JVC 250 manual

SERVICE MANUAL Model 250 Projector Phone: (760) 929-5300 Fax: (760) 929-5410 2310 Camino Vida Roble Carlsbad, California 92009[...]

ii Model 250 Service Manual DECLARATION OF CONFORMITY PER ISO/IEC GUIDE 22 AND EN 45014 Manufacturer : Hughes JVC 2310 Camino Vida Roble Carlsbad, Ca 92009 USA Hughes-JVC declares that this product conforms to the following Product Specificat ions (Directive/ Standard): Safety : EN 60950 I EC 950 (1992) EMC: EN 55022 (1988) / CI SPR-22 (1986) Class[...]

Model 250 Projector Ser vice Manual iii Table of Contents Safety Information .................................................................................... v Chapter 1 Introducti on 1.1 Safety ...................................................................................................... 1-1 1.2 Updates ................................[...]

iv Model 250 Service Manual 6.5 I R Detectors ............................................................................................ 6-4 6.6 EMI Shield ............................................................................................. 6-4 6.7 Cleaning L enses, I LA ® Assemblies, and Mirrors................................... 6-5 C[...]

Chapter 1---Introduction Model 250 Service Manual 1-1 1.0 Introductio n Contents 1.1 Safet y............................................................................................................ 1-1 1.2 Updates ......................................................................................................... 1-2 1.3 Acronyms Used .....[...]

Chapter 1---Introduction 1-2 Model 250 Service Manual When performing procedures th at call for the projector’s powe r to be on, alwa ys wear high voltage gloves (ANS I/ASTM 10,000 volt rated) when workin g around the CRTs, Arc Lamp or power supplies. Wear s afet y goggles (rated X5) when working near the light path from the Arc Lamp or at all ti[...]

Chapter 1---Introduction Model 250 Service Manual 1-3 SECAM Sequentia l couleur a memoire (sequencial color with memory SRB Scan R eversal Boa rd SYNC Synchronization TTL Transistor-Transistor L ogic UL Underwriter Laboratories UV Ultraviolet VAB Video Amplifier Board VCO Voltage Controlle d Oscillator VIC Video Input Card VIN Video Input VPB Video[...]

Chapter 2---System Description Model 250 Service Manual 2-1 2.0 Sy stem De s c r i ption Contents 2.1 Introduction .................................................................................................. 2-1 2.2 Electrical Section.......................................................................................... 2-2 Incoming Power [...]

Chapter 2---System Description 2-2 Model 250 Service Manual Figure 2-1 Overview of the Model 250 projector showin g major components 2.2 Electrical Section The electri cal section consi sts of the Incoming Power C ircuit, and th e Power Supplies and the Ig niter Assembly. The following paragraphs give a list of major components and a brief des crip[...]

Chapter 2---System Description Model 250 Service Manual 2-3 Igniter A ssembly The Igniter Assembly provides the high voltage pulse that lights the Arc Lamp and acts as a link from the Arc Lamp Power Supply to the Arc Lamp after the Arc Lamp has bee n lit. ! Igniter - The Igniter actually performs three functions. It is a step-up transformer that su[...]

Chapter 2---System Description 2-4 Model 250 Service Manual ! Condensing Lenses (2) - The Primar y Condensing L ens collects all the light from the Light Pipe and begins to bend the light rays into a straig ht path. The Secondar y Condensing Le ns works with the Primar y Condensing Lens to collimate or “straighten” the light path before it ente[...]

Chapter 2---System Description Model 250 Service Manual 2-5 Relay Lens A ssemblies (3) There are thr ee Rela y Lenses, one for each color. The Rel a y Lens focuses the image light from the CRT onto the photosensitive layer on the input side of the ILA ® . The Relay Lens is physically connect ed to the CRT ( see Figure 2-2 ). Front Projection Lens [...]

Chapter 2---System Description 2-6 Model 250 Service Manual Printed Circuit Boards (PCB) The Model 250 Projector has eight main PCBs: ! System Controller PCB - System Controller PCB controls much of the electronics s ystem. I t uses di gital and analog circuitr y to generate Menu and internal pattern overla ys, and directs convergence cor rection a[...]

Chapter 2---System Description Model 250 Service Manual 2-7 provides an interconnection interfac e for all the electroni c components in the projector. CRT/Y oke Assemblies The CRT/Yoke Assemblies bridge between the Optical and the El ectronic sections. The CRTs could be included in the Optical section because the y produces the image lig ht transm[...]

Chapter 2---System Description 2-8 Model 250 Service Manual projector. These air-borne p articles can land on optics such as the ILA ® and cause large diffuse dark areas on the scr een. EMI Shield The Model 250 has an EM I (Electro-Magnetic Interference) Shield that traps and collects high frequenc y noise that is radiated by switching power suppl[...]

Chapter 2---System Description Model 250 Service Manual 2-9[...]

Chapter 3---Electr ical Model 250 Service Manual 3-1 3.0 Electrical Contents 3.1 Safet y............................................................................................................ 3-1 3.2 Incoming Power Circuit ............................................................................... 3-2 AC Power Cord ........................[...]

Chapter 3---Electr ical 3-2 Model 250 Service Manual Left/ Right Orientati on: W hen ref er r ing t o th e l ef t or r ig h t i n t hi s c h apt e r , i t i s wi th reference to standing at the rear of the projector, f acing the screen. Connectors on subassemblies and PCBs hav e tabs that must be released first before pulling on the connector. The [...]

Chapter 3---Electr ical Model 250 Service Manual 3-3 3.3 Power Supplies All Series 200 projectors including the Model 250 have three power supplies. These include: ! Low Voltage Power Supply ! Arc Lamp Power Supply ! High Voltage Power Supply There is a fourth power suppl y, the Laser Power Suppl y, but that power supply is used only for the Ignite[...]

Chapter 3---Electr ical 3-4 Model 250 Service Manual Figure 3-1 Low Voltage Power Supply I/O Diagram. LVPS - Operation: AC power is delivered to the Low Voltage Power Supply from the AC line filter. The AC is rectified to a DC Voltage, filtered, and goes throug h a power factor correction circuit to force the current waveform to follow the voltage [...]

Chapter 3---Electr ical Model 250 Service Manual 3-5 ! +5.1V for digital components ! +6.2V for CRT filaments ! ±15V for analog circuits ! +80V supply used b y the High Voltage Power Suppl y, Video Amplifier PCB, and the Horizontal/Vertical Deflection PCB. LVPS - Servi ce Adjustmen ts There are no s ervice adjustments for the Low Volta ge Power Su[...]

Chapter 3---Electr ical 3-6 Model 250 Service Manual ALPS - Inputs : AC input power: Directly from the AC Line Filter. The input ran ge is from 220- 240 VAC, at 50/60 Hz. /LAMP_ENA - from the S ystem Controller PCB. Turns on the ALPS. /COVER_ON - signal enabling the Arc Lamp Power Suppl y. /LAMP_OK - the input is jumpered at the Arc Lamp Power Supp[...]

Chapter 3---Electr ical Model 250 Service Manual 3-7 Figure 3-2 Arc Lamp Power Supply signals and voltages. ALPS - Operation: Three signals (/LAMP_ENA, /COVER_ON, and /LAMP_OK) are required in order for the Arc Lamp Power Supply to light the Arc Lamp. The /LAMP_OK (active low) input is jumpered to ground at the Arc Lamp Power Supply, so it is alway[...]

Chapter 3---Electr ical 3-8 Model 250 Service Manual The Arc Lamp Power Suppl y sends the /LAMP_LIT signal bac k to the System Controller when the Arc Lamp is lit. The Arc Lamp regulates its output to give a const ant Arc Lamp power. If the Arc Lamp has not lit within 20 seconds (/LA MP_LIT still high), the System Controller PCB will try once more [...]

