Tektronix 071-1143-01 manual

Ser vic e Manual WFM 90D and WFM91D Handhe ld W avef orm , V ec tor , Pic tur e , and Audio Monitor 071-1 143-01 This doc ume nt appl ie s to fi rmwa re ve rs ion 2.13 and a bove. Wa r n in g The se rvi ci ng inst ruc ti ons ar e for us e by quali fi ed per sonne l onl y . T o avoi d per sona l i njur y , do not per for m a ny se rvi ci ng unle ss [...]

Copyright © T ektroni x, Inc. All ri ghts reserved. T ektronix produc ts are covere d by U.S. and fore ign pat ents, i ssued and pendi ng. Informa tion i n thi s publica tion superc ede s that in a ll pre viously publ ished ma teri al . Speci fica tions and pri ce change privi lege s reserved. T ektronix, Inc ., P .O. Box 500, Beaverton, OR 97077 [...]

W ARRANTY T ektronix warrants t hat the products t hat it manufa cture s and sel ls wil l be free from de fec ts in mat eria ls and workmanship for a pe riod of one (1) year from the dat e of shipme nt. If a product proves defe cti ve during this warranty peri od, T ektroni x, at it s option, e it her will repa ir the defe cti ve product wit hout c[...]

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WFM90D and WFM91D Servic e Manual i T able of Contents Gen eral S afety S u mmary vii ................................... Serv ice S afety Su mma ry ix .................................... Pr eface xi ................................................... About Thi s Manual xi ............................................... Related M anuals xi .......[...]

T able of Contents ii WFM90D and WFM91D Servic e Manual V ariable G ain Range and V ertical Po sition R ange 4- - 7 ....................... Ov erscan 4- -8 ....................................................... Input and DC Re storer Frequenc y Response 4- - 9 ........................... V ector P hase S tability 4- - 1 1 .........................[...]

T able of Contents WFM90D and WFM91D Servic e Manual iii Connect or Diagra m 6- - 59 .............................................. Opt ions Options 7 - - 1 ........................................................ Acces so ries 7- - 2 ..................................................... Replaceabl e Mechanical Par ts Replaceable Part s L ist 8- - [...]

T able of Contents iv WFM90D and WFM91D Servic e Manual List of Figures Figure 2- - 1: Installing the viewing h ood 2- - 2 ....................... Figure 2- - 2: Installing the d esk stand 2- - 2 .......................... Figure 2- - 3: Packing the Op tion 33 travel case 2- - 3 .................. Figure 2- - 4: Removing the NiMH batter y pack 2- -[...]

T able of Contents WFM90D and WFM91D Servic e Manual v Figure 6- - 15: Batter y contact installation alignment 6- - 32 ............. Figure 6- - 16: Batter y p ower -wir e and turnlock stud r ecep tacl e installation 6- - 33 ............................................ Figure 6- - 17: Batter y orientation marker position 6- - 36 ............... Fig[...]

T able of Contents vi WFM90D and WFM91D Servic e Manual List of T ables T ab le 1 - - 1: V ertic al deflect ion system 1- - 2 ......................... T ab le 1- - 2: DC re storation 1- - 4 ................................... T ab le 1- - 3: Aud io mode 1- - 5 ..................................... T ab le 1- - 4: Horizontal deflec tion system 1- -[...]

WFM90D and WFM91D Servic e Manual vii General Safety Summar y Review the f ollowing safety pr eca utions to avoid injury and pr event dama ge to this product or any produc ts connecte d to it. T o avoid potentia l h azard s, us e this produc t only as specif ied. Only qualified personnel should perform servic e pr ocedur es. While using this pr odu[...]

Gener al Safety Summar y viii WFM90D and WFM91D Service Manual T erm s in this M anual. These terms may appea r in this manual: W ARNING. W arning statements identify c onditions or practices that c ould r esult in injury or loss of life. CAUTION. Caution stateme nts identify conditions or prac tices that could r esult in damage to this pr oduct or[...]

WFM90D and WFM91D Servic e Manual ix Service S afety Summary Only qualifie d personnel should pe rform se rvice pr ocedure s. R ead this Servic e Safety Summary and the Gene ral Safety Summary befor e perf orming any ser vice proce dures. Do Not Service Alone. Do not perfor m internal servic e or adjustments of this product unle ss another pe rson [...]

Service Saf ety Summary x WFM90D and WFM91D Servic e Manual[...]

WFM90D and WFM91D Servic e Manual xi Preface This manual pr ovides instructions f or servic ing the WFM90D and W F M91D Handheld W avef orm, V ec tor , Picture, a nd Audio Monitors. This manual descr ibes fea tures and spe cifica tions that are common to all ge nerator modules. These include syste m configuration and the common contr ol interf ace.[...]

Preface xii WFM90D and W FM91D S ervic e Manual Cont acti ng T ektr onix Phone 1-800-833-9200 * Address T ekt ronix, Inc. Departm ent or name (if known) 14200 SW Karl Braun Drive P .O. Box 500 Beave rton, OR 97077 USA Web si te www .te ktroni x.com Sales support 1-800-833-9200, selec t opti on 1 * Service support 1-800-833-9200, selec t opti on 2 *[...]

Speci fi cati ons[...]

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WFM90D and WFM91D Servic e Manual 1- 1 Specifications This section inc ludes the following inf ormation: H Product desc ription H Specific ations tables Product Descr ipt i on The ha ndheld, self- contained, T ektronix WFM90D and W FM91D television wavef orm monitors ca n monitor analog a nd digital signals. The monitors pr ovide composite a nd com[...]

Specific ations 1- 2 WFM90D and W FM91D S ervic e Manual Charact eri st ics T ables The tables use the following abbr eviations: Perfor mance Requirem ent (Req) . All perf ormance r equireme nts in the specific a- tion tables a re identif ied with Req , and can be a ssured by comple ting the Perfo rman ce Ch eck P rocedu re lo cated i n th e serv i[...]

Specific ations WFM90D and WFM91D Servic e Manual 1- 3 T able 1 - 1: V ertical deflection system ( Cont.) Category Descr iption Deflect ion Fact or REQ: Analog I nput, 1 V Ful l Scale: 1 V input di splayed wi thin 1% of 140 I RE REF: Flat filt er selected. REQ: Digi tal I nput, 1 V Full Scale: 1 V input di splayed wi thin 2% of 140 I RE REF: Flat f[...]

Specific ations 1- 4 WFM90D and W FM91D S ervic e Manual T able 1 - 1: V ert ical deflection syst em (Cont .) Category Descr iption Tr ansient Response Digit al Input REF: Specif icat ions apply f or full screen height video input si gnal, wi th V AR GAI N off, 1 V Ful l Scale or X5 Gain selected, and FLA T f ilt er selected. REF: Pulse-to-Bar Rati[...]

Specific ations WFM90D and WFM91D Servic e Manual 1- 5 T able 1 - 3: Audio mode Category Descr iption Reference Levels REQ : - - 10 dBu, 0 dBu, +4 dBu, +8 dBu. REF: Nomi nal M IC reference: - - 50 dBu. Measurement Accuracy REQ: 0.5 dB at 1 kHz. Frequency Response REQ : 0 . 5d Bf r o m5 0H zt o2 0k H z . Maxim um Input Level Am plit ude REF: +18 dBu[...]

