14 VLC 13 OUT 7 NUL 4 +V 9 HOLD 11 N/C 12 N/C 10 NUL 3 -V 5 U548 SMP-11F W548 0 OHM +12V R438 1.00K R437 499.0 HORIZ DAC ID0 ID1 RFB 23 DB0 17 DB1 16 DB2 15 DB3 14 DB4 13 DB5 11 DB6 10 DB7 9 DB8 8 DB9 7 DB10[...]

SCHEM LOCA TION CIRCUIT NUMBER C105 A3 C205 A3 J1 15 D2 J415 F1 J515 H1 R105 B1 R1 1 1 C1 R1 12 C1 R1 13 C1 R1 14 C1 R1 15 C2 R1 16 C2 R1 17 C2 R1 18 C2 R305 B2 R402 C4 R403 C5 R404 C4 R405 C3 R406 C3 R407 C3 R408 C4 R502 C5 R503 C4 R504 C4 R505 C3 R506 C4 R507 C3 R508 C3 R509 C3 U101 B4 U105 B1 U305 B3 A5 Microprocessor Board <21> Component [...]

NC NC NC NC NC NC NC NC NC +5V NC J415 <20> D3 CURS_SEL -15V +15V +5V +5V C4 C3 C4 C4 C4 C4 <18> INTENS_1 H_POS_1 H_POS_2 V_POS_1 V_POS_2 SCALE_1 /WLS_FIELD C3 FOCUS_1 V_SYNC REM_SYNC RGB_STAIR /REM_SYNC_EN /RGB_EN /WFM_BLANK H_RO_DATA_VEC V_RO_DATA_VEC NC NC <19> E5 <20> H1 <20> H3 +15V ED_7 +15V +15V +15V C3 E5 CLK1 [...]

 A23 A2 R1234 #     "  !$       COMPONE[...]

NC NC RL0 RL1 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 J112 |J-3364| CR107 CR106 Y0 SCANL0 RL[0..4] Y[0..7] KEYBOARD DISPLA Y A1 2 B1 18 A2 3 B2 17 A3 4 B3 16 A4 5 B4 15 A5 6 B5 14 A6 7 B6 13 A7 8 B7 12 A8[...]

 A23 A2 R1234 #     "  !$       COMPONE[...]

LUM/ X5 RIGHT DISPLA Y 8 7 6 5 4 3 2 1 DS124 FANODE0 LEFT DISPLA Y 3 12 4 S135 RIGHT DISPLA Y 3 12 4 S115 3 12 4 S125 LEFT DISPLA Y RL1 3 12 4 S105 VECT/ SCH CH A/ RL0 3 12 4 S205 PIX X Y/ PARADE/ OVERLAY CH B1/ A - B1/ INPUT 3 12 4 S225 3 12 4 S215 WFM/ WFM + CAL INT/ REF SCANL4 SCANL5 SCANL6 SCANL7 3 12 4 S235 VECT FCATH7 FANODE4 FCATH7 FANODE3 4[...]

 A23 A2 R1234 #     "  !$       COMPONE[...]

C298 .1UF 5 6 7 U297B TL072 TP_OUT +5V C288 .1UF +5V SL[0..3] TP_OUT +5V +5V +5V +5V +15V IN 3 OUT 1 G 2 U498 78L05 +5V C105 .1UF TCATH0 TANODE2 TANODE2 +5V Q113 DS106 DS206 Q120 Q128 Q136 X0 X0 X1 X2 X3 X4 X5 X6 X7 SL0 SL1 X4 X5 X6 X7 +5V +5V Q143 Q243 TOUCH P ANEL SENSITIVITY C292 680PF IN 2 OUT 3 G 1 U296 79L12 C297 .1UF -15V +5V R292 1K R295 10[...]

 A23 A2 R1234 #     "  !$       COMPONE[...]

SCHEM LOCA TION CIRCUIT NUMBER C183 F4 C184 G4 C185 G4 C188 F5 C190 F5 C288 G4 C290 E4 C292 E5 C294 F5 C464 F2 C471 E2 C474 E2 C483 H3 C484 H3 C486 H3 C562 F1 C570 E3 C571 E3 C573 E3 C576 D2 C582 B5 C682 B5 CR467 E1 CR468 E1 J574 D3 J885 A1 L287 G4 Q186 F4 Q187 F4 Q290 E4 Q291 E4 Q459 G2 Q462 G1 Q467 E1 Q468 E1 Q560 G1 Q573 E3 R183 F4 R184 F4 R185 [...]