Chapter 3---Electr ical Model 250 Service Manual 3-9 2. Turn the AC Circuit Breaker to the OFF position and unplug the AC Power Cord. 3. Remove the front cover ( see se ction 6.1 Projector Covers ). 4. Remove the lower-right-side pan el by removing the five Pozi-drive screws securing it. 5. Remove the five Pozi-drive screws secu ring the EMI Shield[...]

Chapter 3---Electr ical 3-10 Model 250 Service Manual Figure 3-4 High Voltage Power Supply I/O signals. HVPS - Inputs HVPS_SYNC - this signal is g enerated on the Raster Timing Generator PCB. Square wave HCT level with 50 or 33% dut y cycle. The signal is synchronized to horizontal sync. /HV_ENA - The HVPS shutdown signal from the Video Amplifier P[...]

Chapter 3---Electr ical Model 250 Service Manual 3-11 RGB Anode Voltage - goes directl y to each CRT RGB Focus Vol tage - goes di rectl y to each CRT Arc Ground - The Arc Gr ound protection for each CRT from the Video Amplifier PCB. HVPS - Operation The High Voltage Power Supply has three basic functions. ! High Voltage Generation ! Focus Voltages [...]

Chapter 3---Electr ical 3-12 Model 250 Service Manual HVPS - Remove and Replace Tools Needed #1 Pozi-drive Phillips-head screwdriver #2 Pozi-drive Phillips-head screwdriver small Flat head screwdri ver Parts Needed High Voltage Power Supply p/n 102566 To remove the High Voltage Power Suppl y: 1. Power off the projector by IR Remote or PC, and allow[...]

Chapter 3---Electr ical Model 250 Service Manual 3-13 Table 3-1 HVPS - P45 I/O Pinout PIN # Description PIN # Description 1 GND (+ 80V) 9 +15V 2 GND (+ 15V) 10 -15V 3 GND (- 15V) 11 G1 SUPPLY 4 GND (G1) 12 /HV_ENA 5 /HV_OK 13 V PARABOLA 6 H PARABOLA 14 H DRIVE (HVPS_SYNC 7 GND (DAF) 8 +80V Figure 3-6 High Voltage Power Supply. 5. Carefull y slide t[...]

Chapter 3---Electr ical 3-14 Model 250 Service Manual 10. Disconnect P45 (“Control”) at upper l eft of HVPS. 11. Disconnect and label the three Fo cus cables. The square tabs on thes e cables ( see Figure 3-6 ) ma y have to be lifted up. Gentl y pry up with a small Flat head screwdri ver. 12. Remove all the c ables from the slot in the cable gu[...]

Chapter 3---Electr ical Model 250 Service Manual 3-15 3.4 Igniter A sse mbly The Igniter Assembly consists of the Igniter and the Laser Power Supply. The Igniter and Laser Power Supply are replaced as one unit. Igniter Assemby - Main Functions: ! Generates 32 kV pulse to light Arc Lamp Power ! Acts as link between Arc Lamp Power Suppl y and Arc Lam[...]

Chapter 3---Electr ical 3-16 Model 250 Service Manual Figure 3-7 Ig niter Assembl y. Igniter Assembly - S ervice Adju stments There are no s ervice adjust ments performed on t he Igniter Assem bl y. Igniter Assembly - Remove and Replace Replace the Igniter and the Laser Po wer Suppl y as one unit. Tools Needed 2 - 7/16-inch wrench (one open end wre[...]

Chapter 3---Electr ical Model 250 Service Manual 3-17 5. Disconnect the orange cable attached to the input side of the Igniter Transformer using the 7/16-inch wrench. This ca ble will have black shrink sleeving on it. It goes to the negative terminal of the Arc Lamp Power Supply. 6. Disconnect the orange Cathode cable from the Igniter ground post u[...]

Chapter 4---Optical Model 250 Service Manual 4-1 4.0 Optical Contents 4.1 Arc Lamp...................................................................................................... 4-2 4.2 Optical Path .................................................................................................. 4-7 4.3 ILA ® ..............................[...]

Chapter 4---Optical 4-2 Model 250 Service Manual 4.1 Arc Lamp The Arc Lamp is the beg inning of the high intensity Light Path. It is loc ated inside a housing on the right side of the Optical Support Assembl y ( see Figure 4-5 ). Arc Lamp - Main Functions: The Arc Lamp is a single component composed of a X enon gas bulb at the center of a compound [...]

Chapter 4---Optical Model 250 Service Manual 4-3 CA U T IO N ! Fan di sconnection is acceptable for a shor t period of time only (pr eferably <20 minut es--max imum 45 minutes). W A RNIN G !!! Dang erous level s of ultrav iolet and infrared r adiatio n, dangerous glar e, very high temperat ures (18 0°C to 300°C) and high inter nal gas pr essur[...]

Chapter 4---Optical 4-4 Model 250 Service Manual Hot spot off-center Figure 4-1 Arc Lamp “Hot Spot” (bri ghtest area) i s off-ce nter verti call y and horizontally. Adjust to center the “hot spot”. Figure 4-2 Arc Lamp alig nment fix ture.[...]

Chapter 4---Optical Model 250 Service Manual 4-5 Figure 4-3 Arc Lamp Assembl y access door. Arc Lamp - Remove and Replace The Arc Lamp Enclosure Assembl y consists of the Xenon Arc Lamp module and blower. Replace the blower together with the Arc Lamp Module. Tools Needed 7/16 inch wrench #1 Pozi-drive Phillips-head screwdriver Diagonal wire cutters[...]

Chapter 4---Optical 4-6 Model 250 Service Manual 5. Disconnect the orange Cathode cable from the Igniter, using the 7/16-inch wrench ( see Figure 3-7 ). 6. Cut the cable tie that is wrapped around the fer rite inductor (metal tube with white cap below the blower). 7. Disconnect the Arc Lamp door fan cable. This cable runs through the door and out t[...]

Chapter 4---Optical Model 250 Service Manual 4-7 Figure 4-4 Arc Lamp Assembly top view. 4.2 Optical Path Optical Path - Main Function ! Transports the Arc Lamp high inte nsity light from the Arc Lamp to the ILA ® and from the ILA ® to the Projection Lens ! Removes the Infrared light that contains most of the heat ! Removes the unwan ted Ultraviol[...]

Chapter 4---Optical 4-8 Model 250 Service Manual Figure 4-5 Upper level view of Optical Path (top view). Optical P ath - Inputs Arc Lamp high intensity white light Component RGB Image light from each of the ILA ® Optical Path - Outputs Component RGB polarized light to the ILA ® Output image ligh t to the Projection Lens Optical Path - Operation T[...]

Chapter 4---Optical Model 250 Service Manual 4-9 The Dichroic Beamsplitter Asse mbly separates the white light into its re d, green, and blue components. Each component light beam goes into the Prism Assembl y where it is polari zed. Light can be viewed as having two electromagnetic components: a Horiz ontal- electric field and a V ertical -electri[...]

Chapter 4---Optical 4-10 Model 250 Service Manual Figure 4-6 Optical Path[...]

Chapter 4---Optical Model 250 Service Manual 4-11 Figure 4-7 Optical Path Optical Path - Servi ce Adjustmen ts Tools Needed 3-mm Hex wrench Parts Needed No serviceable parts The one adjustment that can be performed on th e optical path is with the XY Positioner that moves the #1 Condensing Lens in the X- and Y-axis. The XY[...]

Chapter 4---Optical 4-12 Model 250 Service Manual Positioner adjusts the light beam coming out of the Light Pipe so that it projects squarel y onto the face of the ILA ® . NOTE: Do not adjust the XY Positioner unless there is a dark edge visible on screen. If the XY Positioner is misalig ned, there will be a dark edge on the left, right, top or bo[...]

Chapter 4---Optical Model 250 Service Manual 4-13 4.3 ILA ® ILA ® Main functions ! Modulates image light from the CRT onto the high intensity polarized light from the Arc Lamp ! Reflects hig h intensity light received from the Prism Assembly back into the Prism Assembly after modulating with image light ! Adjustable bias voltage and frequenc y (I[...]