Specific ations 1- 6 WFM90D and W FM91D S ervic e Manual T able 1 - 5: V ector m ode Category Descr iption Chrominance Processing Nomi nal Subcarrier Frequency (F SC ) REF: NTSC: 3. 579545 MHz. P AL: 4. 43361875 MHz. Chrominance Processing Chrominance Bandwi dth REQ: Upper - - 3 dB Poi nt: F SC +500 kHz,  100 kHz. Lower - - 3 dB Poi nt: F SC - -[...]

Specific ations WFM90D and WFM91D Servic e Manual 1- 7 T able 1 - 6: Synchronization Category Descr iption Input Requirement s REQ: Int ernal Reference Analog Input : Composit e video or black burst wi th sync ampl itudes 40 I RE (300 mV P AL)  6 dB. Digit al Input : 270 Mbit ( 259M ). REQ: External Reference: Sync ampli tude bet ween 143 mV and[...]

Specific ations 1- 8 WFM90D and W FM91D S ervic e Manual Physical Char act eri sti cs T able 1 - 8: Physical charact eristics Category Descr iption Dimensi ons REF: I nstrument: 5 inches (127 mm). 3.15 inches (80.0 m m). 9.6 inches (243.8 m m). Shipping Box: 13.25 x 13.75 x 6 i nside 14 x 14.25 x 6.25 out side Weight REF: Wi th bat teries and pouch[...]

Specific ations WFM90D and WFM91D Servic e Manual 1- 9 Ce rtific a tio n an d C o mp li ances T able 1 - 10: Certifications and Compliances Category St andards or description EC Declaration of Conformity - - EMC Meets t he int ent of Di rective 89/336/ EEC for Elect romagnetic Com patib ility . Compli ances were demonstrated usi ng EN 61326:1997 EM[...]

Specific ations 1- 1 0 WFM90D and WFM91D Service Manual T able 1 - 10: Certifications and Compliances (Cont.) Category Standards or descript i on Pollut ion Degree Pollut ion Degree 2 (as defined i n IEC 61010-1). Note: Rat ed for indoor use only . Pollut ion Degree Descripti ons A measure of the cont ami nates that coul d occur in the envi ronment[...]

Operat ing I nfor mati on[...]

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WFM90D and WFM91D Servic e Manual 2- 1 Installation This section c ontains the following inf ormation: H Mecha nical insta llation instructions H Electr ical insta llation instructions H Opera ting instructions that relate to the se rvice of this instrument Mechani cal Inst all ati on Before insta lling the WFM90D or WFM91D Handheld W avef orm, V e[...]

Installa tion 2- 2 WFM90D and W FM91D S ervic e Manual Figu r e 2 - 1: Inst allin g th e viewin g hood The desk sta nd holds the monitor upright on a flat sur f ace. In sert t he p r ongs of the stand into the holes in the back of the instrument as shown in F igure 2- - 2. Figu r e 2 - 2: Inst allin g th e des k st an d Desk Stand[...]

Installa tion WFM90D and WFM91D Servic e Manual 2- 3 The tra vel case (Option 33) c an safe ly hold the handheld monitor and its acce ssories while tra veling between loca tions. The case also holds a companion handheld TSG95 or TSG601 genera tor . The travel case c ompartme nts (see Figure 2- - 3) hold the following items: 1. S ignal cable s and u[...]

Installa tion 2- 4 WFM90D and W FM91D S ervic e Manual Elect r ical I nstal lat ion Follow these instructions for ele ctric al installation. There a re no internal jumper se ttings for these monitors. Instrument conf igura- tion is through the CONFIG menu ( refe r to page 2- - 21). The WFM90D and WFM91D handheld monitors ar e designed to ope rate f[...]

Installa tion WFM90D and WFM91D Servic e Manual 2- 5 NOTE . T o prevent a loss of battery power , be sur e that the battery connec tor tab snaps on to the jumper housing. Press Grasp wire Figure 2 - 4: Removing the NiMH battery pack Y ou can use six alka line batter ies to power the WFM90D and WFM91D , howe ver , the batter y life may be limited. N[...]

Installa tion 2- 6 WFM90D and W FM91D S ervic e Manual Figure 2 - 5: Inside of the batter y compart ment , show ing polarity mar kings[...]

WFM90D and WFM91D Servic e Manual 2- 7 Functional Overview This section de scribes the WFM90D and WFM91D controls and c onnectors. Keypad Cont rol s The keypad (f ront panel) is illustrate d in F igure 2- - 6. ON. The ON button toggles the instrument power on and of f. The curre nt instrument ke ypad and menu se lections ar e saved whe n you turn o[...]

Functional Over view 2- 8 WFM90D and W FM91D S ervic e Manual WFM90D Press and hold for two seconds to open the digit al menu for the selected operating m ode Figure 2 - 6: W FM90D keypad[...]

Functional Over view WFM90D and WFM91D Servic e Manual 2- 9 The menus use a combination of onscr een rea dout and multi-use buttons, in conjunction with the Arrow Buttons, to control most of the monitoring f unctions. Menus are e ntered by pressing one of the MENU, CONF IG, or LINE S EL buttons. Menus are exited by pr essing the entr y button for t[...]

Functional Over view 2- 1 0 WFM90D and WFM91D Service Manual Extraor dinary conditions ma y cause the WFM90D and WFM91D controls to become locked or to respond e rratic ally . T o re set the instrume nt, first pr ess the ON button to turn of f the powe r , then press the ON button again while holding down the WI P and CONF IG buttons. The instrume [...]

Functional Over view WFM90D and WFM91D Servic e Manual 2- 1 1 CAUTION. DC Power Sour ce T o avoid possible damage to the instrument cir cuitry when using a DC power sour ce other than the supplied AC adapter , ensur e that the DC sour ce is a negative -gr ound 1 1 - - 18 V system with a negative cente r lead. T he DC sour ce should be able to prov [...]

Functional Over view 2- 1 2 WFM90D and WFM91D Service Manual Onscr een Readouts The WFM90D and WFM91D use onscree n messages to a lert you to ce rtain monitoring conditions. Figure 2- - 8 shows example rea dout messages a nd their locations. 20 40 60 80 100 - -2 0 - -4 0 0 GAIN UNCAL 10uS /DIV EXT REF VX.XX LOW BA T 10 3 6 11 8 9 DIGI T A L NO SYN [...]

Functional Over view WFM90D and WFM91D Servic e Manual 2- 1 3 6. The swee p rate is only displa yed in the W aveform displa y mode. There is no sweep r ate re adout when 2 Field swee p is selecte d. 7. When the CR C W atch is tur ned on, the ERR ORED SEC ONDS message block appe ars. 8. The LOW BA T message is displaye d when the instrument is batte[...]

Functional Over view 2- 1 4 WFM90D and WFM91D Service Manual[...]

WFM90D and WFM91D Servic e Manual 2- 1 5 Using the Menus This section de scribes the opera ting and configur ation menus for the WFM90D and WFM91D . Figure 2- - 9 and Figure 2 - - 10 show the complete menu struc ture for all of the opera ting menus. F igure 2- - 12 (on page 2 - - 22) shows the menu structure f or the Configuration me nu. Some menu [...]