A6 V ectorscope W aveforms and J885 Connections[...]

TO COMPASS ROSE 800mV P-P GAIN CELL 6.2V VR577 D-0461 +12V +12V R561 47.5 R477 619.0 +12V R469 4.32K 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 36 37 37 38 38 39 39 40 40 41 41 42 42 43 43 44 44 45 [...]

SCHEM LOCA TION CIRCUIT NUMBER C131 D5 C156 E1 C157 E1 C162 F2 C165 F3 C166 F3 C171 D4 C172 D4 C257 D2 C264 E5 C273 G3 C277 G3 C357 C2 C358 C2 C360 C3 C365 D3 C369 G4 C373 H3 C377 H4 C383 G5 C481 C4 C482 C5 C676 A3 Q158 E1 Q159 E2 Q160 F2 Q167 F3 Q265 D3 Q277 G3 Q278 C2 Q279 C5 Q677 B3 R130 C5 R133 C5 R155 E1 R156 E1 R157 E1 R158 E1 R159 E3 R160 E2[...]

C156 .1UF +12V <25> H1 AMP_CHROMA 1 C357 .01UF R357 1.00K DIFFERENTIAL GAIN DEMODULA TOR R257 100.0 MIRROR CURRENT C157 51PF R158 499.0 R156 150.0K R155 1.00K R157 499.0 2 1 36 4 5 Q158 Q-0261 LOW P ASS FIL TER Q160 Q-0188 C162 10UF +12V R164 4.02K R162 47.5 LIMITER +12V R161 4.99K R359 200.0 1 5 2 3 1 4 6 1 2 8 10 4 U261 1496P R258 100.0 C35[...]

SCHEM LOCA TION CIRCUIT NUMBER C324 F5 C330 F5 C350 F2 C351 E2 C420 B4 C421 B4 C450 F3 C454 E2 C456 E2 C457 G2 C521 B4 C554 F2 C555 E2 C648 F5 C659 F3 C660 G3 C661 G3 C664 H3 C693 F5 C695 C5 C747 F5 C753 F5 C756 A1 C758 A1 J321 C4 L659 G3 P321 C4 Q323 B4 Q447 F2 Q663 G3 Q665 H3 R234 F4 R322 B4 R323 B4 R324 B4 R349 F2 R350 E2 R351 D2 R352 E2 R425 A5[...]

A4 <25> +5V +5V +5V R753 1.00K R748 1.00K +V 1 IN1 3 IN2 4 -V 6 STB1 13 OUT1 11 OUT2 9 STB2 8 U757 LM361 C756 .1UF +12V <28> D4 CONTROL SIGNAL C758 .1UF AFSC1 AFSC2 -12V J885-43 1 J885-44 <25> SUBCURSE /SUBCURSE R857 100.0 R856 100.0 A 1 QA 3 QB 4 QC 5 QD 6 CLR 2 U751A 74HC393 A4 /CENTER_DOT_CLAMP /CHROMA_CLAMP SCH_BLANK I/CK 1 I [...]

SCHEM LOCA TION CIRCUIT NUMBER C1 16 E1 C1 18 G2 C120 G2 C126 F3 C136 D2 C137 C1 C140 C2 C221 G2 C225 G2 C238 B1 C336 C5 C339 C5 C341 D5 C438 B5 C443 D3 C538 F5 C641 E3 C645 D2 C738 G4 C742 G4 C744 D3 C839 G4 C843 G4 C848 D4 C849 C4 C850 D4 C851 C4 C852 C4 CR236 C2 CR237 C2 CR436 C5 CR437 C5 CR443 E3 CR444 E3 Q122 G1 Q135 D1 Q223 H2 Q239 B1 Q342 D5[...]

CENTER DOT VER TICAL VECTOR 1 Q239 Q-0188 R241 6.81K <27> E2 /CENTER_DOT_CLAMP J885-45 <25> <30> VECT_V_POS -12V R240 47.5K POSITION CLAMP A4 C1 CR236 D-0141 CR237 D-0141 C238 .01UF C137 .1UF R238 8.25K R235 10.0K R237 604.0 R141 22.1K GS D Q135 Q-1025 C136 .1UF 3 2 6 5 7 4 U138 3080E +12V +12V R134 3.32K C116 22UF C120 110PF +12V[...]

