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Theory of Operation

3- 2

WFM90D and WFM91D Service Manual

Top Board

The Top board contains the microprocessor circuitry, the rasterizer and graphics
generator, the subcarrier oscillator, and the timing generator.

Microprocessor.

The microprocessor takes input from the front-panel keypad to

control the operation of the instrument through the serial bus, parallel bus, and
dedicated control lines.

Rasterizer and Graphics.

The rasterizer and graphics block produces all internally

generated video including waveforms, graticules, and menus. The rasterizer uses
the horizontal and vertical deflection signals to produce the waveforms. The
rasterizer uses the horizontal and vertical sync signals from the Bottom board to
lock to the incoming video signal.

The rasterizer needs a good analog timing voltage to run correctly. This timing
voltage is generated by a circuit loop between the Top and Bottom boards.
Problems with this circuit can be on either circuit board.

Bottom Board

The Bottom board contains the power supply circuitry, the horizontal and
vertical deflection circuits, the NTSC or PAL decoder, the vectorscope and
burst-lock circuitry, the sync separator, and the audio amplifier for the headphone
output.

Backlight Power Supply Board

The Backlight Power Supply board uses the switched DC input voltage from the
batteries or external DC input to generate the voltage for the display backlight.
The backlight mounts into the display module.

LCD Display and Backlight

The LCD Display module generates the display graphics using input signals
generated on the Top and Bottom boards. The power for the LCD Display
module comes from the Bottom board, while the power for the backlight comes
from the Backlight Power Supply board. The display backlight mounts into the
side of the LCD Display module.

Содержание WFM90D

Страница 1: ...This document applies to firmware version 2 13 and above Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are...

Страница 2: ...and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 50...

Страница 3: ...tions This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this...

Страница 4: ......

Страница 5: ...Information Installation 2 1 Mechanical Installation 2 1 Electrical Installation 2 4 Functional Overview 2 7 Keypad Controls 2 7 Side Panel Connectors and Switches 2 10 Onscreen Readouts 2 12 Using t...

Страница 6: ...ment Required 5 2 Adjustment Procedures 5 3 Adjustment Procedures Analog Section 5 5 Raster VCO 5 5 Sweep Timing and Horizontal Mag Registration 5 5 Vertical Gain and X5 Gain Registration 5 7 Frequenc...

Страница 7: ...and WFM91D Service Manual iii Options Options 7 1 Options 7 1 Accessories 7 2 Replaceable Mechanical Parts Replaceable Parts List 8 1 Parts Ordering Information 8 1 Using the Replaceable Parts List 8...

Страница 8: ...1 3 dB marks on the vector graticule 4 12 Figure 5 1 NTSC graticule showing the vector gain adjustment 5 10 Figure 6 1 Removing the top cover 6 5 Figure 6 2 Installing the LCD display cable 6 7 Figure...

Страница 9: ...raticules and menus 6 43 Figure 6 24 Flowchart for all white display 6 44 Figure 6 25 Flowchart for untriggered waveform display 6 45 Figure 6 26 Flowchart for unlocked vector display 6 46 Figure 6 27...

Страница 10: ...able 2 4 Audio menu choices 2 19 Table 2 5 Picture menu choices analog and digital 2 19 Table 2 6 WIP menu choices analog and digital 2 20 Table 2 7 Configure menu choices 2 23 Table 2 8 Default instr...

Страница 11: ...nual for further ratings information before making connections to the product Replace Batteries Properly Replace batteries only with the proper type and rating specified Recharge Batteries Properly Re...

Страница 12: ...GER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to proper...

Страница 13: ...one Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present Use Care When Servicing With Power On Dangerous vol...

Страница 14: ...Service Safety Summary x WFM90D and WFM91D Service Manual...

Страница 15: ...ption based on block diagrams of the instrument circuitry H Performance Verification provides procedures for verifying instrument performance H Adjustment Procedures provides procedures for adjusting...

Страница 16: ...Sales support 1 800 833 9200 select option 1 Service support 1 800 833 9200 select option 2 Technical support Email techsupport tektronix com 1 800 833 9200 select option 3 6 00 a m 5 00 p m Pacific...

Страница 17: ...Specifications...

Страница 18: ......

Страница 19: ...in non traditional applications such as field production and system maintenance H Accepts NTSC PAL composite video or 525 625 Component 270 Mbit serial digital video signals H Automatic detection of a...