Using the Menus 2- 1 6 WFM90D and WFM91D Service Manual AUDIO + MENU *Hold MENU butt on two seconds for digital m enu PIX + MENU WFM VECT AUDIO LOCA TION UPPER LEF T/ UPPER RI GHT/ LOWE R RIGHT/LOW ER LEFT WIP + M ENU ACTI ON — OFF/ ON (WF M90D only) TITLE — OFF/O N (WFM90D on ly) SAFE AREA — OF F/ ON (WF M91D only ) V SHIFT — OFF/ON REFERE[...]

Using the Menus WFM90D and WFM91D Servic e Manual 2- 1 7 Oper ati ng Menus The following pa ges descr ibe the oper ating menus, shown in Figure 2- - 9 and Figure 2- - 10. Each ope rating mode ha s an associa ted menu. In addition, the W avefor m, V ector , Picture, and W IP operating mode s have an a ssociated digita l menu. Opera ting menu selec t[...]

Using the Menus 2- 1 8 WFM90D and WFM91D Service Manual T able 2 - 2: Wavefor m m enu choices, analog and di gital Submenu Digi tal only Function GAIN Sets t he Waveform displ ay mode vertical gai n and the V ector display m ode gain t o X1 or X5. FIL TER Selects FLA T (unfil tered di splay) or LUM (low-pass fil tered for lum inance displ ay). SWEE[...]

Using the Menus WFM90D and WFM91D Servic e Manual 2- 1 9 Press the AUDI O button and the MENU button to open the Audio opera ting menu. There is no digital menu for audio. For more details on menu access , see page 2- - 17. Audio menu choic es are shown in T able 2- - 3. The Audio menu tre e is shown in Figure 2- - 10. T able 2 - 4: Audio menu choi[...]

Using the Menus 2- 2 0 WFM90D and WFM91D Service Manual Press the W IP button and the MENU button to open the W avef orm-in-Pictur e opera ting menu. Hold the MENU button in for two se conds to open the digita l menu . F o r more d etail s o n men u access , s ee pag e 2 - - 1 7. WIP menu c hoices ar e shown in T able 2- - 5. The WIP menu tr ee is [...]

Using the Menus WFM90D and WFM91D Servic e Manual 2- 2 1 Confi gur ati on Menu The following pa ges descr ibe the instrume nt configura tion menu, shown in Figure 2- - 12 on page 2- - 22. Menu ca tegories a nd functions ar e descr ibed in T able 2- - 7. T o enter the Configura tion menu, press the CONFIG button. T o exit the c onfiguration me nu, p[...]

Using the Menus 2- 2 2 WFM90D and WFM91D Service Manual CONFIG DISPLA Y INT EN S INPU T V ARGAIN VECTOR PICTURE* TIM E-OU T ALARMS PRESETS CABLE RPT SETUP CTL INPU T CT L *Must be in PI X mode to adjust VIEW VIEW ADJUST BRIGHT BRIGHT ADJUST TRACE TRACE ADJUST GRA T GRA T ADJUST DC REST SLOW /F AST REF INT/EXT V ARGAIN ON/OFF BARS 75% / 100% SETUP N[...]

Using the Menus WFM90D and WFM91D Servic e Manual 2- 2 3 T able 2 - 7: Conf igure menu choices Category Submenu Function DISPLA Y VI EW The right t wo bezel butt ons adjust t he viewing angl e of t he LCD display up or down to al low opt ional vi ewing of t he displ ay from different positi ons. BRIGHT The right t wo bezel but tons adjust t he brig[...]

Using the Menus 2- 2 4 WFM90D and WFM91D Service Manual T able 2 - 7: Conf igure menu choices (Cont .) Category Funct ion Submenu TIME-OUT BACK L T Y ou can set t he instrument to shut down power to the backl ight after 2 m inutes or 5 m inutes of i nactivi ty . SHUTDOWN Y ou can set t he inst rument to power down aft er 5 minutes or 10 minut es of[...]

Using the Menus WFM90D and WFM91D Servic e Manual 2- 2 5 T able 2 - 8: Default instr ument set tings Display m ode Wavefor m Signal reference Inter nal Filter Flat DC restorer speed Slow Gain X1 V ariable gai n Off Sweep 2H (2 Line) Mag Off Bars 75% Setup (WFM90D onl y) Ye s Alt Phase (WFM 91D only) Off Reference dBu 0 dBu Headroom 3d B WIP l ocati[...]

Using the Menus 2- 2 6 WFM90D and WFM91D Service Manual Line Select M enu Enter the W aveform, V ector , or WIP opera ting mode. Press the LI NE SEL button to turn on Line Select mode and open the Line Selec t menu. The number of the selec ted line and/or field displa ys in the menu bar over the right two B ezel B uttons. The Line Sele ct menu is s[...]

Theory of Oper ati on[...]

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WFM90D and WFM91D Servic e Manual 3- 1 Theory of Operation This section contains a module- level descr iption of the instrument circuitr y . The descr iption is based on the bloc k diagram in Figure 3- - 1. (For se rial numbers below B020100, see Figure 3 - - 2). Input Boar d The signal input a nd output connector s are loc ated on the I nput board[...]

Theory of Oper ation 3- 2 WFM90D and W FM91D S ervic e Manual T op Board The T op board contains the micr oprocessor c ircuitry , the rasteriz er and graphic s gener ator , the subcar rier oscilla tor , and the timing genera tor . Microprocessor . The micropr ocessor take s input from the front- panel keypad to control the opera tion of the instrum[...]

Theory of Oper ation WFM90D and WFM91D Servic e Manual 3- 3 16 Input Board Ref Va r Gain Ext Ref Audio In Video In Video Out Front Panel Keys Part of  P Rasterizer and Graphics Ve r t D e f l Horiz Defl Instrum ent Control Botto m Bo ard P/O T op Board LCD Display Board RGB P/O T op Board Part of  P Timin g Subcarrier Oscillator Timin g Sel V[...]

Theory of Oper ation 3- 4 WFM90D and W FM91D S ervic e Manual 16 Input Board Ref Va r Gain Ext Ref Audio In Video In Video Out Front Panel Keys Part of  P Rasterizer and Graphics Ve r t D e f l Horiz Defl Instrum ent Control Botto m Bo ard P/O T op Board LCD Display and Backlight Board Backlight Power Supply Board RGB P/O T op Board Part of  [...]

Perf ormance V eri fi cati on[...]

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WFM90D and WFM91D Servic e Manual 4- 1 Perfor mance V erification This section c ontains the following inf ormation: H Summary ver ification pr ocedure H List of equipme nt require d to perf orm the proc edures H Perfo rman ce V erifica tion P roc edures: Ana log S ec tion H Perfo rman ce V erifica tion P roc edures: Digita l S ec tion Perfor m the[...]

Perfo rman ce V erifica tion 4- 2 WFM90D and W FM91D S ervic e Manual The tests in this se ction comprise a valid c onfirmation of instrument pe rforma nce when the following requir ements are me t: H T est equipme nt used to verif y perfor mance r equireme nts must be calibr ated and working within the limits specif ied in T able 4- - 2 on page 4-[...]

Perfo rman ce V erifica tion WFM90D and WFM91D Servic e Manual 4- 3 T able 4 - 1: Sum mar y verification procedure (Cont .) Procedure Page # Procedure r equirement V ector phase st ab ility Phase Shift wi th Subcarrier Frequency Change from F SC to F SC  50 Hz (F SC  10 Hz P AL):  2 ° . Phase Shi ft wi th Burst Am plit ude Change from Nom[...]