SCHEM LOCA TION CIRCUIT NUMBER C105 C4 C1 10 C4 C205 C5 C208 G4 C213 G4 C305 C3 C401 D2 C404 G4 C503 C1 C605 G4 C672 G3 C673 G3 C761 G3 C861 G3 CR671 H3 CR672 G3 CR860 G3 CR861 H3 J100 A5 J108 C4 J205 C5 Q403 C2 Q602 C1 R104 C4 R106 C4 R107 C4 R109 C4 R1 10 C4 R1 1 1 C4 R1 12 D4 R1 13 D4 R204 C5 R205 C5 R206 C5 R207 D5 R212 E4 R213 E4 R214 D4 R215 [...]

TL074 PICTURE MONITOR SWEEPS <27> E5 Q602 R601 10.0K R604 20K H_SYNC_A R603 10.0K 4V P-P C503 .01UF R606 100K 6 5 7 U506B TL074 2 3 1 4 1 1 U506A +12V -12V R602 10.0K R605 49.9K R506 20.0K R501 10.0K ~7V P-P 0V <30> E4 ~ PIX_HORIZ POST REGULA TORS ~6V P-P POS 0V <30> E2 PIX VERT ~ 9 10 8 U506C TL074 PIX_VERT +12V R406 20.0K R405 4[...]

SCHEM LOCA TION CIRCUIT NUMBER C146 C5 C148 D5 C150 D5 C153 C4 C216 B1 C218 B1 C243 B5 C248 B5 C249 B5 C251 C5 C318 B1 C319 B1 C343 E5 C344 E5 C346 F5 C41 1 E2 C412 E2 C417 F2 C529 E4 C530 E4 C537 F4 C614 G2 C627 G4 C632 B2 C634 B4 C703 C1 C733 B3 C735 C3 C803 D1 C805 C1 C818 H2 C819 H3 C832 B3 C835 C3 Q145 C5 Q246 B4 Q515 G2 Q516 F3 Q526 G4 Q527 F[...]

BUFFER R–Y C805 22PF R804 1.00K C218 *SEL R218 5.62K AMPLIFIER R–Y 1 <28> H2 C319 .1UF DEMOD_R-Y -12V R317 332.0 R315 1.10K R316 100.0 R219 499.0 <28> B2 C318 .1UF C216 .1UF VERT_CLAMP_FB +12V -12V R806 2.00K R802 1.50K 3 2 6 1 7 5 8 4 U216 EL2020 (0 +/- 2.5V) 2 J885-17 <25> A2 C703 .1UF C803 .1UF 3 2 18 6 7 4 U803 LM6361 VEC_[...]

 A23 A2 R1234 #     "  !$       COMPONE[...]

SCHEM LOCA TION CIRCUIT NUMBER C167 F1 C173 A3 C174 F1 C177 E1 C178 G1 C179 F1 C180 F1 C182 F1 C186 A3 C187 C1 C190 C3 C191 E1 C193 C1 C196 C1 C273 F2 C276 B3 C279 E3 C280 D3 C281 E1 C282 E1 C283 A3 C285 D1 C286 A3 C287 A4 C288 A4 C289 C2 C290 C2 C291 B4 C292 C4 C293 B3 C294 B3 C297 A3 C298 A1 C369 A3 C372 E4 C374 C3 C382 D3 C383 G3 C387 C4 C392 B2[...]

A7 Oscillator Board W aveforms[...]

VCXO +12V R174 1.21K C174 .1UF R279 806.0 C179 82PF SAMPLING C191 .01UF 5.1V TRANSDUCT ANCE AMPLIFIER LOWP ASS FIL TER +12V VR196 C196 100UF REF VIDEO J499 CONNECTS TO J1446 <4> H4 A2 WAVEFORM BOARD 1 2 J499 1 BANDP ASS FIL TER C392 220PF C298 100UF +12V +12V R397 909.0 R296 1.62K R197 576.0 R298 4.32K Q297 Q298 2 6 1 2 8 10 4 U193 1496P C193[...]