Страница 20: ...ion that amplifies a performance requirement or is of special importance is indicated by REF There is no need to check these items to a specific tolerance Electrical Specifications Table 1 1 Vertical...

Страница 21: ...between 0 8 V and 2 V can be adjusted to 140 IRE 1 0 V display 160 mV to 400 mV for X5 Gain REQ Position Range 1 V signal can be positioned so that peak white and sync tip can be placed at blanking le...

Страница 22: ...n Video Input Return Loss REF 40 dB from 50 kHz to 6 MHz 15 dB from 6 MHz to 270 MHz REF With 75 termination on Video Out Return Loss 75 REF 30 dB from 50 kHz to 6 MHz Video Out Differential Gain 50 A...

Страница 23: ...ate REQ Equal to line rate of applied video or external sync 2LINE Sweep Repetition Rate REQ Equal to half line rate of applied video or external sync 2FLD Sweep Repetition Rate REF Displays 2 full fi...

Страница 24: ...ential Gain REF 1 Analog input only REF Measured with 140 IRE 1 V linearity signal 5 step 10 step or Ramp with 40 IRE 300 mV of subcarrier Subcarrier Regenerator Pull In Range REQ NTSC 50 Hz of FSC PA...

Страница 25: ...MHz With 75 termination on instrument power on REF Absolute Maximum Input Voltage 12 VDC plus peak AC Table 1 7 Power source Category Description Battery REF 6 C cell batteries or Tektronix NiMH batt...

Страница 26: ...e REQ To 9 842 feet 3000 meters Operating Temperature REQ 0 C to 40 C Vibration Operating REF 15 minutes each axis at 0 015 inch frequency varied from 10 55 10 Hz in 1 minute cycles with instrument se...

Страница 27: ...unity IEC 61000 4 5 Power line surge immunity IEC 61000 4 6 Conducted RF Immunity IEC 61000 4 11 Voltage dips and interruptions immunity EN 55103 2 Annex A Radiated magnetic field immunity EN 55103 2...

Страница 28: ...enerally encapsulated hermetically sealed or located in clean rooms Pollution Degree 2 Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity that is caused by condensa...

Страница 29: ...Operating Information...

Страница 30: ......

Страница 31: ...y shipped cabinet installed To guarantee compliance with specifications only operate the instrument in its cabinet Save the shipping carton and packing materials including antistatic bag in case it be...

Страница 32: ...al Figure 2 1 Installing the viewing hood The desk stand holds the monitor upright on a flat surface Insert the prongs of the stand into the holes in the back of the instrument as shown in Figure 2 2...

Страница 33: ...generator The travel case compartments see Figure 2 3 hold the following items 1 Signal cables and user manuals for the monitor and generator 2 Handheld monitor viewing hood slipped around the monitor...

Страница 34: ...fe trickle charge mode which can run indefinitely The message LOW BAT is displayed onscreen when the remaining battery power cannot guarantee reliable instrument operation After this message appears t...

Страница 35: ...ttery life may be limited NOTE Always replace all of the alkaline batteries at the same time The polarity of the alkaline batteries must be correct for the instrument to operate The battery compartmen...

Страница 36: ...Installation 2 6 WFM90D and WFM91D Service Manual Figure 2 5 Inside of the battery compartment showing polarity markings...

Страница 37: ...uration is not saved if the power source is removed before you turn off the instrument with this button WFM Pressing the WFM button enters the Waveform display mode VECT Pressing the VECT button enter...

Страница 38: ...Functional Overview 2 8 WFM90D and WFM91D Service Manual WFM90D Press and hold for two seconds to open the digital menu for the selected operating mode Figure 2 6 WFM90D keypad...

Страница 39: ...ections which control overall instru ment monitoring operation Configuration menu selections are described in detail in Configuration Menu starting on page 2 21 LINE SEL Pressing the LINE SEL button t...

Страница 40: ...erminated 75 compensated for a video signal A rear panel switch provides an internal 75 signal termination NOTE A loop through connector can be used by connecting a BNC T connector to the Video In BNC...

Страница 41: ...e damage to the instrument circuitry when using a DC power source other than the supplied AC adapter ensure that the DC source is a negative ground 11 18 V system with a negative center lead The DC so...