Perfo rman ce V erifica tion 4- 4 WFM90D and W FM91D S ervic e Manual T able 4 - 2: Equipment r equired for per form ance verification (Cont.) Equipment description Equipment exam ple Mini mum requirements Function generator Range: 0.1 t o 5 Vpp when loaded by 75 Ω , 10 Vpp when unloaded; Frequency: 50 kHz to 10 MHz. T ektronix FG 503 3 Funct ion[...]

WFM90D and WFM91D Servic e Manual 4- 5 Perfor mance V erification: Analog S ection Perfor m the following steps before beginning the ver ification proc edure s: 1. Plug the AC power ada pter into the instrument and then plug the adapter into the AC power source. 2. Connect the multibur st signal from the analog te levision signal gene rator through[...]

Perfo rman ce V erifica tion: Analog Section 4- 6 WFM90D and W FM91D S ervic e Manual Sweep T im ing and I ntegr al Li neari ty This proce dure ver ifies the f ollowing require ment: Sweep T iming Accura cy: 5  s/Div . (1 Line) , 10  s/Div . (2 Line), and 1.0  s/Div . (2 Line + MAG),  2%. 0. 2  s/Div . (1 Line + MAG)  3%. Integra [...]

Perfo rman ce V erifica tion: Analog Section WFM90D and WFM91D Servic e Manual 4- 7 V ert ical G ain and V ert ical M agnif ier Regi str ati on This procedur e verifie s the following requireme nt: 1 V olt Full Scale: 1 V input displaye d within 1% of 140 IRE (1.00 V P AL). X5 Gai n: G ain accuracy within 5% with 1 V input signal. X5 Gain Registra [...]

Perfo rman ce V erifica tion: Analog Section 4- 8 WFM90D and W FM91D S ervic e Manual 2. Sel ect V AR GAIN ON from the Configura tion menu. 3. Check by adjusting the V ariable Gain controls that the signal amplitude ca n be displaye d less than 70 IRE (500 mV P AL). 4. Set the V AC for a 799.9 mV output. 5. Check by adjusting the V ariable Gain con[...]

Perfo rman ce V erifica tion: Analog Section WFM90D and WFM91D Servic e Manual 4- 9 Input and DC Restorer Fr equency Response This procedur e verifie s the following requireme nt: X1 Gain Response (Flat filter sele cted): 50 kHz to 6 MHz within 2% of response at 50 kHz. X5 Gain Response (Flat filte r selec ted): 50 kHz to 6 MHz within 5% of respons[...]

Perfo rman ce V erifica tion: Analog Section 4- 1 0 WFM90D and WFM91D Service Manual 17. Adjust the peak-to- peak detec tor Plus amplifier a nd input control fully counter clockwise. 18. Adjust the sine wave gener ator for a display amplitude of 100 IRE (700 mV P AL). 19. Note the digital multimeter r eadout level or the oscillosc ope DC level. 20.[...]

Perfo rman ce V erifica tion: Analog Section WFM90D and WFM91D Servic e Manual 4- 1 1 V ector Phase Stab ility This procedur e verifie s the following requireme nt: Phase Shift with S ubcar rier Freque ncy C hange f rom F SC to F SC  50 Hz (F SC  10 Hz P AL):  2 ° . Phase Shift with B urst Amplitude Change from Nominal to  6d B :  2[...]

Perfo rman ce V erifica tion: Analog Section 4- 1 2 WFM90D and WFM91D Service Manual Chrom inance Bandwi dt h This proce dure ver ifies the f ollowing require ment: Chrominance Bandwidth: Upper - - 3 dB Point: F SC + 500 kHz,  100 kHz. Lower - - 3 dB Point: F SC - - 500 kHz,  100 kHz. 1. Connect the prec ision 50 Ω cable to the output of th[...]

Perfo rman ce V erifica tion: Analog Section WFM90D and WFM91D Servic e Manual 4- 1 3 8. Incr ease the fr equency on the levele d sine wave gener ator until the edge of the cir cle display e xpands out to the compa ss rose and a gain reduc es to the - - 3 dB (70%) point gaps on the vertica l graticule a xis. S ee Figure 4- - 1. 9. Check that the fr[...]

Perfo rman ce V erifica tion: Analog Section 4- 1 4 WFM90D and WFM91D Service Manual 13. Sel ect - - 10 dBu from the Oper ating menu. 14. Check that the display amplitude is within 0.5 dB of the ref erenc e level gratic ule lines. 15. Set the audio genera tor for a 50 Hz tone output, with an amplitude of +8.0 dBu. 16. Sel ect 8d B u from the Opera [...]

WFM90D and WFM91D Servic e Manual 4- 1 5 Perfor mance V erification: Digital Section Perfor m the following steps before beginning the ver ification proc edure s: 1. Plug the AC power ada pter into the WFM90D or WFM91D monitor and then plug the adapter into the AC power source . 2. Connect the 75% color bar signa l from the digital television signa[...]

Perfo rman ce V erifica tion: Digital Section 4- 1 6 WFM90D and WFM91D Service Manual 6. Check that the displayed vide o is 714 mV ,  2% (appr oximately 1/4 major division) from gra ticule baseline to white bar ( 0 IRE to +100 IRE for 525 or 0 V to +700 mV f or 625). 7. Set the COMP SE L to BLUE . 8. Check that the displayed vide o is 714 mV , ?[...]

Perfo rman ce V erifica tion: Digital Section WFM90D and WFM91D Servic e Manual 4- 1 7 Check Frequency Response at X5 Gain This procedur e verifie s the following requireme nt: Flat Filter , X5 Gain, 50 kHz to 4.5 MHz, within 5%. 1. Select the WFM mode on the WFM90D or WFM91D monitor . 2. Pre ss MENU to display the wavef orm menu. 3. Set the GAIN t[...]

Perfo rman ce V erifica tion: Digital Section 4- 1 8 WFM90D and WFM91D Service Manual[...]

Adjust ment Procedur es[...]

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WFM90D and WFM91D Servic e Manual 5- 1 Adjustments This section c ontains the following inf ormation: H Summary adjustme nt procedur e H List of equipme nt require d to perf orm the proc edures H Adjustment proc edures Summ ary Adj ustment T able 5- - 1 is a cross-r efer ence to the adjustment proc edure steps. T abl e 5 - 1: Summary a dju stment A[...]

Adjustments 5- 2 WFM90D and W FM91D S ervic e Manual Equipm ent Requir ed T able 5- - 2 lists the equipme nt require d to adjust the instrume nt settings. T able 5 - 2: Equipment required for adjustment s Equipment description Minim um requirements Equipment exam ple Analog tel evisi on test si gnal generator 75% col or bar test si gnal f or the te[...]

Adjustments WFM90D and WFM91D Servic e Manual 5- 3 Adjust ment Pr ocedures The monitor does not have any interna l adjustments. All adjustments are ma de through the Calibr ation menu using the f ront panel buttons. The adjustment proc edure steps ar e sequential. If you are unsur e of equipment connec tions or front-pane l settings for a specific [...]

Adjustments 5- 4 WFM90D and W FM91D S ervic e Manual[...]