Chapter 4---Optical 4-14 Model 250 Service Manual ILA ® Operation The ILA ® plays a critical part in bringing the image to the screen. The ILA ® receives the i mage light when th e CRT proje cts the image throu gh the Rela y Lens and focuses it onto the photoconductive la yer on the input side of the ILA ® . The image does not pass directly thr[...]

Chapter 4---Optical Model 250 Service Manual 4-15 NOTE: Reset the IL A ® bias after setting the Compe nsator and check G 2 Sensitivity Offset, and Threshold Offset level ( see Model 250 User’s Guide, section 5.8 Black Level G 2 and Sensitivity Offset ). ILA ® Overlap This adjustment positions the I LA ® assemblies in the ir sockets so that the[...]

Chapter 4---Optical 4-16 Model 250 Service Manual CA U T IO N! To av oid damagi ng the con nector, grasp the I LA ® assembly itself, not the connector at the top . Figure 4-10 ILA ® Assembl y top view. The overlap screws shown are under the ILA ® . The y are visible only after the ILA ® asse mbly is removed. 13. If the overlap is at the top or [...]

Chapter 4---Optical Model 250 Service Manual 4-17 19. Retighten the two wing nuts and tighten the two hex nuts. 20. Reset the ILA ® biases to their previous levels from Step 2. ILA ® Back Focus Adjustment The ILA ® Back Focus adj ustment moves the ILA ® /Re la y Lens/CRT assemblies forward or backward as one unit to focus the ILA ® output on t[...]

Chapter 4---Optical 4-18 Model 250 Service Manual W A RNIN G !!! Always wear an ANSI/AS TM 10,000 volt rated safety glov e when wor king around CR Ts due to th e High Voltage pr esent th ere. NOTE: If t h e I LA ® /Relay Lens/CRT assembly cannot be moved close enough to get a good spacer ball focus, loosen the CRT Lens Stopper Ring in front of the[...]

Chapter 4---Optical Model 250 Service Manual 4-19 8. Loosen the two hex bolts ( see Figure 4-10 ) on the ILA ® assembly in front of the Relay Lens. 9. Slide the Relay ILA ® /Lens/CRT assembly forward or back ward to achiev e the sharpest spacer b all focus. NOTE: Do not use the projection lens focus while performin g this step. 10. Tighten the he[...]

Chapter 4---Optical 4-20 Model 250 Service Manual 4.4 Relay Lenses The Rela y Lens focuses the image light r eceived from th e CRT on the photoconductive layer of the ILA ® ( see Figure 4-9 ). Ther e are no service adjustments for the Relay Lens. The Rela y Le ns rar el y needs service and is not considered a servic eable part . 4.5 Projection Len[...]

Chapter 4---Optical Model 250 Service Manual 4-21 3. Loosen (do not remove) the Lens holding screw at the ri ght side ( see Figure 4-11 ) of the Projection Lens. Figure 4-11 Projection L ens holding screw and removal notch. NOTE: The 0.96:1 Projection Lens has an adapter sleeve installed on it. The Projection Lens is installed the same as other Pro[...]

Chapter 5 Optical 3-4-22 Model 100 Service Manual[...]

Chapter 5---Electronics Model 250 Service Manual 5-1 5.0 Electronics Contents 5.1 Safet y............................................................................................................ 5-1 5.2 Introduction .................................................................................................. 5-2 5.3 System Controller PCB ..[...]

Chapter 5---Electronics 5-2 Model 250 Service Manual W A RNING !! ! Nev er look directly at the Arc La mp, the lighted Projectio n Lens or into th e lamp housi ng, fr om any dista nce, when the projector is on. Di rect ex posure to lig ht of this brightness can cause severe ey e injury . 5.2 Introducti on The Model 250 Electronics S ystem includes [...]

Chapter 5---Electronics Model 250 Service Manual 5-3 Figure 5-2 Model 250 Electronics Module with PCBs (side view). CA UT IO N ! It is ver y stro ngl y reco mm en ded tha t set up data be dow nloaded ( Expor ted, see s ection 8.2 Im porting/Exportin g ) before performi ng any o f the follow ing pr ocedures. Ex porting baseli ne source setup data to[...]

Chapter 5---Electronics 5-4 Model 250 Service Manual ! I/O control for VIC selection ! Two RS-232 serial interface ports ! Infrared ( IR) remote control interface. Acc epts input from front or rear IR detectors. ! External 3 color system sta tus LEDs. Green indicates normal, yellow is standby and red indicates a fault condition. ! External Service [...]

Chapter 5---Electronics Model 250 Service Manual 5-5 Figure 5-4 System Controller PCB I /O Di agram for Power Supplies and peripher als.[...]

Chapter 5---Electronics 5-6 Model 250 Service Manual Figure 5-5 System Controller PCB I/O Dia gram for other PCBs. System Controller PCB - Inputs /LV_OK - signal from the Low Voltage Power Suppl y; it tells the Sy stem Controller PCB that all the non-standby supply voltages are working. /HV_OK - signal from the High Voltage Power Suppl y; it tells [...]

Chapter 5---Electronics Model 250 Service Manual 5-7 280_CLK - Square wave signal from the Raster Timing Generator PCB, with 50% duty cycle, s y nchronized to the horizontal s ync at 280 times the frequency of the horizontal sync. This signal is used by the System Controller PCB to properly output shading and convergence data. SOURCE_VALID - Sig na[...]

Chapter 5---Electronics 5-8 Model 250 Service Manual RGB_THRES - red, green, or blue Threshold corr ection information to the Video Processor PCB. RGB_SENS - red, green, or blue Sensitivity correction information to the Video Processor PCB. ISYNC - 5 MHz clock to the Raste r Timing Generator PCB, used to gene rate the internal sync sig nals Y_RGB_C[...]

Chapter 5---Electronics Model 250 Service Manual 5-9 Figure 5-6 Power On timing seque nce. Normal Operation Functions During normal projector operation, the S ystem Controller PCB receives commands through the remote control, tethered remote control, or a PC. Commands issued from the I R remote controls are receive d through IR Detectors located on[...]

Chapter 5---Electronics 5-10 Model 250 Service Manual Controller PCB also enables the selected VICs through the IIC bus based on the VIC selected on the Channel Menu. The System Controller PCB generates the on-screen menus and test pattern overlays and sends them to the Video Processor PCB. It sends the X and Y Convergence correction dat a to the C[...]

Chapter 5---Electronics Model 250 Service Manual 5-11 5.4 Video Processor PCB Video Processor PCB - Main Fun ctions ! Video signal input and multiplexing ! Sync signal stripping ! Overlay signal multiple xing ! Brightness, Contrast, DC Restore and Blanking ! Video signal gamma correction ! Sensitivity and Threshold signal input and control ! Automa[...]

Chapter 5---Electronics 5-12 Model 250 Service Manual Figure 5-7 Video Processor PCB I/O diagram for VICs and Power Supplies.[...]

Chapter 5---Electronics Model 250 Service Manual 5-13 Figure 5-8 Video Processor PCB I/O diagram for PCBs. Video P rocessor PCB - Output s RGB_VID - red, green, or blue video si gnal to Video Amplifier PCB, typicall y 0- 1 V. H&V_SYNC - horizontal sync pulse goes to the Ra ster Timing Generator PCB. GRN_SYNC - sync-on-gree n s ync pulse goe s t[...]

Chapter 5---Electronics 5-14 Model 250 Service Manual RGB_G 2 - red, green, or blue G 2 voltage adjust control signal to the Video Amplifier PCB. G 1 _BIAS - G 1 a djust control voltage (g lobal adjustment) to the Video Amplifier PCB. IIC_INT - IIC interrupt output to System Controller PCB. Video Processor PCB - Operation The Video Processor PCB a [...]

