Manuale d’uso / di manutenzione del prodotto 071-1143-01 del fabbricante Tektronix
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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 .
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.
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.
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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 ..................................................
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 .
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 ................
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 .
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 ..........................
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 .
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.
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.
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.
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.
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 .
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.
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) .
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.
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.
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 .
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.
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.
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.
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 .
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).
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 in.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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).
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.
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.
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.
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 adju.
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.
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 .
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 ari.
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.
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).
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 .
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.
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 Hor.
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 p.
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.
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 ° .
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.
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.
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.
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.
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).
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.
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).
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 ° .
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.
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.
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.
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 .
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).
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 .
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.
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.
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.
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.
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 .
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.
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 .
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.
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.
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.
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 .
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.
Adjustment Proce dures: Digital Sec tion 5- 1 4 WFM90D and WFM91D Service Manual.
Maint enance.
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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.
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.
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 .
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.
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 .
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.
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 .
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 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.
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 ).
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.
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.
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 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.
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.
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.
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.
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.
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 all.
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.
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).
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.
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.
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.
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.
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 .
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.
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 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 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 .
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 .
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 .
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.
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 .
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.
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.
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.
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.
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 ex.
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.
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.
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.
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 a.
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.
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.
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 .
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.
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.
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.
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.
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.
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.
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.
T roubleshooting Proc edures 6- 6 0 WFM90D and WFM91D Service Manual.
Opti ons.
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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 .
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.
Replaceabl e Mechanical Part s.
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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.
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 .
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.
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.
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 .
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.
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 .
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 .
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.
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 .
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.
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 J.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Tektronix 071-1143-01 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Tektronix 071-1143-01 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Tektronix 071-1143-01 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Tektronix 071-1143-01 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Tektronix 071-1143-01, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Tektronix 071-1143-01.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Tektronix 071-1143-01. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Tektronix 071-1143-01 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.