WFM90D and WFM91D Servic e Manual 5- 5 Adjustment P rocedures: Analog S ection Perfor m these steps to prepare the instr ument to be adjusted: 1. Plug the AC power ada pter into the WFM90D or WFM91D, and then plug the adapte r into the AC power sourc e. 2. Set the input ter mination switches to the HIZ position. 3. Connect a 75% color bar signa l f[...]

Adjustment Proce dures: Analog Sec tion 5- 6 WFM90D and W FM91D S ervic e Manual 6. Sel ect CAL MENU , and then sele ct SA VE . 7. Set the func tion genera tor fre quency to 100 kHz. 8. Sel ect 2H SWEEP f rom the Operating menu. 9. Sel ect 2H SWEEP f rom the Calibra tion menu, and then sele ct CAL . 10. Adjust the arr ow but tons for one c ycle per[...]

Adjustment Proce dures: Analog Sec tion WFM90D and WFM91D Servic e Manual 5- 7 V ert ical Gai n and X5 Gai n Regist rat ion Perfor m these ste ps to adjust the ver tical gain a nd X5 gain registr ation: 1. Replace the signal on the VIDEO IN connector with the output from the V AC. Do not terminate the input. 2. Set the V AC for a 999.9 mV output wi[...]

Adjustment Proce dures: Analog Sec tion 5- 8 WFM90D and W FM91D S ervic e Manual 2. Connect one side of the dual-input couple r to the VIDEO IN connector . 3. Connect the T ektronix pa rt number 015- 0413-00 Peak-to- P eak De tector Head to the other end of the dual- input coupler , using the female -to-fe male BNC connector . 4. Connect the other [...]

Adjustment Proce dures: Analog Sec tion WFM90D and WFM91D Servic e Manual 5- 9 23. Sel ect CAL MENU , and then sele ct SA VE . 24. Sel ect X1 GAIN from the Oper ating menu, and INT RE F from th e Configuration me nu. V ector Q uadrat ure Phase Perfor m these steps to adjust the vector quadra ture phase: 1. Replace the signal on the VIDEO IN connect[...]

Adjustment Proce dures: Analog Sec tion 5- 1 0 WFM90D and WFM91D Service Manual Y ellow Cyan Blue Blue Figure 5 - 1: NTSC gr aticule show ing the vect or gain adjustment 7. Sel ect PHASE and use the arr ow butt ons to position the bur st vector exac tly on the 180 _ gra ticule line. 8. Sel ect X5 GAIN , and then sele ct X5 PHASE . 9. Use the ar r o[...]

WFM90D and WFM91D Servic e Manual 5- 1 1 Adjustment P rocedures: Digital S ection Perfor m the following steps to prepar e the instrument to be adjusted: 1. Plug the AC power ada pter into the WFM90D or WFM91D, and then plug the adapte r into the AC power sourc e. 2. Set the input ter mination switches to the 75 Ω position on the W F M90D or WFM9[...]

Adjustment Proce dures: Digital Sec tion 5- 1 2 WFM90D and WFM91D Service Manual Frequency Response Perfor m the following steps to a djust the fre quency re sponse: 1. Set the digital signal genera tor for a Pulse and Bar signal. 2. Sel ect DG X1 FREQ from the Calibr ation menu, and then se lect CAL . 3. Moving betwee n position control (POS) and [...]

Adjustment Proce dures: Digital Sec tion WFM90D and WFM91D Servic e Manual 5- 1 3 Cable M argi n Perfor m the following steps to adjust the cable mar gin indicator ( you are adjusting the va lue at which the cable flag c omes on to 200 meter s): 1. Connect the output f rom the digital signa l gener ator to the W F M90D or WFM91D through the cable c[...]

Adjustment Proce dures: Digital Sec tion 5- 1 4 WFM90D and WFM91D Service Manual[...]

Maint enance[...]

[...]

WFM90D and WFM91D Servic e Manual 6- 1 Maintenance The maintena nce or servic e of this instrument must be performe d only by qualifie d service personne l who have re ad the Se rvice Safety Summary a nd the Operating Information se ctions of this manua l. CAUTION. I f the instrument does not func tion pr operly , perform tr oubleshooting and take [...]

Maintena nce 6- 2 WFM90D and W FM91D S ervic e Manual Instrume nt performa nce should be checke d after each 2000 hour s of opera tion or ever y 12 months. This will help to ensure ma ximum perfor mance a nd assist in locating de fects tha t may not be appa rent during r egular ope ration. Perfor mance V erifica tion and Adjustment Proce dures ar e[...]

WFM90D and WFM91D Servic e Manual 6- 3 Remove and R eplace This section tells you how to remove and re place the custome r repl aceable modules and parts of the WFM90D or WFM91D Handheld W ave form, V ector , Picture, and Audio Monitor . CAUTION. T o prevent damage to the instrument, disconnect the power adapter and r emove installed batterie s fro[...]

Remove and Replace 6- 4 WFM90D and W FM91D S ervic e Manual Procedur es T able 6- - 2 lists the re move and re place pr ocedure s in this section and the ir starting page numbe rs. T able 6 - 2: Rem ove and replace procedure list Replaceable part Page number T op cover 6- -5 LCD display l ens 6- -5 LCD Display Assem bly B020100 and above 6- -8 LCD [...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 5 T op Cover Assem bly The top cover asse mbly contains repl aceable s ubparts. P roc edures for r emoving the subparts ar e included below . Remove. T o remove the top cover a ssembly: 1. Remove the six r etaining scr ews using the T orx-tip scr ewdriver . S ee Figure 6- - 1. 2. Gently lift t[...]

Remove and Replace 6- 6 WFM90D and W FM91D S ervic e Manual 1. Align the LCD display lens with the depre ssion in the back side of the top cover and pre ss the lens into pl ace. 2. Install the top cover . R efe r to T o p C over on page 6 - - 5. Remove T orx screws (6) Figure 6 - 1: Rem oving the top cover[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 7 LCD Di splay Assembl y The LCD display asse mbly does not contain a ny repl aceable s ubparts. If you need to r eplace any par t of the display a ssembly , you must replac e the entir e assembly . CAUTION. T o avoid damaging the LC D display , do not touch the fac e of the display bec ause i[...]

Remove and Replace 6- 8 WFM90D and W FM91D S ervic e Manual For instruments with se rial number s B020100 and above. Remove. T o remove the LCD Display assembly: 1. Remove the top cover . R ef er to T o p Co ver on page 6 - - 5. 2. Grasp the sides of the Display asse mbly and lift the a ssembly as shown in Figure 6- - 2 so that you ca n acces s th [...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 9 5. If you repl aced th e LCD display , care fully remove the prote ctive plastic cover f rom the face of the LCD display by prying up the corner of the cove r and pulling it off the displa y . 6. If it is necessa ry to clean the front of the LCD display , wipe gently across the surfa ce usin[...]

Remove and Replace 6- 1 0 WFM90D and WFM91D Service Manual New display Figure 6 - 3: LCD Display assembly feet[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 1 1 Instruc tions for ser ial numbers be low B020100. This proce dure tells how to remove and re place a n LC D Display a ssembly (for example , to gain access to another module ). However , if you need to replac e the LCD Display assembly with a new one, please order the LCD Display Assembly [...]