Chapter 5---Electronics Model 250 Service Manual 5-15 The G 2 voltage accelerate s the electrons that are emitted from the c athode of the CRT. The CRT filament emits the electrons and G 1 voltage regulates the amount of electrons that are emitted from the cathode. The G 2 voltage is adjusted throug h the menu (Bl ack Level). The Video Processo r P[...]

Chapter 5---Electronics 5-16 Model 250 Service Manual 6. Pull the black card extractor h andles back to disconnect the Video Processor PCB connector and pull the PCB out of the Electronics Module. 7. Reverse the p rocedure to in stall the Vi deo Processor P CB. 5.5 Raster Tim ing Generator PCB Raster Timing Generator PCB - Main Functions ! Generate[...]

Chapter 5---Electronics Model 250 Service Manual 5-17 Figure 5-11 Raster Timing Generator for other PCBs. Raster Timing Gener ator PCB - Inputs V_SYNC - input vertical s ync from the Video Processor PCB. H_SYNC - input horizontal sync from the Video Processor PCB. G_SYNC - Sync-on-Green s ync stripped from green video sign al at the Video Processor[...]

Chapter 5---Electronics 5-18 Model 250 Service Manual IIC_CLK - IIC clock line. Unidirectional clock line for control of s ynchronous data transfer over the IIC bus. IIC_DATA - IIC data line. Bi-dir ectional serial line for s ynchronous data transfer between System Controlle r PCB and Raster Timing Generator PCB. +15 V (two inputs) - input power fr[...]

Chapter 5---Electronics Model 250 Service Manual 5-19 V_DRIVE - square wave negative going pulse to the Convergence Defle ction PCB, synchronized to the selected vertical s ync with the pulse width of about four horizontal periods. Raster Timin g Generato r PCB - Opera tion The Raster Timing Generator PCB generate s a square wave that is phase-lock[...]

Chapter 5---Electronics 5-20 Model 250 Service Manual Vertical Deflection PCB to break the range of horiz ontal scan frequencies into four smaller ranges called bands ( see Figure 5-12 ). Figure 5-12 L EDs on the Raster Timing Generator PCB . Raster Timing Generator PCB - Remove and Replace Tools Needed #1 Pozi-drive Phillips-head screwdriver Parts[...]

Chapter 5---Electronics Model 250 Service Manual 5-21 5.6 Horizontal Ve rtical Deflection PCB Horizontal Verti cal Def lection PCB - Main Fun ctions ! Drive the main horizontal deflection coils to provide horizontal raster sc an for the CRTs ! Drive main vertical coils to provide vertical raster scan for the CRTs ! Horizontal rast er centering for [...]

Chapter 5---Electronics 5-22 Model 250 Service Manual IIC_CLK - IIC clock line IIC_DATA - IIC data line IIC_SINT - IIC interrupt ±15 V - input power from the Low Voltage Power Supply, for the analog circuitry. +5.1 V - input power from the Low Volta ge Power Supply, for the digital circuitry. Figure 5-13 Horizonta l/Vertical I / O Diagram.[...]

Chapter 5---Electronics Model 250 Service Manual 5-23 Figure 5-14 Horizontal/Verti cal I/O Dia gram for Scan R eversal and Vi deo Amplifier PCBs.[...]

Chapter 5---Electronics 5-24 Model 250 Service Manual Figure 5-15 Phy si cal layout of the Horiz ontal/Vert ical PC B (note the Vertical Siz e Adjustment Pots (Red-137, Grn-148, and Blu-160) on the lower ri ght). Horizontal Verti cal Def lection PCB - Outpu ts /SWEEP_OK - signal to the Video Amplifier PCB, derived from the H_ENA signal from the Ras[...]

Chapter 5---Electronics Model 250 Service Manual 5-25 Horizontal Verti cal Def lection PCB - Operation The Horizontal Vertical Deflection PCB consists of a RGB horizontal deflection amplifier and separate vertical deflection amplifiers. The Horizontal Deflection Amplifier The horizontal deflection amplifier is a switching mode power suppl y that va[...]

Chapter 5---Electronics 5-26 Model 250 Service Manual the V_PARAB waveform. The output waveform V_RG B+ goes to the Scan Reversal PCB and then drives the Vertical Deflection Yokes. The V ertical Deflection Yoke return signal to the Horiz ontal Vertical Deflection PCB is V_RGB-. Horizontal Verti cal Def lection PCB - Servic e Adjust ments Vertical S[...]

Chapter 5---Electronics Model 250 Service Manual 5-27 Figure 5-17 Red image needs verti cal adjustm ent (increas e). If Red is higher than Green at the top and bottom, or lower than Green at the top and bottom, the Red image may not being centered corr ectl y. This can be correct ed with the c entering adj ustment ( see Model 250 User’s Guide, Ch[...]

Chapter 5---Electronics 5-28 Model 250 Service Manual Horizontal Vertical Deflection PCB - Remove and Replace The Horizontal/Vertical (H/V) De flection PCB is located in the upper portion of the Electronic Module card ca ge. Tools Needed: #1 Pozi-drive Phillips-head screwdriver Parts Needed: Horizontal Vertical Deflection PCB p/n 105236 To remove t[...]

Chapter 5---Electronics Model 250 Service Manual 5-29 ! Convergence output amplifiers for all colors and both horizontal and vertical ax es ! Convergence enable and raster fill function ! ILA ® assembly driver circuitry with tempera ture compensation ! Phase locked loop for ILA ® assembl y drivers ! IIC serial bus interface Conver gence D eflecti[...]

Chapter 5---Electronics 5-30 Model 250 Service Manual Figure 5-19 Convergence Deflection PCB I/O Diagram.[...]

Chapter 5---Electronics Model 250 Service Manual 5-31 Figure 5-20 Convergence Deflection PCB I/O Diagram.[...]

Chapter 5---Electronics 5-32 Model 250 Service Manual Figure 5-21 Phy si cal layout of the Convergence/Deflection PCB. Convergence Deflecti on PCB - O peration The Convergence Deflection PCB performs fou r main functions. It generates the vertical deflection sawtooth waveform. It generates the square w aves that bias the three ILA ® s. It controls[...]

Chapter 5---Electronics Model 250 Service Manual 5-33 temperatur e of the green I LA ® increases, the bia s is increased to mainta in a constant ILA ® output. The Convergence Defle ction PCB receives commands for x and y-axis convergence from the S ystem Controller PCB. The Convergence Defl ection PCB has a Convergence Control Section that receiv[...]

Chapter 5---Electronics 5-34 Model 250 Service Manual 8. Reinstall the Convergence/Deflection PCB by lowering the right side in first until it clears the electronic module ed ge, then lowering the left side in. NOTE: It may be necessary to fit the top 2 fins of the heat s ync over the electronic module frame lip at the left to get enou gh clearance[...]

Chapter 5---Electronics Model 250 Service Manual 5-35 Y_RGB_YOKE (neg.) - bottom of red, green, and blue y-axis convergence yokes. RGB_LOCK (neg.) - interlock for red, green, and blue deflection yokes (5 V when closed or 0 V when op en). Scan Reversal PCB - Outputs H_LOCK (neg.) - Horizontal Interlock for the yoke connectors to the Horiz ontal Vert[...]

Chapter 5---Electronics 5-36 Model 250 Service Manual Figure 5-22 Scan Reversal PCB I/O Diagram .[...]

Chapter 5---Electronics Model 250 Service Manual 5-37 Figure 5-23 Scan Reversal PCB I/O Dia gram for Horizontal Vertical Deflection PCB .[...]

Chapter 5---Electronics 5-38 Model 250 Service Manual Figure 5-24 Scan Reversal PCB I/O Dia gram for CRT Yokes. Scan Reversal PCB - Operation The Scan Reversal PCB has several functions. It provides an interface for scan reversal, and provides for horizontal width adjustment. The Scan Reversal PCB outputs the convergence and defle ction waveforms t[...]