Страница 42: ...mponent is selected for display through the digital Waveform menu COMPOSITE GREEN BLUE RED Y Pb Pr C The readout only appears if digital video is locked or if INPUT CTL is set to DIGITAL 3 The EXT REF...

Страница 43: ...instrument software version number is displayed when the Configura tion menu is open with the DISPLAY category selected 10 The GAIN UNCAL message appears in the Waveform Vector and Waveform in Pictur...

Страница 44: ...Functional Overview 2 14 WFM90D and WFM91D Service Manual...

Страница 45: ...e Configuration menu Some menu selections appear only in one or the other model or only in digital mode These special considerations are noted in the following illustrations and tables WFM MENU Hold M...

Страница 46: ...only TITLE OFF ON WFM90D only SAFE AREA OFF ON WFM91D only V SHIFT OFF ON REFERENCE dBm MIC 10 0 4 8 HEADROOM 3 dB 10 dB ANALOG DIGITAL EDH RPRT OFF ON CLR WTCH OFF ON ANALOG DIGITAL EDH RPRT OFF ON C...

Страница 47: ...ng menu first ensure that the input control is configured for AUTO or DIGITAL see Configuration Menu on page 2 21 Then select the desired operating mode Waveform Vector Picture or WIP and hold the MEN...

Страница 48: ...es or disables the EDH reporting readout at the top center of the display in Waveform and Vector modes CRC WTCH n Enables or disables the CRC reporting readout on the right side of the display in Wave...

Страница 49: ...e MENU button in for two seconds to open the digital menu For more details on menu access see page 2 17 Picture menu choices are shown in Table 2 5 The Picture menu tree is shown in Figure 2 10 Table...

Страница 50: ...Digital Only Function WFM Selects the Waveform mode for display in the WIP window VECT Selects the Vector mode for display in the WIP window AUDIO Selects the Audio mode for display in the WIP window...

Страница 51: ...splayed immediately Configuration menu categories are displayed above the left bezel button The selected category is highlighted To scroll through the menu categories press the left bezel button or pr...

Страница 52: ...ust be in PIX mode to adjust VIEW VIEW ADJUST BRIGHT BRIGHT ADJUST TRACE TRACE ADJUST GRAT GRAT ADJUST DC REST SLOW FAST REF INT EXT VARGAIN ON OFF BARS 75 100 SETUP NO YES HUE HUE ADJUST COLOR COLOR...

Страница 53: ...buttons adjust the signal gain the instrument must be in Waveform or Vector display mode The first time you press one of the right two bezel buttons the category list disappears from the left side of...

Страница 54: ...r phase and picture hue are also reset The default settings of the keypad and menus are listed in Table 2 8 CABLE RPT Turns the cable report off and on When cable report is turned on the readout displ...

Страница 55: ...X1 Variable gain Off Sweep 2H 2 Line Mag Off Bars 75 Setup WFM90D only Yes Alt Phase WFM91D only Off Reference dBu 0 dBu Headroom 3 dB WIP location Bottom right Alarms Off Safe action Off Safe title O...

Страница 56: ...The Line Select menu is shown in Figure 2 11 on page 2 16 and the Line Select menu choices are shown in Table 2 9 Table 2 9 Line Select menu choices Selection Function FIELDS ALL Selects all video fie...

Страница 57: ...Theory of Operation...

Страница 58: ......

Страница 59: ...om board The video output signal from the Bottom board is routed through the Input board The audio variable gain is controlled by the microprocessor serial bus which is routed to the Input board from...

Страница 60: ...to run correctly This timing voltage is generated by a circuit loop between the Top and Bottom boards Problems with this circuit can be on either circuit board Bottom Board The Bottom board contains t...

Страница 61: ...cillator Timing Sel Vid Backlight Brightness RGB Sweep Trig Fuse Fuse Battery Sync Separator Power Supply and Battery Charger 8 VDC 5 VDC Vector 8 VDC 5 VDC Control DAC 16 analog Outputs Audio Headpho...

Страница 62: ...Theory of Operation 3 4 WFM90D and WFM91D Service Manual...

Страница 63: ...Performance Verification...

Страница 64: ......

Страница 65: ...ghout these procedures H Each verification procedure uses the following format Title of verification procedure Specification requirement s the procedure is verifying Verification procedure H When you...