SCHEM LOCA TION CIRCUIT NUMBER C151 G4 C153 B2 C155 A2 C156 A2 C161 A1 C228 G4 C246 G4 C248 C2 C249 C2 C250 C2 C252 B2 C253 G2 C256 A2 C260 G1 C327 H4 C334 G5 C338 H4 C340 F4 C343 G4 C344 G4 C348 H3 C349 C2 C352 G2 C354 G3 C356 E2 C357 F3 C358 G1 C359 G1 C360 G1 C361 G1 C362 H4 C363 H4 C364 C1 C365 G1 C366 C1 C367 C1 C368 C1 C434 G5 C435 F2 C436 F2[...]

+5A +5A +5A +5A +5A +5A +5A +5A C365 330PF R260 100.0 LOWP ASS FIL TER MIXER C358 .022UF +5D1 R258 2.21K 1 2 3 7 1 4 U256A 74F86 NC F4 <31> Q_INVERT 12 13 11 U256D 74F86 ERROR AMPLIFIER C364 330PF +5A R462 825.0 1 LOWP ASS FIL TER MIXER C367 .022UF R266 2.21K R367 100.0 +5D1 1 2 3 7 1 4 U266A 74F86 H4 <31> 4 FSC +5A D 2 Q 5 CK 3 Q 6 P R[...]

SCHEM LOCA TION CIRCUIT NUMBER C131 A5 C133 B5 C139 C5 C142 B5 C143 F5 C144 A5 C149 B5 C165 F5 C202 E2 C203 E2 C206 E2 C207 F5 C209 C5 C210 E1 C212 C5 C226 F5 C259 D5 C261 D5 C302 F2 C303 A2 C304 D3 C306 B3 C307 B1 C308 B3 C31 1 D1 C350 F5 C408 B3 C412 D2 C413 C1 C414 D2 C415 D2 C416 F5 C513 C1 CR130 B5 CR139 A5 CR145 B5 CR303 A2 CR310 E1 L158 D5 L[...]

C307 .1UF +12V +12V Q409 Q-0221 Q408 Q-0221 R410 332.0 R409 332.0 C413 .1UF C513 .022UF +12V R413 4.02K 5 6 7 U415B TL072 ERROR AMPLIFIER C311 47UF C415 .1UF +12V R406 3.01K R411 150.0K R310 3.01K C210 33PF C202 56PF Q309 Q-0188 R203 10.0K CR310 VCO C302 22PF 23 24 1 Q307 Q-0190 CLOCK /CLOCK +5A R307 4.75K R305 825.0 R311 22.1 R309 22.1 11 10 U307E[...]

SCHEM LOCA TION CIRCUIT NUMBER C219 E4 C225 E4 C227 E4 C320 F4 C417 H1 C418 H1 C419 H1 C433 C4 J1 15 A2 J320 D1 P320 D1 Q322 F2 R213 E2 R214 E1 R314 E1 R315 F4 R317 E2 R318 F2 R319 F4 R320 F4 R321 F4 R322 E4 R323 F1 R324 D4 R417 H1 R418 G1 R420 F2 R421 G2 R422 H2 R423 F2 R424 G2 R426 F1 R427 F1 R428 F1 R429 G1 R430 G1 R433 C4 U217A E2 U217B E2 U217[...]

C419 .1UF +12V AL TERNA TE MODE SWITCH +12V R430 750.0 SWITCH CONTROL +5A DIFF . PHASE DISPLAY J320 P320 +5A 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 36 37 37 38 38 39 39 40 40 41 41 42 42 43 43 4[...]

 A23 A2 R1234 #     "  !$       COMPONE[...]

SCHEM LOCA TION CIRCUIT NUMBER C100 H3 C1 10 G2 C1 1 1 H2 C130 A1 C140 A1 C141 A1 C150 B1 C151 B1 C160 A1 C161 A1 C170 A1 C171 A1 C180 A1 C181 B1 C210 G2 C21 1 G2 C212 G1 C220 G1 C300 G3 C310 H3 C31 1 H1 C312 H1 C320 H1 C321 H2 C322 A1 C350 B1 C400 B1 C410 A1 C41 1 G4 C420 G4 C430 A1 C440 A1 C441 A1 C450 B1 C460 A2 C461 A2 C470 A2 CR300 G3 CR310 H3[...]

A15 Filter Board W aveforms and J310 Connections[...]