Remove and Replace 6- 1 2 WFM90D and WFM91D Service Manual Open slide latch connector to install cable. Close latch connector Contacts Contacts Figu r e 6 - 4: Inst allin g th e LCD d isp lay cab le 2. If you a re re placing the r ibbon cable, set the LCD display just above its resting position on the locating fee t. Use your finger to cre ase the [...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 1 3 Level the pad flush with display case. LCD locator feet (4) Long pad Short pad Standof f post inserts into LCD display case. Figu r e 6 - 5: Inst allin g th e LCD d isp lay 4. Connect the backlight wire s to the connector s on the side of the display module. 5. If nec essary , clean the fr[...]

Remove and Replace 6- 1 4 WFM90D and WFM91D Service Manual T o repla ce a f aulty backlight f or instruments with se rial number s B 020100 and above, you must install a new LCD display asse mbly . However , the backlight is separ ately repl aceable in instruments with ser ial numbers be low B020100. Remove. T o remove the backlight ( below B020100[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 1 5 T op Board Assem bly The T op board asse mbly contains re pl aceab le s ubparts. Remove. T o remove the T op board: 1. Remove the top cover . R ef er to T o p Co ver on page 6 - - 5. 2. Remove the two retaining scr ews from the top of the T op board. 3. Gently pull on the bottom of T op bo[...]

Remove and Replace 6- 1 6 WFM90D and WFM91D Service Manual Remove. T o remove the keypa d: 1. Remove the top cover . R ef er to T o p Co ver on page 6 - - 5. 2. Remove the T op board. R ef er to T op Boar d on page 6 - - 15. 3. Gently pull the ke ypad from the T op board. Replace. T o replac e the keypad: 1. Press the nubs on the keypad thr ough th[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 1 7 Remove. T o remove the T op board shield: 1. Remove the top cover . R ef er to T o p Co ver on page 6 - - 5. 2. Remove the two retaining scr ews from the top of the T op board. 3. Slide the T op board shield out from under the T op board. Replace. T o replac e the T op board shie ld: 1. If[...]

Remove and Replace 6- 1 8 WFM90D and WFM91D Service Manual Lift up t he board to slip the shield underneath the t op board. Shield Fold t ab The shield tab goes on top of t he board post and under the circuit board. Figu r e 6 - 7: Inst allin g th e T o p boa rd s hie ld[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 1 9 Remove. T o remove the Bottom board: 1. Remove the top cover . R ef er to T o p Co ver on page 6 - - 5. 2. Remove the LCD display assembly . R ef er to LC D Display on page 6- - 7. 3. Remove the T op board. R ef er to T op Boar d on page 6 - - 15. 4. Remove the batter y cover . Refer to Ba[...]

Remove and Replace 6- 2 0 WFM90D and WFM91D Service Manual Align the Input board (and the Backlight board, if present) int o the slots of the bottom cover Input board assembly Figu r e 6 - 8: Inst allin g th e Bot t om b oa rd[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 2 1 T o remove the SDI Int erface board : 1. Remove the top cover . R ef er to T o p Co ver on page 6 - - 5. 2. Remove the batter y cover . Refer to Batte ry C ove r on page 6- - 25. 3. Lift on the Bottom boar d while pressing on the batter y connector in the batter y compartme nt. 4. Disconne[...]

Remove and Replace 6- 2 2 WFM90D and WFM91D Service Manual The following pr ocedure tells you how to re move the Backlight boa rd and reinsta ll the same board (for e xample, to gain acces s to a nother asse mbly). T o repla ce the Backlight board, you must replace the LCD Display asse mbly; contac t your T ektronix re presenta tive to order the re[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 2 3 Backlight board Figure 6 - 10: Rem oving the Backli ght boar d[...]

Remove and Replace 6- 2 4 WFM90D and WFM91D Service Manual Remove. T o remove the Input boar d: 1. Remove the top cover . R ef er to T o p Co ver on page 6 - - 5. 2. Remove the batter y cover . Refer to Batte ry C ove r on page 6- - 25. 3. Lift on the Bottom boar d while you press on the batter y connector in the batter y compartme nt. 4. Gently pu[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 2 5 Bat ter y Cover Assembl y The batter y cover assembly conta ins repl aceable s ubpar ts. Procedur es for removing the subpar ts are included. Remove. T o remove the batte ry cover asse mbly: 1. T urn the tur nlock stud 1/4-turn c ountercloc kwise. 2. Pull outwards on the upper portion of t[...]

Remove and Replace 6- 2 6 WFM90D and WFM91D Service Manual Battery cover Figu r e 6 - 1 1 : Ins t alling t he b at t er y cov er Remove. T o remove the turnlock stud a nd bushing: 1. Remove the batter y cover . Refer to Batte ry C ove r on page 6- - 25. 2. Gently pry up on the outside portion of the bushing as shown in Figure 6- - 12. 3. Gently pul[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 2 7 Bushing Bushing Turn lo ck Battery cover Figure 6 - 12: Rem oval and replacement of t he turnlock stud Replace. T o replac e the turnloc k stud and bushing: 1. Press the tur nlock stud into the bushing. 2. T o install the tur nlock stud and bushing into the ba ttery cove r , press fir mly [...]

Remove and Replace 6- 2 8 WFM90D and WFM91D Service Manual Remove. T o remove the batter y cushion pad: 1. Remove the batter y cover . Refer to Batte ry C ove r on page 6- - 25. 2. T o remove the cushion pa d, pry it up ar ound the edges a nd pull it off of the batter y cover . 3. If nec essary , clean the surf ace of the cushion pad to remove a ny[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 2 9 Press Grasp wire Figure 6 - 13: Rem oving the NiM H bat tery pack Remove. T o remove the C-size a lkaline batter ies: 1. Remove the batter y cover . Refer to Batte ry C ove r on page 6- - 25. 2. Caref ully pull the batterie s out of the battery compa rtment. Replace. T o replac e the C -si[...]

Remove and Replace 6- 3 0 WFM90D and WFM91D Service Manual 2. Install the batte ry cover . R ef er to Battery Cover on page 6- - 25. Figure 6 - 14: Installed polarity of alkali ne batt eries[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 3 1 Bot tom Cover Assembl y The bottom cover asse mbly contains repl aceable s ubparts. Procedur es for removing a nd installing the subpar ts are inc luded below . Remove. T o remove the bottom cover : 1. Remove any installed batte ries. Refer to Batterie s on page 6- - 28. 2. Remove the six [...]

Remove and Replace 6- 3 2 WFM90D and WFM91D Service Manual Replace. T o replac e the battery power c onnector: 1. Solder the batter y power connector wir es to the battery conta cts. S ee Figure 6- - 16. 2. Install the bottom cover . R efe r to Bottom C ove r on page 6 - - 31. Remove. T o remove the batter y contacts: 1. Remove the bottom cover . R[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 3 3 Replace. T o replac e the batte ry contac ts: 1. Align the slot in the ba ttery conta ct with the batte ry contac t alignment ridge on the bottom cover . See Figure 6 - - 15. 2. Push the battery contac t through the slot in the bottom cover until the batter y contac t snaps past the retain[...]