Страница 66: ...for internal reference and sync amplitudes of between 143 mV and 4 V for external reference 4 5 Sweep timing and integral linearity Sweep Timing Accuracy 5 s Div 1 Line 10 s Div 2 Line and 1 0 s Div 2...

Страница 67: ...se specifications An accuracy ratio of 4 1 or better for the warranted specifications will be obtained using the equipment recommended in Table 4 2 with the following exceptions H Audio Amplitude 2 5...

Страница 68: ...coaxial cable Two cables required male to male BNC connectors Tektronix part number 012 0159 00 42 inch 50 coaxial cable 1 precision male to male BNC connectors Tektronix part number 012 0482 00 36 i...

Страница 69: ...t for at least 20 minutes before you perform any of the verification procedures Sync Separation This procedure verifies the following requirement Signal synchronization will occur with input signals o...

Страница 70: ...the multiburst generator frequency to 200 kHz 6 Check for one cycle per division 1 minor division over the center ten graticule divisions 7 Adjust the multiburst generator frequency so that the cycle...

Страница 71: ...nator from the VIDEO IN connector 6 Connect the output of the VAC to the VIDEO IN connector Do not terminate the input 7 Set the VAC for a 999 9 mV output with all of the buttons out except for LUM an...

Страница 72: ...ting the Variable Gain controls that the signal amplitude can be displayed greater than 140 IRE 1000 mV PAL 12 Replace the VAC signal on the VIDEO IN connector with a pulse and bar signal using a 75 i...

Страница 73: ...015 0408 00 Peak to Peak Detector Input 5 Connect the peak to peak detector Output to the digital multimeter or oscilloscope 6 Set the leveled sine wave generator frequency to 50 kHz and adjust the g...

Страница 74: ...that the digital multimeter readout level or the oscilloscope DC level is within 7 mV of the reading noted in step 19 26 Select X1 GAIN from the Operating menu 27 Remove the dual input coupler from th...

Страница 75: ...s changed 50 Hz 10 Hz PAL from nominal that the display locks and that the burst phase has changed 2 or less 5 Return the subcarrier frequency to nominal on the television signal generator 6 Replace t...

Страница 76: ...MHz 4 43 MHz PAL and adjust the amplitude control so that the circle overlays the graticule compass rose 4 Decrease the frequency on the leveled sine wave generator until the edge of the circle displ...

Страница 77: ...ponse This procedure verifies the following requirement Measurement Accuracy 0 5 dB at 1 kHz Frequency Response 0 5 dB from 50 Hz to 20 kHz 1 Connect the output from the audio generator to the AUDIO I...

Страница 78: ...ence level graticule lines 18 Set the audio generator frequency to 5 kHz 19 Check that the display amplitude is within 0 5 dB of the reference level graticule lines 20 Set the audio generator frequenc...

Страница 79: ...of the display changes to show DIGITAL CMPST This indicates that the instrument is receiving the serial digital signal 6 Enter the Configure menu Select PRESETS and then select DEFAULT NOTE While che...

Страница 80: ...approximately 1 4 major division from sync tip to white bar 40 IRE to 100 IRE for 525 or 300 mV to 700 mV for 625 13 Exit the digital waveform menu Check Frequency Response This procedure verifies the...

Страница 81: ...nd exit the menu 4 Set the digital signal generator to output a 100 sweep signal 5 Adjust the position control to view the bottom of the 100 sweep signal 6 Check that the variation in the peak to peak...

Страница 82: ...Performance Verification Digital Section 4 18 WFM90D and WFM91D Service Manual...

Страница 83: ...Adjustment Procedures...

Страница 84: ......

Страница 85: ...he adjustment procedure steps Table 5 1 Summary adjustment Adjustment Page number ANALOG SECTION Preliminary setup 5 5 Raster VCO 5 5 Sweep timing and horizontal mag registration 5 5 Vertical gain and...

Страница 86: ...e 10 Hz to 10 MHz Accuracy 0 001 Tektronix DC 503A1 Universal Counter Video amplitude calibrator VAC Signal Adjustable square wave 0 0 mVpp to 999 9 mVpp Resolution 0 1 mV Accuracy 0 05 Frequency Appr...

Страница 87: ...od of at least 20 minutes NOTE Use only the front panel settings described in the procedure steps If you deviate from these settings you may incorrectly adjust your instrument 1 Press and hold the CON...