NC NC 10 3 FL TR_DEMOD +5VA W123 0 OHM R210 1.00K VCC A 40 GND D 35 VEE D 3 A IN 21 A OUT 1 DO_0 34 DO_1 33 DO_2 32 DO_3 31 DO_4 30 DO_5 29 DO_6 28 VREF 25 DO_7 27 DI_0 13 DI_1 12 DI_2 11 DI_3 10 DI_4 9 DI_5 8 DI_6 7 DI_7 6 DI_8 5 DI_9 4 A/D CLK 18 D/A CLK 15 KEY 23 LEVEL 22 PCE 20 EXT A IN 38 EXT EN 39 VEE A 2 VEE A 17 GND A 24 GND A 16 VCC A 36 V[...]

 A23 A2 R1234 #     "  !$       COMPONE[...]

SCHEM LOCA TION CIRCUIT NUMBER C164 G3 C165 G3 C197 G1 C264 H3 C265 H3 C289 G4 C291 E2 C293 H4 C299 G1 C384 E4 C385 C4 C390 B2 C391 D1 C397 F2 C399 G1 C598 F1 CR296 H2 CR394 D2 CR395 E2 CR481 C5 CR498 F2 CR597 B2 DS195 H1 DS196 H1 Q199 G1 Q298 G1 Q380 B4 Q381 C5 Q498 G2 Q499 G2 R194 H1 R195 G1 R196 G1 R197 G1 R280 B4 R291 G4 R292 E2 R293 E3 R294 D2[...]

A4 Z–Axis Board W aveforms[...]

+100V +100V R197 2.00K R196 475.0 W A VEFORM Z–AXIS AMP <40> C3 <38> A3 J180 23 28 30 /RY_SCH_BLNK /WFM_BLANK W_BLANK_EN WLS_LINE 9 10 12 13 8 U289B 74ALS20 4 5 6 U357B 74HC32 HI = BLANK W A VEFORM Z–AXIS C391 47PF R391 4.75K <38> H2 /CURSOR_LOCATE 1US C598 .1UF C397 .1UF +12V R195 100.0K R599 15.0K R396 8.06K C197 .1UF DS195 [...]

SCHEM LOCA TION CIRCUIT NUMBER C100 G1 C101 G1 C102 H4 C104 H1 C108 C2 C109 H1 C1 10 H1 C1 12 B4 C1 13 C2 C1 15 B2 C1 16 B2 C1 18 E4 C120 E4 C206 F2 C207 C3 C21 1 B4 C214 B2 C215 C2 C218 D4 C219 E5 C302 E2 C303 E2 C305 F2 C306 H4 C307 A3 C31 1 B4 C312 C2 C313 C4 C314 C5 C402 E1 C403 D2 C404 D2 C412 B3 C414 C5 C416 D4 CR204 F1 CR214 C2 CR306 C3 CR30[...]

C219 .1UF -12V 15.0K C416 .1UF -12V C104 .1UF +12V R100 511.0 CR307 D-0141 OSCILLA TOR 10MHZ C215 .1UF +5V R113 200.0 SAMPLE AND HOLD +12V PHASE DETECTOR C402 .001UF CR402 D-0141 R303 6.19K Q204 Q-0188 C206 .1UF CR204 TP108 +5V +12V R205 10.0K R206 2.00K R204 5.11K 9 10 8 U202C 74LS86 Q100 Q-0221 C100 300PF C101 600PF R104 200.0 R106 392.0 R105 5.0[...]

SCHEM LOCA TION CIRCUIT NUMBER C133 D5 C136 E5 C139 E5 C143 E5 C217 F4 C220 E5 C223 F5 C320 F5 C323 F5 C327 G5 C329 G5 C333 F5 C336 G5 C339 G5 J156 A1 J180 A1 R217 F4 U218B F4 U223A D5 U223B G3 U233 D4 U236 D2 U239 D3 U243 D1 U329 C4 U333 E2 U336 E3 U339 E4 U420A G4 U423 G4 U426 G1 U429A F1 U429B G3 A4 Z–Axis Board <38> Component Locator A4[...]

D11 D10 D9 D8 +5V +5V D7 D6 D5 D4 +5V +5V +5V +5V CURSOR & CURSOR ENABLE CURSOR VS SWEEP SYNCHRONIZA TION W_FOCUS CURSOR J156 CONNECTS TO J550 A16 WAVEFORM HIGH 1 1 2 2 3 3 J156 BOARD <42> A4 VOL TS 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 [...]