Remove and Replace 6- 3 4 WFM90D and WFM91D Service Manual Remove. T o remove the turnlock stud r ecep tacle: 1. Remove the bottom cover . R ef er to Bottom C ove r on page 6 - - 31. 2. Depre ss the reta ining fingers on the turnlock stud r ece ptacle a nd push the rec eptacle thr ough the bottom cover . S ee Figure 6- - 16. Remove. T o replac e th[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 3 5 Remove. T o remove the batte ry orientation mar ker and/or the batte ry cushion pad: 1. Remove the batter y cover . Refer to Batte ry C ove r on page 6- - 25. 2. T o only remove the batte ry orienta tion marker , pry it up around the edges and pee l it off of the ba ttery cushion pa d on t[...]

Remove and Replace 6- 3 6 WFM90D and WFM91D Service Manual Battery orient ation mark er Battery cushion pad Line up holes to aid positioning Figure 6 - 17: Bat tery or ientation marker position[...]

Remove and Replace WFM90D and WFM91D Servic e Manual 6- 3 7 Remove. T o remove the AC adapter EMI suppr essor: 1. Release the r etaining latch es on the side of the EMI suppressor . 2. Pull the AC adapte r cord from the EMI suppre ssor . Replace. T o replac e the AC adapte r EMI suppressor: 1. Place the EMI suppre ssor within 12 inches of the end o[...]

Remove and Replace 6- 3 8 WFM90D and WFM91D Service Manual[...]

WFM90D and WFM91D Servic e Manual 6- 3 9 T roubleshooting Pr ocedures This section c ontains the following inf ormation to help you loc ate proble ms within the WFM90D or WFM91D: H List of equipme nt require d to perf orm the proc edures H Battery- fault ana lysis H Low-voltage powe r supply H Fault symptom table H T roubleshooting f lowcharts H Co[...]

T roubleshooting Proc edures 6- 4 0 WFM90D and WFM91D Service Manual Bat ter y - Fault Anal ysis NOTE . If the instrument functions pr operly when pow er ed by the AC adapter , but ther e ar e battery or battery char ging pr oblems, use the follow ing pr ocedur e. If ther e ar e no battery pr oblems or if the instrument does not function prope rly [...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 4 1 6. Check for a voltage r eading of +2 VDC on the voltmeter with theWFM90D or WFM91D turned on, and a rea ding of +8 to +9 VDC with the instrument turned of f. The voltage will slowly r ise when the instr ument is turned of f. 7. If the voltage r eading in the previous step was co[...]

T roubleshooting Proc edures 6- 4 2 WFM90D and WFM91D Service Manual Low - V olt age Power Suppl y Use the following proce dure to check that the low-volta ge power supplies are opera ting properly be fore pr ocee ding to Fault Symptom T able . 1. Disconnec t the AC adapte r from the WFM90D or WFM91D. 2. Remove any insta lled batter ies. See Batter[...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 4 3 Fault Sym ptom T able NOTE . Check the low-voltage power supplies (see Low-V oltage Power Supply on page 6- - 42) befor e pr o cee ding w ith the following pr oce dur e: 1. Disconnec t the AC adapte r from the instrument. 2. Remove any insta lled batter ies. See Batterie s on pag[...]

T roubleshooting Proc edures 6- 4 4 WFM90D and WFM91D Service Manual T able 6 - 5: Fault sym ptom t able (Cont.) Symptom Flowchart Dim or bl otchy di splay page 6 - - 58 All di splay m odes are bad except Picture, when no m enus are displayed page 6 - - 58 T roubl eshooti ng Flow chart s The trouble shooting flowchar ts help you isolate the faulty [...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 4 5 Is the Backlight brok en? (The Dis play m odule will have a rat tle inside.) Press t he front panel ON butt on and then the PI X mode butt on. Is the Backlight on? (Look in the end of the Dis play m odule where the high voltage is attac hed.) Replace t he T op board. Replace t he[...]

T roubleshooting Proc edures 6- 4 6 WFM90D and WFM91D Service Manual Are the deflect ion signals OK? Are th e size voltages OK? Is the VIDE O IN signal OK? Remov e the D isplay m odule. (For ins trument s with s erial numbers below BO20100, remov e the Dis play m odule and Backlight board.) Power up the ins trum ent and selec t DEFAUL T PRESETs fro[...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 4 7 Use t his proc edure when the gratic ule is ok , but there is no Vector dis play . Remov e the D isplay m odule. (For ins trument s w ith serial numbers below BO20100, rem ove the D isplay module and Back light board. ) Power up the instrum ent and select D EFAUL T PRESET s f rom[...]

T roubleshooting Proc edures 6- 4 8 WFM90D and WFM91D Service Manual Check J 1 on the SDI In terfac e board: Are MOSI (J 1-5) and SCLK (J 1-6) present? Check SDI I nterf ace board: J 1-1 1 goes from approx imat ely 5 V wit h DIGI T AL select ed to approx imately 0 V wit h ANALOG selec ted? Check the SDI In terfac e board: J1-15 is analog video s ig[...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 4 9 Use t his proc edure when the gr aticul e is ok, but the Audio display is distort ed or not vis ible. Remov e the D isplay m odule. (For ins trument s w ith serial numbers below BO20100, rem ove the D isplay module and Back light board. ) Power up the instrum ent and select D EFA[...]

T roubleshooting Proc edures 6- 5 0 WFM90D and WFM91D Service Manual Replace t he T op board. Replace t he Bottom board. Are the Displ ay dri ve signals OK? Check the D isplay drive s ignals: (Probe J16 from t he back of the Bot tom board.) J16-6 = (B) 2 VDC , 2. 5 V peak video J16-7 = (G) 2 VDC , 2. 5 V peak video J16-8 = (R) 2 VD C, 2.5 V peak vi[...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 5 1 Use t his proc edure when the grat icule and menu are bad, but the PI X mode is ok (moderat e to s evere vert ical flut ter). No Ye s Perform t he Ras ter VCO adjustm ent, if pos sible, in the Adjust ment procedures . Check the R ast er VCO cont rol signal: (J9 is on t he T op bo[...]

T roubleshooting Proc edures 6- 5 2 WFM90D and WFM91D Service Manual Replace t he Bottom board. Are all of thes e signals corr ect? Replace t he Display m odule. Use t his proc edure when the display is all white. Remov e the D isplay m odule. (For ins trument s w ith serial num bers below BO20100, rem ove t he Display module and Bac klight board. [...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 5 3 Are the sync pulses OK? Replace t he T op board. Check for v ertic al and horizontal s ync puls es: (J9 is on T op Board.) J9-18 = TT L level V-rate sync loc ked to t he input signal. J9-19 = TT L level H -rate sy nc lock ed to the input signal. Remov e the D isplay m odule. (For[...]

T roubleshooting Proc edures 6- 5 4 WFM90D and WFM91D Service Manual Use t his proc edure when the Vector display is unlocked. Remov e the D isplay m odule. (For ins trument s w ith serial numbers below BO20100, rem ove t he Display module and Backlight board.) C onnect the AC Adapter and pow er up the instrum ent. Select IN T REF using t he CONF I[...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 5 5 Use t his proc edure when there is Vector display jitter. This problem can be c aused by either t he T op or Bottom boards, and c an only be determ ined by replacing thes e boards one at a tim e. Figure 6 - 30: Flowchart f or vector display ji t ter Replace t he T op board. Use t[...]