Chapter 5---Electronics Model 250 Service Manual 5-39 front/upright projection. This means the horizontal scan jumper is plugged into J100, the vertical scan jumper is plugged into J 53, and the convergence jumper is plugged into J50. NOTE: Whenever the horizontal scan jumper is switched from front projection to rear projection, the conver gence mu[...]

Chapter 5---Electronics 5-40 Model 250 Service Manual Scan Reversal PCB - Service Ad justmen ts Figure 5-25 Phy s ical layout of the Scan Revers al PCB. Horizontal Size adjustment The Horizontal size adjustment must be performed after the Ho rizontal Vertical Deflection PC B is repl aced. Tools Needed Delrin .100 hex alignment tool Equipment Needed[...]

Chapter 5---Electronics Model 250 Service Manual 5-41 10. Recheck all Geometr y and Convergence settings and readjust wherever necessar y. 11. Replace the rear cover. Front/Rea r Projection Jumper Setting s In the procedures below ea ch of the jumpers mentioned have a speci fic purpose: J100 and J101 are the horizontal scanning jumpers, J 53 and J5[...]

Chapter 5---Electronics 5-42 Model 250 Service Manual Table 5-1 Projection orie ntation jumper setting s. Orientatio n Conver gence. P50 goes to: Vertical. P53 goes to: Horiz ontal. P100 goes t o: Front/Floor (Upright) J50 J 53 J100 Front/Inverted* JA50 JA53 J101 Rear/Floor (Upright) JA50 J 53 J 101 Rear/Inverted* J 50 J A53 J100 * see CA UTION ! b[...]

Chapter 5---Electronics Model 250 Service Manual 5-43 7. Power ON the projector and allow it to stabilize for a minimum of 15 minutes. It is recommended that the projector be op erating for a least one hour before performing shading adjustments. 8. When changing jumpers for floor or ceiling screen projection, Centering, Convergence and Shading must[...]

Chapter 5---Electronics 5-44 Model 250 Service Manual Video Am plifier P CB - Inputs RGB_VIDEO - image pre-amp signals from the Video Pro cessor PCB (about 0.5 Vpp). RESTORE - image DC restorations pulse from Video Processor PCB, logic level positive going 4% dut y c ycle. BLANKING - Blanking signal, logic F type. G 1 _SUPPL Y - suppl y for G 1 gri[...]

Chapter 5---Electronics Model 250 Service Manual 5-45 Figure 5-26 Video Amplifier PCB I/O Diagram[...]

Chapter 5---Electronics 5-46 Model 250 Service Manual Figure 5-27 Video Amplifier PCB I /O Diagram for th e Video Processor PCB and CRTs. Video Amplifier PCB - Outputs RGB_BEAM - Cathode beam current sens e lines (about 1 V per 100 µ A). RGB_CATHODE - image output signal to CRTs (about 40 Vpp with peak voltage of 70 V). RGB_G 1 - G 1 voltag e to C[...]

Chapter 5---Electronics Model 250 Service Manual 5-47 RGB_HEAT (neg.) - negative side of CRT heater volta ge (ground level). ARC_GND - CRT ground back to High Voltage Power Suppl y (CRT Protection against arcin g). /VA_OK - CRT Protection signal to the High Voltage Power Supply (low = good, high = bad). This signal is becomes /HV_ENA at the High Vo[...]

Chapter 5---Electronics 5-48 Model 250 Service Manual The Video Amplifier PCB detects all the necessar y supply voltages (+80 V, +15 V, and the +6.2 V) for the CRT and includes that as part of the /VA_O K signal. If any of the supply voltages is not present, /VA_OK goes high, again shutting down the G1 and G2 regulators. The /VA_OK goes out to the [...]

Chapter 5---Electronics Model 250 Service Manual 5-49 5. Remove the green CRT by loosening the green CRT Holder Ring ( see Figure 5-29 ). Perform this step with the CRT Socke t Connector still connected to the Green CRT and the ground wire still connected from the CRT/Yoke Assembly to the CRT Socket Connector. The Green CRT Socket Connect or is clo[...]

Chapter 5---Electronics 5-50 Model 250 Service Manual 12. Disconnect the thr ee Focus c ables that run f rom the CRT S ocket Connectors to the Focus connectors on the HVPS. NOTE: Observe that each o f the thre e Focus c ables (large, r ed wires that run from each CRT Socket Connector to the Focus conn ectors on the HVPS) is joined near the CRT by a[...]

Chapter 5---Electronics Model 250 Service Manual 5-51 5.10 CRT/Yoke A ssemblies CRT/Yoke Assemblie s - Main Function ! CRTs converts image signal to image light ! Yokes provide horizontal and vertical defl ection for CRTs ! Yokes provide x-axis and y-axis convergence correction for CRTs CRT/Yoke A ssemblies - Input s To Yokes H_RGB_YOKE (pos.) - to[...]

Chapter 5---Electronics 5-52 Model 250 Service Manual Image - image lig ht that passes throu gh Relay Lens and focuses on photosensitive layer on input side of ILA ® . CRT/Yoke Assemblies - Ope ration The CRTs receiv e image signals t hat come from t he VICs to the Vi deo Processor PCB, to the Video Amplifier PCB. The image information drives an e[...]

Chapter 5---Electronics Model 250 Service Manual 5-53 CRT Mechanical Focus The CRT Mechanica l focus is factory-set and normally will not require additional adjustment unless a CRT has been replaced. After repla cing a CRT, reset the mechanical focus. Aft er completi ng the CRT i nstallation and m echanical focus, check the oth er CRTs for conver g[...]

Chapter 5---Electronics 5-54 Model 250 Service Manual Figure 5-29 CRT Mechanical Focus adj ustments. CRT Rotation The CRT tilt adjustment a ligns the CRT level with the screen. This is a fac tor y-set adjustment and should not need adjusting unless the CRT or yoke is moved. Tools Needed 1.5-mm Hex-head wrench #0 Pozi-drive Phillips-head screwdriver[...]

Chapter 5---Electronics Model 250 Service Manual 5-55 5. View the color for the CRT that requires rotation. Hide the othe r two colors. 6. In the Geometry menu, set “Reg Enable” to of f b y unchecking the box. Unchecking the Reg Enable box temporaril y disables any convergenc e corrections that have been performed with a different CRT/Yoke asse[...]

Chapter 5---Electronics 5-56 Model 250 Service Manual CRT Electroni c Focus The Electronic Focus is fac tor y-set a nd normall y will not ne ed to be adjusted except after component replacement, maintenance, o r if wide temperature variations exist between the factor y and the field location. View one color at a time. Tools Needed Medium Phillips-h[...]

Chapter 5---Electronics Model 250 Service Manual 5-57 CRT/Yoke Assemblies - Remove and Replace Three CRT/Yoke Assemblies ar e located in the CRT Assembly a rea below the card cage ( see Figure 5-30 ). W A RNIN G !!! Handle the C RT/Yoke Asse mblies w ith extreme ca ution. I f they ar e dropped , they can im plode a nd flying glass can cause s evere[...]

Chapter 5---Electronics 5-58 Model 250 Service Manual NOTE: For the Green CRT/Yoke Assembly only, it is best to perform Step 10 with the CRT socket connector still connected to the Green CRT and the ground wire still connected from the CRT to the socket connector. Because the Green CRT socket connector is close to the r ear of the projector, it is [...]

Chapter 5---Electronics Model 250 Service Manual 5-59 ! YPbPr (Optional) ! Quad Standard Decoder (Optional) ! Quad Standard Decoder/Line Double r (Optional) The are three V ICs slots on the Model 250, however the 4-I np ut RGBHV, and the Quad Standard Decoder/Line Doubler requir e two slots. Standard RGBHV VIC RGBHV VIC - Main Functions ! Interface[...]