SCHEM LOCA TION CIRCUIT NUMBER C148 A2 C151 B2 C250 A1 C251 G1 C343 A1 C346 B2 C348 B2 C350 G3 C351 G1 C352 G3 C353 B1 C354 E1 C355 E1 C357 B1 C440 B1 C444 B2 C452 G2 C453 G2 C454 E2 C455 E2 C456 G4 C489 B1 C551 B1 C555 G4 C557 B1 C586 E4 C587 E4 C588 B1 C591 E3 C592 E3 R346 C3 R440 C3 R441 C3 R442 C4 R443 B2 R444 B2 R446 B3 R456 E3 R457 E2 R458 E2[...]

J180-60 <38> A5 VECT_V_POS C351 .1UF 5 6 7 U355B TL074 J156-2 <38> A1 ANAL OG MUL TIPLEXERS W_FOCUS 3 2 1 4 1 1 U451A TL074 C355 .1UF +12V +12V +12V +12V +12V C353 .1UF C343 .1UF C557 .1UF C250 .1UF C357 .1UF C440 .1UF C489 .1UF +12V +12V +12V -12V -12V -12V C588 .1UF C551 .1UF +12V +12V -12V 12 13 14 U451D TL074 C354 .1UF -12V <38&g[...]

SCHEM LOCA TION CIRCUIT NUMBER C226 A5 C263 G1 C267 G2 C269 G3 C272 G4 C361 A4 C364 F1 C366 F2 C369 F3 C372 F4 C463 A5 C469 A5 C476 D2 C478 A5 C566 A5 C571 B5 C578 B5 CR466 F1 CR467 F2 CR472 F3 CR473 F3 L261 A4 Q362 G1 Q363 G1 Q365 G2 Q366 G2 Q369 G3 Q370 G3 Q371 G4 Q372 G3 Q374 F5 Q375 F5 Q377 D5 Q378 D5 R264 G1 R270 G3 R276 F5 R277 E5 R364 F1 R36[...]

SCALE DRIVERS PULSE WIDTH MODULA TORS +12V R465 14.3K <39> H4 V_SCALE_INTENS R463 18.2K R464 4.75K VECT EXT/INT 10 9 8 U466C TL074 5 6 7 U466B TL074 R466 10.0K C364 10UF 3 2 1 4 1 1 U466A TL074 CR466 D-0141 +12V -12V R364 332.0 J180-13 J180-20 <38> <38> A2 A2 C263 100UF Q363 Q-0710 Q362 Q-0622 VECT_INT_LAMP +15VA +15VA R264 47.5K [...]

SCHEM LOCA TION CIRCUIT NUMBER C100 C3 C101 F3 C102 F3 C1 10 C2 C1 1 1 B3 C1 12 B2 C120 B2 C130 A3 C200 F4 C210 C4 C21 1 B3 C230 B1 C260 D1 C261 C2 C262 D2 C263 E2 C264 D2 C280 E2 C300 B5 C31 1 C4 C320 A3 C321 B3 C350 D3 C351 C3 C352 C3 C370 D3 C380 E4 C410 C4 C41 1 B4 C460 D2 C480 E5 CR120 A3 CR150 C1 CR151 C1 CR170 D2 CR171 D2 CR310 D5 CR320 A3 C[...]

HV CONNECTOR +9KV IN 2 OUT 3 G 1 CR151 HV SUPPL Y INDICATOR DS340 OSC 33KHZ R102 4.7 +60V C230 .01UF L110 100UH C120 10UF 5 4 3 2 1 16 15 11 6 7 8 T240 CR150 R161 15 J156 J155 -2750V POWER SUPPLIES R160 22K R162 47K R180 510 C260 .001UF DS160 C262 .01UF C261 .01UF GRID DRIVE RECTIFIER R170 22M R171 1.5M DS170 -2750V 1 1 2 2 3 3 4 4 J160 11 4 2 3 1 [...]