Страница 88: ...Adjustments 5 4 WFM90D and WFM91D Service Manual...

Страница 89: ...RAST VCO from the Calibration menu 2 Select CAL and then select AUTO 3 Wait until the CANCEL message disappears from the screen 4 Select CAL MENU and then select SAVE from the menu Sweep Timing and Ho...

Страница 90: ...select CAL 16 Adjust the arrow buttons for one cycle per major division 17 Select CAL MENU and then select SAVE 18 Select MAG OFF from the Operating menu 19 Replace the signal on the VIDEO IN connect...

Страница 91: ...L 9 Adjust the arrow buttons for a display amplitude of exactly 140 IRE 1000 mV PAL 10 Select CAL MENU and then select SAVE 11 Replace the signal on the VIDEO IN connector with a 75 color bar signal f...

Страница 92: ...uency to 3 58 MHz 4 43 MHz PAL 11 Adjust the amplitude of the sine wave generator so that the digital multime ter readout or oscilloscope level matches that noted in step 9 12 Select X1 FREQ from the...

Страница 93: ...r the best center dot overlay 6 Select QUAD PH 7 Adjust the arrow buttons for the best circle overlay 8 Select CAL MENU and then select SAVE 9 WFM91D ONLY Select ALT OFF from the Configuration menu Ve...

Страница 94: ...e line 10 Select CAL MENU and then select SAVE Audio Gain Perform these steps to adjust the audio gain 1 Connect the output from the audio generator to the AUDIO IN connector 2 Set the audio generator...

Страница 95: ...lowing steps to adjust the vertical gain 1 Select DG1 X1 GAIN from the Calibration menu and then select CAL 2 Moving between position control POS and gain adjust DG1 X1 Gain adjust the arrow buttons f...

Страница 96: ...between position control POS and gain adjust DG X5 FREQ adjust the arrow buttons for the flattest bottom on the modulated pulse 7 Select DG CAL MENU and then select SAVE Vector Gain and X5 Gain Phase...

Страница 97: ...81 cable 2 Select CABLE LEN from the Calibration menu and then select CAL Two values are displayed in the upper right corner of the screen cable length calibration CABLE LEN CAL and cable reading NOTE...

Страница 98: ...Adjustment Procedures Digital Section 5 14 WFM90D and WFM91D Service Manual...

Страница 99: ...Maintenance...

Страница 100: ......

Страница 101: ...o not use chemical cleaning agents they may damage the instrument Avoid chemicals that contain benzene toluene xylene acetone or similar solvents Clean the exterior surfaces of the instrument with a d...

Страница 102: ...d phone number of someone at your firm who can be contacted the instrument serial number and a description of the required service 2 Package the instrument in the original packaging materials If the o...

Страница 103: ...ies on page 6 21 Tools Required Use the tools in Table 6 1 to disassemble the instrument to its individual modules Some of these tools are required only for removal of specific instru ment components...

Страница 104: ...Backlight 6 10 Top board 6 11 Keypad 6 11 Top board shield 6 12 Bottom board 6 14 SDI Interface board 6 16 Backlight board 6 17 Input board assembly 6 17 Battery cover 6 18 Carrying strap 6 18 Turnloc...

Страница 105: ...le subparts Procedures for removing the subparts are included below Top Cover To remove the top cover assembly perform the following procedure 1 Remove the six retaining screws using the Torx tip scre...

Страница 106: ...buttons slide through the top cover holes 4 Install the six retaining screws using the Torx tip screwdriver LCD Display Lens To remove the LCD display lens perform the following procedure 1 Remove the...

Страница 107: ...to lift it up off of the locating feet and disconnect the ribbon cable from the back of the display module NOTE The cable connecting the display module to the Bottom board is a zero insertion force r...

Страница 108: ...all the cable into the connector pull out the connector latch and then push the ribbon cable into the connector housing When the cable rests against the back of the connector press in the connector la...

Страница 109: ...t 4 Long pad Short pad Standoff post inserts into LCD display case Figure 6 3 Installing the LCD display LCD Display Padding To remove the LCD display padding perform the following procedure 1 Remove...

Страница 110: ...5 2 Remove the LCD display module Refer to LCD Display on page 6 7 3 Remove the display padding from the side of the LCD display module where the backlight is installed 4 Remove the two outside retai...