Chapter 5---Electronics 5-60 Model 250 Service Manual RGBHV VIC - Inputs R - red image from source input (0.7-1.0 Vpp). G - green image from source input (0.7-1.0 Vpp). B - blue image from source input (0.7-1.0 Vpp). H - horizontal sync from source input V - vertical sync from source input +15 V - (not used) -15 V - (not used) +5.1 V - power for di[...]

Chapter 5---Electronics Model 250 Service Manual 5-61 Parts Needed RGBHV VIC p/n 102597 To remove the RGBHV VIC: 1. Power off the projector by IR Remote or PC, and allow the coolin g fans to run until they shut off. 2. Turn the AC Circuit Breaker to the OFF position and unplug the AC Power Cord. 3. It is not necessary to remove the rear cover. 4. D[...]

Chapter 5---Electronics 5-62 Model 250 Service Manual Figure 5-34 Graphics Enhancer Plus faceplate. Graphics Enhancer P lus VIC - Inputs R - red image from source input (0.7-1.0 Vpp). G - green image from source input (0.7-1.0 Vpp). B - blue image from source input (0.7-1.0 Vpp). H - horizontal sync from source input V - vertical sync from source i[...]

Chapter 5---Electronics Model 250 Service Manual 5-63 Graphics E nhan cer Plus VIC - Ope ration The RGBHV VIC receives the sepa rate red, green, blue image inputs and horizontal, and vertical sync inputs from the source input device. The image signals go to a ima ge enhancement si gnal processor that peaks the black d etails, enhances white details[...]

Chapter 5---Electronics 5-64 Model 250 Service Manual 4-Input (Quad) RGBHV VIC 4-Input (Quad) RGBHV VIC - Main Func tions ! Interface for four s ets of Red, Green, and Blue image inputs ! Interface for four s ets of Horizontal and Vertical synchroniz ation pulses ! VIC selec tion b y II C Serial Data Bus ! LED indication of VIC selection Figure 5-3[...]

Chapter 5---Electronics Model 250 Service Manual 5-65 IIC CLK - IIC clo ck line IIC DATA - IIC data line IIC SINT - IIC interrupt line Figure 5-36 4-I nput (Quad) RGBH V VIC.[...]

Chapter 5---Electronics 5-66 Model 250 Service Manual 4-Input (Quad) RGBHV VIC - Outputs RED_VIC - red image to the Video Processor PCB (0.7-1.0 Vpp). GRN_VIC - green image to the Video Processor PCB (0.7-1.0 Vpp). BLU_VIC - blue image to the Video Processor PCB (0.7-1.0 Vpp). H_VIC - horizontal sync to the Video Processor PCB V_VIC - vertical s yn[...]

Chapter 5---Electronics Model 250 Service Manual 5-67 YPbPr VIC This decoder video input card (YPbPr_VIC) contains three BNC input connectors that can be used for two differ ent inputs, YPbPr or GBR. The YPbPr PCB converts these component signals to RGB t ype image signals. YPbPr VIC - Main Functions ! Image input and output buffers ! Conversion of[...]

Chapter 5---Electronics 5-68 Model 250 Service Manual Figure 5-38 YPbPr VIC faceplat e. YPbP r VIC - Inputs YPbPr I nputs Y - green image input with composite horizontal and vertical sync (0.7-1 Vpp ) Pb - blue image input for YPbPr (0.7-1 Vpp) Pr - red image input for YPbPr (0.7-1 Vpp) GBR I nputs Grn - green image input with composite horizontal [...]

Chapter 5---Electronics Model 250 Service Manual 5-69 interface. An operator selects the V IC and input in the Channels Menu (see section 4-6 in the User’s Guide) . The YPbPr V I C strips t he s ync pulses that are combi ned with the green image signal (Y in YPbPr mode) and sends them to the Video Processor PCB as a composite sync signal (H_SYNC)[...]

Chapter 5---Electronics 5-70 Model 250 Service Manual Quad Standard Decoder VIC The Quad Standard Decoder VIC provides an interface fo r composite and S-Video formats input. It contains three BNC input connectors, one for Composite Video and two for S-Video (luminance and chrominanc e). This decoder VIC converts Composite and S-image formats to RGB[...]

Chapter 5---Electronics Model 250 Service Manual 5-71 Quad Standard D ecoder VIC - Inputs Comp - input for Composite image sig nal includes s ync pulses (.07-1 Vpp) Yin - input for Luminance or brightness information of S-image (0.7-1 Vpp ) Cin - input for Chrominance or color information of S-image (0.3-0.6 Vpp) +15 V - power for analo g circuitr [...]

Chapter 5---Electronics 5-72 Model 250 Service Manual when the S-image input is selected. Only one LED will be illuminated at one time. Neither LEDs will be illuminated when the Quad Standard Decoder VIC is not selected as the input to projector. Quad S tandard Decod er VIC - Service Ad justmen ts There are no ph ysical service adj ustments to t he[...]

Chapter 5---Electronics Model 250 Service Manual 5-73 installed in the #2 or 3 VI C slot (it will not fit into the #1 slot), a blank face plate must be installed above it. The blank faceplate is not included with the Quad Standard Decoder/Line Doubl er VIC unless it is installed at the factor y. The part number for the blank faceplate is p/n 102667[...]

Chapter 5---Electronics 5-74 Model 250 Service Manual 5.12 Backplane PCB The Backplane PCB is the spine of the Electronics Module. Ever y major electronic component in the Model 250 projector connects to and throu gh the Backplane PCB. It is hidden in the inside of the Electronics Module ( see Figure 5-2 ). The System Controller PCB, Raste r Timing[...]

Chapter 5---Electronics Model 250 Service Manual 5-75 Figure 5-43 Backplane Diagram (middle section). The following is a list of pins that would be helpful for troubleshooting purposes. Low Vol tage Power Supply (J8) High Vol tage Pow er Supply (J7) Pin # Signal or Voltag e Pin # Signal or Voltag e 8 /LV_ENA 5 /HV_OK 9 /LV_OK 8 +80 V 10 +24 V_FAN S[...]

Chapter 5---Electronics 5-76 Model 250 Service Manual Figure 5-44 Backplane Diagram (right side).[...]

Chapter 5---Electronics Model 250 Service Manual 5-77[...]

Chapter 6---Miscellaneous Items Model 250 Service Manual 6-1 6.0 Miscellaneous Items Contents 6.1 Projector Covers ........................................................................................... 6-1 6.2 Electronics Module Tilt-up .......................................................................... 6-2 6.3 Ventilation .............[...]

Chapter 6---Miscellaneous Items 6-2 Model 250 Service Manual 5. When the Latch Levers are inserted into the holding slots, lift the cover off. Be careful not to brush against an y of the internal components of the projector when removin g the cover. If an y undue resistance is felt, stop to locate the source before p roceeding. 6. Replace the cover[...]

Chapter 6---Miscellaneous Items Model 250 Service Manual 6-3 Figure 6-1 Electronics Module hinge and locking mechanism. 6.3 Ventilation Adequate cooling is a major consideration for the Model 250 p rojector. There are thirteen cooling fans (including the Arc Lamp blower) in this projector. ! 4 fans in the main chassis - two in the rear of the proj [...]

Chapter 6---Miscellaneous Items 6-4 Model 250 Service Manual 6.4 A ir Filters There are three pol yurethane air filters in the Model 250. Air filters should be cleaned whenever nece ssar y. I n extremel y dusty or dirty conditions, the filte rs should be cleaned more frequentl y. Remove the filters and vacuum them or blow them clean wit h compresse[...]

Chapter 6---Miscellaneous Items Model 250 Service Manual 6-5 The EMI Shield is a me tal plate located in front of the Low Voltage Power Supply and the Arc Lamp Power Supply. It must be removed before removin g either of these po wer supplies. Be sure to repl ace th e EMI Shield aft er replac ing either the Low Voltage Power Suppl y or the Low Volta[...]