SCHEM LOCA TION CIRCUIT NUMBER C100 B1 C101 F4 C102 F4 C1 10 B2 C1 1 1 B2 C1 13 F4 C120 F3 C121 F3 C210 B2 C230 C1 C231 D1 C240 D2 C241 D2 C242 D1 C243 D2 C250 E3 C251 E3 C300 A2 C365 E5 C410 A1 C41 1 A1 C419 C2 C420 E4 C430 D3 C500 A3 C510 C3 C51 1 C3 C512 C2 C513 D3 C530 A4 C531 A2 C532 A2 C533 B4 C534 B3 C540 A3 C560 B4 C561 B5 C562 C4 CR140 D2 [...]

R330 HV CONNECTOR +16KV 4X IN 2 OUT 3 G 1 U220 L200 100UH R200 4.7 C100 10UF +60V Q300 MOUNTED ON CHASSIS 1 1 2 2 3 3 J300 OSC 25KHZ HV SUPPL Y INDICATOR DS300 R300 15 C411 680PF C410 .01UF 3 1 5 4 16 11 7 6 2 15 T210 T-1765 POWER SUPPLIES J130 J135 CR220 D-0409 C419 1UF R320 10.0K -3900V GRID DRIVE RECTIFIER C242 NOT INSTALLED R144 10 DS250 NOT IN[...]

SCHEM LOCA TION CIRCUIT NUMBER C100 G3 C120 F4 C121 F4 C130 F3 C132 D5 C134 E5 C135 E5 C140 D5 C141 E2 C160 C1 C170 C1 C234 E5 C240 E2 C260 A5 C270 D1 C271 D1 C300 F3 C301 G3 C310 A1 C320 F2 C321 F1 C340 E1 C350 D3 C360 A4 C361 D4 C400 F3 C410 F2 C41 1 F1 C412 F2 C420 F1 C421 F2 C450 D3 C461 B4 C462 C3 C463 B3 C540 C2 C560 B3 C561 A2 C576 D1 CR100 [...]

-8V NC NC NC NC +60V -15V +15V ANLG GND +5V CURSOR /W_FOCUS PWR_SW_1 PWR_SW_2 NC NC NC NC +160V NC NC W400 0 OHM +60V -15V +15V +160V +5VA CURSOR /W_FOCUS 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 [...]

SCHEM LOCA TION CIRCUIT NUMBER J303 E1 J308 D1 J516 H1 J531 A1 J547 A3 J565 H3 A1 1 Interconnect Board <44> Component Locator  A23 A2 R1234 #     "  ![...]

NC NC NC NC NC NC NC NC NC NC NC NC /WLS_FIELD V_SYNC /FL TR_BD /ERD +V_OUT /EWR ED_4 ED_5 ED_6 ED_7 +5V -8V NC DEMOD FL TR_DEMOD -12V NC +12V -5V /MA /BYP AS S /FL /LSE AFC_SYNC CLOCK2 /CLOCK2 CLOCK /CLOCK /DG_FL TR ED_0 ED_1 ED_2 ED_3 FIL TER EA_0 EA_1 EA_2 FIL TER 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 1[...]

SCHEM LOCA TION CIRCUIT NUMBER A1 1 J1 16 D1 J133 D4 J143 D3 J150 D2 J165 D4 J492 A1 J497 H1 S100 F5 A13 DS1 1 1 E2 DS121 E1 DS131 E2 DS141 E1 DS151 E2 P1 16 D1 S131 E1 A14 DS1 10 E3 DS120 E3 DS130 E3 DS140 E3 DS150 E4 P150 D2 S130 E3 A1 1 Interconnect Board <45> Component Locator  A23 A2 R1234 [...]

1 1 2 2 3 3 4 4 5 5 6 6 7 7 J116 J375-39 J375-42 J375-43 <46> SC3 LED_R1 SW_R1 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 36 37 37 38 38 39 39 40 40 41 41 42 42 43 43 44 44 45 45 46 46 47 47 4[...]

SCHEM LOCA TION CIRCUIT NUMBER J375 A1 J380 H1 R109 E2 R123 E3 R127 E3 R138 E4 R158 E4 R185 D4 R191 D4 R198 D3 A1 1 Interconnect Board <46> Component Locator A1 1 Interconnect Board <46> Component Locator[...]

J308-34 J308-36 J492-57 J547-22 MICROPROCESSOR <44> <45> H_RO_DATA_VEC V_RO_DATA_VEC /WFM_BLANK /DAC_SEL /ERD NC NC J303-55 J565-3 J303-54 J492-58 J565-4 J565-34 J492-17 J531-9 J531-32 <44> <44> <45> <44> <45> <44> FIELD_1 /DPS_MSB EA_1 /EWR J308-13 J308-12 J492-34 J303-53 J547-18 J547-6 J547-4 J547-2[...]