Страница 111: ...r to Keypad on page 6 11 2 Gently press on the bottom of the Top board to insert the Top board connector into the Bottom board connector 3 Be sure that the circuit board shield is properly aligned Ref...

Страница 112: ...op Cover on page 6 5 Top Board Shield To remove the Top board shield perform the following procedure 1 Remove the top cover Refer to Top Cover on page 6 5 2 Remove the two retaining screws from the to...

Страница 113: ...he shield under the Top board and align the cutouts in the shield with the mounting posts of the Top board NOTE Be sure to properly align the tab of the Top board shield so that the tab is under the T...

Страница 114: ...rom the back of the Bottom board 7 Gently pull the Input board assembly from the back of the Bottom board To replace the Bottom board perform the following procedure 1 Install the Input board into the...

Страница 115: ...move and Replace WFM90D and WFM91D Service Manual 6 15 Align the Backlight and Input boards into the slots of the bottom cover Backlight board Input board assembly Figure 6 6 Installing the Bottom boa...

Страница 116: ...8 3 Lift on the Bottom board while pressing on the battery connector in the battery compartment 4 Disconnect the 20 pin cable from J7 on the Input board 5 Remove the SDI Interface board from the slot...

Страница 117: ...2 Install the Backlight board into the back of the Bottom board 3 Align the Backlight and Input boards with the slots in the bottom cover and gently slide the boards into the bottom cover 4 Install t...

Страница 118: ...procedure 1 Turn the turnlock stud 1 4 turn counterclockwise 2 Pull outwards on the upper portion of the battery cover To replace the battery cover assembly perform the following procedure 1 Place the...

Страница 119: ...er Turnlock Stud and Bushing To remove the turnlock stud and bushing perform the following procedure 1 Remove the battery cover Refer to Battery Cover on page 6 18 2 Gently pry up on the outside porti...

Страница 120: ...the following procedure 1 Press the turnlock stud into the bushing 2 To install the turnlock stud and bushing into the battery cover press firmly on the turnlock stud head Be sure to keep the bushing...

Страница 121: ...s positioned on the battery cover to make sure the pad is securely in place 3 Install the battery cover Refer to Battery Cover on page 6 18 There are two procedures for replacing the batteries The fir...

Страница 122: ...on page 6 18 2 Carefully pull the batteries out of the battery compartment To replace the C size alkaline batteries perform the following procedure 1 Press the batteries into place according to the po...

Страница 123: ...six Torx screws from the bottom cover 3 Carefully remove the bottom cover and place it beside the top cover CAUTION To prevent damage to the battery power wires soldered to the bottom cover carefully...

Страница 124: ...er to Bottom Cover on page 6 23 2 Unsolder the battery connector wires from the battery contacts To replace the battery power connector perform the following procedure 1 Solder the battery power conne...

Страница 125: ...form the following procedure 1 Align the slot in the battery contact with the battery contact alignment ridge on the bottom cover See Figure 6 12 2 Push the battery contact through the slot in the bot...

Страница 126: ...wire and turnlock stud receptacle installation 4 Install the bottom cover Refer to Bottom Cover on page 6 23 Turnlock Stud Receptacle To remove the turnlock stud receptacle perform the following proce...

Страница 127: ...osition the electrical shield in place above the inside of the bottom cover before you press it onto the bottom cover Be sure to align the hole in the shield with the hole in the bottom cover 3 Rub yo...

Страница 128: ...ective covering of the adhesive surface of the battery cushion pad 2 Position the battery cushion pad in place above the bottom cover before you press it onto the bottom cover See Figure 6 14 3 Rub yo...

Страница 129: ...6 18 To remove the AC adapter EMI suppressor perform the following procedure 1 Release the retaining latches on the side of the EMI suppressor 2 Pull the AC adapter cord from the EMI suppressor To rep...

Страница 130: ...Remove and Replace 6 30 WFM90D and WFM91D Service Manual...

Страница 131: ...d for troubleshooting Equipment Description Minimum Requirements Equipment Example Television test signal generator 75 color bar and 100 flat field test signals for the television standard of the moni...

Страница 132: ...ve the AC adapter from the WFM90D or WFM91D 2 Remove the battery cover and any installed batteries from the instrument See Batteries on page 6 21 3 Use three jumper wires to connect a 30 3 W resistor...