Chapter 6---Miscellaneous Items 6-6 Model 250 Service Manual[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-1 7.0 T roubleshooting Contents 7.1 Safet y............................................................................................................ 7-1 7.2 LEDs............................................................................................................. 7-2 Backpanel LEDs ..[...]

Chapter 7---Troubleshooting 7-2 Model 250 Service Manual Left/ Right Orientati on: W hen refe rring to the le ft or righ t in th is chap ter, it is with r eference to sta nding at th e rear o f the proj ector, facing the screen . Connectors on subassemblies and PCBs hav e tabs that must be released first before pulling on the connector. The proper [...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-3 Figure 7-1 Rear Panel layout Control Out - The Control Out terminal is another RS232 port similar to the Terminal In port except that it can not be used to Import/Export setup data. Tethered Remote Jack - T he Model 250 projector is shipped with an IR Remote Control. This IR Remote can be use[...]

Chapter 7---Troubleshooting 7-4 Model 250 Service Manual Figure 7-2 Dip Switch Block on System Controller PCB. Reset Switch - The Reset Switch resets the CPU if the projector locks up and does not respond to an IR Remote, PC or Laptop computer. If the rear panel is in place, the CPU can also be reset b y cycling the AC Circuit Breaker off and back [...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-5 Video Processor PCB LEDs Figure 7-4 Video Processor Test Points and LEDs . Video Processor - Test Points The test points on the Video Processor PCB are visible and accessible from the left side of the Electronics Module when the re ar projector cover is removed. The test points can be grouped[...]

Chapter 7---Troubleshooting 7-6 Model 250 Service Manual Sync - There ar e three s ync test points: H sync for the horizontal s ync pulse, V sync for the vertical s ync pulse, and G s ync, which is a combination of the horizontal and vertical s ync pulses that are carried with the green image signal. External - There are thr ee ext ernal image test[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-7 Raster Timing Gener ator PCB LEDs Figure 7-6 Raster Timing Generator LEDs.[...]

Chapter 7---Troubleshooting 7-8 Model 250 Service Manual Raster Timing Generato r PCB LEDs Band LEDs The range horizontal scan fr equencies accepted b y the Model 250 projector is divided into four “bands”. The four LEDs (A, B, C, & D) toward the front of the projector on the Raster Timing Generator PCB indic ate which range of horizontal s[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-9 Convergence Deflection PCB LED Figure 7-7 Convergence Deflection PCB LED. The Convergence Deflection PCB has only one LED. It illuminates green when power (±15 V) is present on the PCB.[...]

Chapter 7---Troubleshooting 7-10 Model 250 Service Manual Video A mpli fi er PCB LED Figure 7-8 Video Amplifier PCB LED. The VA_OK LED on the Video Amplifier PCB is illuminated g reen when all the CRT deflection circuits are operating properl y (/DEFL_OK), the suppl y voltage s (±15 V, +6.2 V, and +80 V) are present at the Video Amplifier PCB, and[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-11 Backplane PCB LEDs Figure 7-9 Backplane PCB LEDs on right side (exposed side)of PCB . The Backplane has t wo status LEDs, the / LV_OK signal from t he Low Volt age Power Supply, and the /HV_OK signal from the Hi gh Voltage Power Supply . Th e Backplane also has severa l connectors that can b[...]

Chapter 7---Troubleshooting 7-12 Model 250 Service Manual 7.3 Diagrams Command ON Timing Figure 7-10 POWER ON and POWER OF F command timing diagram. When the AC Circuit Breaker is powered O N, the Low Voltage Power Suppl y generates a +5.1 V Standb y voltage that goes to the System Controller PCB to power the CPU and IR Detectors. Th e Low Voltage [...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-13 to the Arc Lamp Power Supply low. The Arc Lamp Power Supply delivers 170 V to the Igniter, which generates a 32 kV pulse to the Arc Lamp and the Arc Lamp lights. Once the Arc Lamp lights, the Arc Lamp Power Supply, the /LAMP_LIT signal goes low and the voltage to the Igniter drops to between[...]

Chapter 7---Troubleshooting 7-14 Model 250 Service Manual Image Path Figure 7-11 RGB I mage path f rom VIC to CRT. The image signals can be in the form o f separate red, green and blue component signals with separate horizontal and vertical s ync signals or they can be a composite imag e signal with all the image and sync signals combined into one [...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-15 Deflection Path Figure 7-12 CRT Deflec tion path from Raster Timing Generator PCB . The Raster Timing Generator PCB receives the horizontal and vertical sync pulses from the Video Processor PCB, and uses a Phase Locked Loop circuit to lock to the horizontal sync. It sends a sample of the hor[...]

Chapter 7---Troubleshooting 7-16 Model 250 Service Manual The Horizontal Vertical Deflection PCB outputs H_OUT_FLYBACK to the Scan Reversal PCB. This is the horizontal deflection waveform that drives the horizontal CRT deflection yokes. The H_RED+, GRN+, and BLU+ are the horizontal deflection returns. The outputs of the vertical amplifier a re V_RE[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-17 Figure 7-13 CRT Deflection path between Horiz/Vert Deflection PCB, Convergence Deflection PCB and Scan R eversal PCB.[...]

Chapter 7---Troubleshooting 7-18 Model 250 Service Manual Figure 7-14 CRT Deflection path between the Scan Reversal PCB and CRT.[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-19 CRT Protection Figure 7-15 CRT Protection path The CRT Protection circuit is designed to protect the CRTs in case an y of the CRTs is not recei ving a horiz ontal or vertical de flection wav eform. If there are no deflection waveforms, the electron gun inside the CRT will shoot an electron b[...]

Chapter 7---Troubleshooting 7-20 Model 250 Service Manual Amplifier PCB the /SWEEP_OK be comes the /VA_OK signal and checks the supply voltages such as +15 V, +6.2 V and +80 V. The /V A_OK LED illuminates ( see Video Amplifier PCB LED ) if the supply voltages are present and the /SWEEP_OK is low. The /VA_OK also goes to the Hi gh Voltage Power Supp[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-21 Figure 7-16 CRT Protection path between the Scan Reversal PCB and CRT.[...]

Chapter 7---Troubleshooting 7-22 Model 250 Service Manual 7.4 Error Codes For certain errors that may occur in the Mod el 250 Projector the softwar e provides error cod es that are helpful in determining the nature of the problem. These error codes c an be seen on the left side of the monitor screen when usin g a PC connected to Port A or Port B. T[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-23 1.34 “No mem availabl e” Software error -no heap avail able for memor y allocation. 2.1 “ Invalid Sector” Software error -invalid Flash sector number. 2.2 “Write Timeout” Flash Memory Write Failure. 2.3 “Erase Timeout” Flash Memory Erase Sector Failure. 2.4 “Verify Error”[...]

Chapter 7---Troubleshooting 7-24 Model 250 Service Manual 4.17 “VIC1 Board Not OK” /VI C_OK is High (BAD) on VIC Slot 1. 4.18 “VIC 2 Board Not Ok” /VIC_OK is High (BAD) on VIC Slot 2 4.19 “VIC3 Board Not OK” /VI C_OK is High (BAD) on VIC Slot 3 4.20 “VIC1 Invalid Type” Software does not support V I C_ ID in Slot 1 4.21 “V IC2 Inva[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-25 7.5 Troubleshoo ting Guid e Table 7-3 lists some common projector problems, what to check when p roblems occur, and offers possible solutions. It indicates the section in this Service Manual that provides some related information on the problem. If the User’s Guide contains pertinent infor[...]