T roubleshooting Proc edures 6- 5 6 WFM90D and WFM91D Service Manual Use t his proc edure when there is an ins trum ent control problem . Ye s Replace t he T op Board f irst . Thes e problems can be caus ed by eit her the T op or Bot tom boards, and c an only be det ermined by replacing thes e boards one at a tim e. Do menu select ions change as th[...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 5 7 Use t his proc edure when the m enus are horizontally unlock ed (tearing) in the Pict ure display mode. Ye s No Check the horiz ontal and v ertical s ync signals on t he Bott om board: (J9 is on T op board.) J9-18 = VSYNC is a TT L Level (lock ed to Video IN V-sync ) J9-19 = HSYN[...]

T roubleshooting Proc edures 6- 5 8 WFM90D and WFM91D Service Manual Use t his proc edure when the display is dim or blotchy. Replace t he Dis play module. (For ins trument s with s erial numbers below BO20100, replace the Back light in t he Display module. ) Figure 6 - 34: Flowchart f or dim or blotchy display Use t his proc edure when all of the [...]

T roubleshooting Proc edures WFM90D and WFM91D Servic e Manual 6- 5 9 Connect or Diagr am Figure 6- - 36 illustrates the conne ctor and pin locations of the circ uit board connec tors listed in the tr oubleshooting flowcha rts. J15 J14 J20 Bottom board T op board J16 J9 J16 as seen from t he back of the Bottom board J9 as seen from t he front of th[...]

T roubleshooting Proc edures 6- 6 0 WFM90D and WFM91D Service Manual[...]

Opti ons[...]

[...]

WFM90D and WFM91D Servic e Manual 7- 1 Options This section lists the options and acce ssor ies for the WFM90D and WFM91D .Y o u can orde r options and acce ssories with the monitor or purchase the m separa tely through a T ektronix fie ld off ice or distributor . When order ing, include the option or part number a nd the description. Opt ions Y ou[...]

Options 7- 2 WFM90D and W FM91D S ervic e Manual Accessori es St and ard acce ssorie s are shippe d with every instr ument. The standar d acce ssories for the WFM90D and WFM91D and the T ektronix par t numbers to use whe n order ing are liste d in T able 7- - 2. T able 7 - 2: Standar d accessor ies Description Quantity T ektronix part number WFM90D[...]

Replaceabl e Mechanical Part s[...]

[...]

WFM90D and WFM91D Servic e Manual 8- 1 Replaceable Par ts List This section lists the repl aceab le m odules for this instr ument. Use this list to identify a nd order r epl acement p arts . Part s Or deri ng Inf orm ati on Rep lacem ent p arts are av ail able t hr ough your loca l T ektronix, Inc., Field Of fice or repr esentative . Changes to T e[...]

Rep laceab le P arts List 8- 2 WFM90D and W FM91D S ervic e Manual Using the Repl aceable Par ts Li st This section contains a list of the mecha nical and/or ele ctric al components that are replaceab le fo r the WFM90D and W FM91D . Use this list to identify and or der replacem ent p arts . T he f ollowing table descr ibes each c olumn in the part[...]

Rep laceab le P arts List WFM90D and WFM91D Servic e Manual 8- 3 Manufacturer s Cross Index Mfr . Code Manufacturer Addr ess Ci ty , Sta te, Zi p Cod e 0DWW6 MICRO PO WER ELECTRO NICS 7973 SW C I RRUS DRIVE, BLDG 2 2 BEA VERTON , OR 97008 0GV 90 GLOB TEK INC 18 6 VETE RANS DRIVE NORTHV ALE, NJ 07647 - - 2303 0KB01 ST AUF FER SUPPL Y C O 810 SE SHER[...]

Rep laceab le P arts List 8- 4 WFM90D and W FM91D S ervic e Manual 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Figure 8 - 1: Exploded view (serial numbers B020100 and above)[...]

Rep laceab le P arts List WFM90D and WFM91D Servic e Manual 8- 5 Replaceable Parts List for ser ial numbers B020100 and above Fig. & Inde x Number T ektron ix Part Number Serial No. Effective Serial No. Di scont’ d Qty Name & Description Mf r . Code Mfr . Part Nu mber 8- - 1 - - 1 202- - 0394 - - 00 1 C ASE,T OP:POL YCAR BONA TE, WFM 90D [...]

Rep laceab le P arts List 8- 6 WFM90D and W FM91D S ervic e Manual Replaceable Parts List for ser ial numbers B020100 and above (Cont.) Fig. & Inde x Number Mfr . Part Nu mber Mf r . Code Name & Description Qty Serial No. Di scont’ d Serial No. Effective T ektron ix Part Number 8- - 1 - - 31 214 - - 4628 - - 01 5 SP RING,CONT ACT :BA TTER[...]

Rep laceab le P arts List WFM90D and WFM91D Servic e Manual 8- 7 A5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Figure 8 - 2: Exploded view (ser ial numbers below B020100)[...]

Rep laceab le P arts List 8- 8 WFM90D and W FM91D S ervic e Manual Replaceable Parts List for ser ial numbers below B020100 Fig. & Inde x Number T ektron ix Part Number Serial No. Effective Serial No. Di scont’ d Qty Name & Description Mf r . Code Mfr . Part Nu mber 8- - 2 - - 1 202- - 0394 - - 00 1 C ASE,T OP:POL YCAR BONA TE, WFM 90D 80[...]

Rep laceab le P arts List WFM90D and WFM91D Servic e Manual 8- 9 Replaceable Parts List for ser ial numbers below B020100 (Cont.) Fig. & Inde x Number Mfr . Part Nu mber Mf r . Code Name & Description Qty Serial No. Di scont’ d Serial No. Effective T ektron ix Part Number 8- - 2 - - 28 334-8830-00 1 MARKE R,IDENT :BA TTERY ,0.00 2 MA TTE [...]

Rep laceab le P arts List 8- 1 0 WFM90D and WFM91D Service Manual Replaceable Parts List for ser ial numbers below B020100 (Cont.) Fig. & Inde x Number Mfr . Part Nu mber Mf r . Code Name & Description Qty Serial No. Di scont’ d Serial No. Effective T ektron ix Part Number 1 19- - 4541 - - 02 1 POW ER SUPPL Y ; WALL MOUNT ;12W,240VAC 50HZ[...]

Diagr ams[...]

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WFM90D and WFM91D Servic e Manual 9- 1 Diagr ams The interc onnect diagra m, F igure 9- - 1, shows the jumpers and conne ctors for the WFM90D and WFM91D Handhe ld W avef orm, V ector , P ictur e, and Audio Monitor . (Figure 9- - 2 shows the interconne ct diagram for instr uments with serial numbers be low B020100. ) A3 Bottom Board 10 A1 Input Boar[...]

Diagra ms 9- 2 WFM90D and W FM91D S ervic e Manual A3 Bottom Board 10 A1 Input Board 60 10 J9 J2 J20 J19 J5 A2 T op Board 12 20 J16 A5 LCD Display Module Video I n J3 Ref In J2 Video Out J1 Audio In J4 J14 10 J6 J15 A4 Backlight Board W4 W3 W2 W1 J13 J10 J21 J17 DC in 1 1 - - 18V T est only Backlight J25 NiCad Battery Pack 6 C Cell Batte ries J7 20[...]