[...]

1780R-Series Service Manual 10–1 Mechanical Parts List This section contains a list of the replaceable mechanical components for this instrument. Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local T ektronix, Inc., Field Office or representative. Changes to T ektron[...]

Mechanical Parts List 10–2 1780R-Series Service Manual Using the Replaceable Mechanical Parts List T able 10–1 describes each column in the replaceable parts list. T able 10–1: Replaceable parts list column descriptions Column Name Description Fig. & Index Number Items in this column are referenced to the exploded view item numbers. T ekt[...]

Mechanical Parts List 1780R-Series Service Manual 10–3 Manufacturers Cross Index Mfr . Code Manufacturer Address City , State, Zip Code 06383 P ANDUIT CORP 17301 RIDGELAND TINLEY P ARK IL 07094–2917 07416 NELSON NAME PLA TE CO 3191 CASIT AS 0KB01 ST AUFFER SUPPLY CO 810 SE SHERMAN PORTLAND, OR 97214–4657 12327 FREEWA Y CORP 9301 ALLEN DRIVE C[...]

Mechanical Parts List 10–4 1780R-Series Service Manual Replaceable Parts List Fig. & Index Number T ektronix Part Number Serial No. Effective Serial No. Discont’d Qty Name & Description Mfr . Code Mfr . Part Number 1–1 426–2293–00 2 FRAME,CRT :ASSY ,INNER BEZEL/IR FIL TER 80009 426–2293–00 –2 378–0332–00 2 FIL TER:SMOKE [...]

Mechanical Parts List 1780R-Series Service Manual 10–5 Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No. Discont’d Serial No. Effective T ektronix Part Number –25 _____ _____ 1 CIRCUIT BD ASSY:FUSE (SEE A17 REPL) *MOUNTING P ARTS* –26 129–1308–00 2 SP ACER,POST :6?[...]

Mechanical Parts List 10–6 1780R-Series Service Manual Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No. Discont’d Serial No. Effective T ektronix Part Number –44 21 1–0721–00 13 SCREW ,MACHINE:6–32 X 0.375 PNH,STL 83486 ORDER BY DESCR *END MOUNTING P ARTS* –45 33[...]

Mechanical Parts List 1780R-Series Service Manual 10–7 Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No. Discont’d Serial No. Effective T ektronix Part Number –67 _____ _____ 1 FAN,TUBE AXIAL:12V , 1.56W ,37CFM,80 MM, W/SOLID MOUNTING FLANGES (SEE B1 REPL) *MOUNTING P ART[...]

Mechanical Parts List 10–8 1780R-Series Service Manual Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No. Discont’d Serial No. Effective T ektronix Part Number –85 337–3581–00 1 SHIELD,ELEC:HIGH VOL T AGE TRANSFORMER 80009 337–3581–00 *MOUNTING P ARTS* –86 21 1?[...]

Mechanical Parts List 1780R-Series Service Manual 10–9 Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No. Discont’d Serial No. Effective T ektronix Part Number –107 _____ _____ 1 CIRCUIT BD ASSY:VER T/HORIZ (SEE A2 REPL) *MOUNTING P ARTS* –108 21 1–0721–00 10 SCREW ,[...]

Mechanical Parts List 10–10 1780R-Series Service Manual Replaceable Parts List (Cont.) Fig. & Index Number T ektronix Part Number Serial No. Effective Serial No. Discont’d Qty Name & Description Mfr . Code Mfr . Part Number 2–1 390–1039–00 1 CAB,WRAP AROUND:1780R 80009 390–1039–00 *MOUNTING P ARTS* –2 21 1–0720–01 4 SCRE[...]

Mechanical Parts List 1780R-Series Service Manual 10–1 1 Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No. Discont’d Serial No. Effective T ektronix Part Number 016–101 1–00 1 ACCESS KIT : CABINET ,PORT ABLE:1780F02 80009 016–101 1–00 016–0475–00 1 VIEWING HOOD:[...]

Mechanical Parts List 10–12 1780R-Series Service Manual[...]

1780R–Series Figure 1 Exploded View[...]

1780R–Series Figure 2 Cabinet & Accessories[...]