Chapter 7---Troubleshooting 7-26 Model 250 Service Manual Troubleshooti ng on the Backpl ane PCB The connectors on the Backpl ane PCB provide on e of the more a ccessible places to probe voltages and signals that may be useful for troubleshooting purposes ( see Figure 7-18 and associated list of signals and voltages ). Figure 7-17 Backplane Diagram[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-27 Figure 7-18 Backplane Diagram (m iddle secti on) The following is a list of pins that would be helpful for troubleshooting purposes. Low Vol tage Power Supply (J8) High Vol tage Pow er Supply (J7) Pin # Signal or Voltag e Pin # Signal or Voltag e 8 /LV_ENA 5 /HV_OK 9 /LV_OK 8 +80 V 10 +24 V_[...]

Chapter 7---Troubleshooting 7-28 Model 250 Service Manual Figure 7-19 Backplane Diagram (ri ght side)[...]

Chapter 7---Troubleshooting Model 250 Service Manual 7-29[...]

Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-1 8.0 Software and Protocol Contents 8.1 Software Updating........................................................................................ 8-1 8.2 Importing/Exporting ..................................................................................... 8-5 Configuration .........[...]

Chapter 8---Softwar e and Protocol 8-2 Model 250 Service Manual ! Cursor=Block & Blink ! Terminal Font=Fixedsys 15 ! Translation=None, ! Show Scroll Bars=On ! Buffer Lines=100 ! Use Function Arrow ! Control Keys for Windows=Off Select OK. 6. Under Settings selec t Text Transfer=Standard Flow Control. Select OK. 7. Under Settings select Communic[...]

Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-3 ***WARNING: IMPROPER USE MAY MAKE THIS SYSTEM UNBOOTABLE*** (This warning relates to the Flash Memory updating that occurs in Step 11D. Do not turn projector power off while the Flash Memory is updating) Memory buffer reset to 0xff Begin your S-Record upload now (Esc to abort). 11B. Fr[...]

Chapter 8---Softwar e and Protocol 8-4 Model 250 Service Manual Boot Manager Ver y.y.0 (Service Mode Startup) Copyright (c) 1994-1996 Hughes-JVC Technology Command: _ 12A. To update the S ystem Software from the Boot Manager prompt: 12B. Type in the command “loads ys” at the prompt. The following should be displayed: Command: loadsys System sof[...]

Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-5 The software update is complete. To restart the proje ctor, t y pe in the “sys” or “reboot” command and press Enter. Th e projector will now restart with the updated System Software. 8.2 Im porting/ Exporti ng Configuration Data Expor t / Import Procedure - Rev 1.0 .0 This appe[...]

Chapter 8---Softwar e and Protocol 8-6 Model 250 Service Manual Exporting 1. Make sure the Windows TERM INAL program is configured for SOFTWARE FLOW CONTROL (XON/XOFF). A corrupt Export file will result if SW flow control is not used. 2. Choose the directory and filename for savin g the Export Data. The Windows TERMINAL: Transfers: Receive Tex t Fi[...]

Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-7 . END A similar message is display ed on the projector screen : ================================= | Export Configuration | | EXPORT COMPLETE | | -> STOP Host Download | | -> THEN Press ESC | ================================= 10. Windows TERMINAL: Select the Windows TERMINAL STOP [...]

Chapter 8---Softwar e and Protocol 8-8 Model 250 Service Manual | Import Configuration | | Start SEND TEXT Upload from | | Host on Serial PORT A | | -To Abort: | | ->Stop Host Upload, | | ->THEN Press ESC to Abort | ================================= 6. Windows TERMINAL: Transfers + Send Tex t File.... 6.1 Directories - set director y to desir[...]

Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-9 FINALLY, press ESC to exit the projector Import operation and return to the Maintenance Menu. There is a 10 second pause before the s creen is redrawn. 9. DATA TRANSFER ERROR (Example) Model 250 Menu will display: ================================= | Import Failed | | Bad EXPORT File Fo[...]

Chapter 8---Softwar e and Protocol 8-10 Model 250 Service Manual 8.3 Termi nal s and Communicati on Pr otocols Terminals The projector can be controlled b y a VT-100 terminal. If a VT-100 is not available, a PC with Windows 3.1 or ProComm for DOS can emulate a VT-100. Table 8-1 shows the equivalent commands for the terminal and both r emotes. 1. Fr[...]

Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-11 Communications Protocol Select SETTINGS using the menu bar, then select COMMUNI CAT IONS. Set the following communications parameters and modes. Table 8-2 Communications se ttings Baud Rate 9600 Stop Bits 1 Data Bits 8 Flow Control Xon/Xoff Parity None Carrier Detect No Parity C heck [...]

Chapter 8---Softwar e and Protocol 8-12 Model 250 Service Manual Center, H & V (RGB) P POS 80 50 Change channel Number + Enter Channel # + Enter Channel # + Enter 48-57 30-39 + 0D Color Y COL OR COL OR 89 59 Contrast (RGB) C CONT CONT 67 43 Edge, H & V (RGB) E EDGE 69 45 Enter Enter ENTER ENTER 13 0D Escape Esc ESC ESC 27 1B Hi de F HID E H[...]

Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-13 *The Arrow ke ys are a sequence of Decimal or H ex numbers representing the sequence of Escape, Left Bracket, and A, B, C, or D dep ending on which arrow Is pressed. The first number repres ents the Escape key, the s econd number represents the Left Br acket, and the third number re p[...]

Chapter 8---Softwar e and Protocol 8-14 Model 250 Service Manual[...]

Chapter 9---Parts List Model 250 Service Manual 9-1 9.0 Parts List Contents 9.1 Replacement Parts List ................................................................................. 9-1 9.2 Spares ........................................................................................................... 9-3 9.1 Replacement Parts List Table 9-1 R[...]

Chapter 9---Parts List 9-2 Model 250 Service Manual Description Part no. Power Cord, USA/Japan 104499 Power Cord, Europe 103939 Power Supply, Arc Lamp 105216 Power Supply, High Voltage 102566 Power Supply, L ow Voltage 102520 Prism Tank Assembly 103942 Projection Lens, 0.96:1, Fixed 105134 Projection Lens, 1.5:1, Fixed 106687 Projection Lens, 2.4:1[...]

Chapter 9---Parts List Model 250 Service Manual 9-3 9.2 Spares It may be advisable to maintain a supply of spares for the p rojector to minimize downtime. This is particular ly important when projectors are being operate d on a continuous basis or when multiple projectors are needed. Table 9-2, below, provides a list of the spares that HJ T recomme[...]

Chapter 9---Parts List 9-4 Model 250 Service Manual[...]

Glossary Model 250 Service Manual A-1 Glossary of T erms Amor phous Without definite form; not crystallized. Arc Lamp The high intensity light source in the Model 250 projector. The Xenon Arc Lamp operates at high temperatures (160° to 200°) and produces dangerousl y intensive lig ht with hazardous levels of ultraviolet and infrar ed radiation. A[...]

Glossary A-2 Model 250 Service Manual Fiel d One half of a complete vid eo frame. Odd lines in one field and even lines in another m ake up one frame. Fra me One complete TV pi cture or scre en of information. It is composed of two fields and has a total of 525 scanning lines in NTSC transmission. Horizontal Scan Reverses the image projection for f[...]

Glossary Model 250 Service Manual A-3 Lume n A unit of measure of the flow, or rate of emission, of light measured with a Light Meter. An ordinary wax candle gener ates 13 lumens while a 100-watt bulb generates 1,200 lumens. Luminanc e Abbreviated as "Y." The portion of the YPbPr and S-image signal that contains the black and white inform[...]

Glossary A-4 Model 250 Service Manual S-Vide o An image signal that has the lumina nce (Y) information separate d from chrominance (C) information. Saturated Color 1) A color as far from white, black o r gra y as it can be (i.e., vermilion rather than pink). 2) A display misadjustment that results in unnaturally bright colors. Scan To scan, is to m[...]

Glossary Model 250 Service Manual A-5 alternating white and black horizontal lines that can be counted from the top of the picture to the bottom. Vert ical Scan Freque ncy The number of times per second a display image is written or refreshed. Vertical Scan Reverses the image verticall y for use with Reversal Jumper mirror-bounced displays. Located[...]