Страница 133: ...the voltage reading in the previous step was correct replace the batteries If the voltage reading was incorrect replace the Bottom board WARNING To prevent electric shock and high voltage arcing do n...

Страница 134: ...isted in Table 6 4 Table 6 4 Low voltage power supplies Supply Test Point Output Ripple 8 V J9 pin 13 40 mV 30 mV 8 V J9 pin 14 40 mV 30 mV 5 V J9 pin 15 25 mV 60 mV 6 If the low voltage power supplie...

Страница 135: ...VIDEO OUT connector to the picture monitor 7 Locate your fault symptom in Table 6 5 and use the indicated flowchart to isolate the faulty module Table 6 5 Fault symptom table Symptom Flowchart No disp...

Страница 136: ...re bad except Picture when no menus are displayed page 6 50 Troubleshooting Flowcharts The troubleshooting flowcharts help you isolate the faulty module Each flowchart is directly related to a fault s...

Страница 137: ...No No Yes Is the VIDEO OUT signal good Is there 400 VAC as measured on the oscilloscope Yes No Are all of the Backlight power supply inputs good Replace the Backlight board Check the Display drive sig...

Страница 138: ...vertical deflection signals J9 is on the back of the Top board J9 1 1 3 Vpp 2 VDC vert J9 3 2 2 Vpp 2 3 VDC horiz Replace the Input board Replace the Bottom board Replace the Bottom board Check the i...

Страница 139: ...Ts from the CONFIGURE menu Select Vector display mode Is the VIDEO IN signal OK No Yes No Yes Go to Figure 6 18 Replace the Bottom board Replace the Top board Are the vector deflection signals OK Chec...

Страница 140: ...al input signal Check CARRIER DETECT LINE SDI Interface board J1 12 approximately 3 4 VDC with no signal and approximately 4 5 VDC with serial digital input signal IN the CONFIG menu set INPUT CTL to...

Страница 141: ...Yes No Yes Replace the Top board Check the AUDIO IN signal J15 is on the Bottom board J15 4 Check for a gain of X1 above input signal level The Audio Amplifier gain is always X1 in 8 dbu The signal l...

Страница 142: ...a display in any other operating mode except WIP Check the SEL_EXVIDEO signal Probe J16 from the back of the Bottom board J16 14 5 VDC in PIX mode Is the SEL_EXVIDEO signal OK Replace the Display mod...

Страница 143: ...ok moderate to severe vertical flutter No Yes Perform the Raster VCO adjustment if possible in the Adjustment procedures Check the Raster VCO control signal J9 is on the Top board J9 6 Approximately 1...

Страница 144: ...s Probe J16 from the back of the Bottom board J16 9 1 to 3 VDC as VIEW is adjusted in the CONFIGURE menu J16 10 DSYNC 0 to 0 6 V compsync J16 14 SEL_EXVID 5 VDC in PIX mode 0 VDC in Waveform mode Sele...

Страница 145: ...cked to the input signal Remove the Display module and Backlight board Connect the AC Adapter and power up the instrument Select INT REF using the CONFIGURE menu No Yes Use this procedure when the Wav...

Страница 146: ...the Subcarrier Regenerator Oscillator SRO control voltage J9 is on the Top board J9 12 approximately 1 VDC Is the SRO control signal a DC voltage No This problem can be caused by either the Top or Bot...

Страница 147: ...op board Use this procedure when the vectors are distorted in the Vector display mode Does this remedy the problem Are the IFsc and QFsc signals OK Perform the following steps in the Adjustment Proced...

Страница 148: ...ge as the front panel buttons are pressed and does the graticule appear ok Do some front panel keys work and some do not Other control problems include The instrument does not respond to front panel k...

Страница 149: ...ls on the Bottom board J9 is on Top board J9 18 VSYNC is a TTL Level locked to Video IN V sync J9 19 HSYNC is a TTL Level locked to VIDEO IN H sync Does the input signal have noisy sync Are the VSYNC...

Страница 150: ...play is dim or blotchy Replace the Backlight in the Display module Figure 6 31 Flowchart for dim or blotchy display Use this procedure when all of the display modes are bad except Picture when no menu...

Страница 151: ...rs listed in the troubleshooting flowcharts J15 J14 J20 Bottom board Top board J16 J9 J16 as seen from the back of the Bottom board J9 as seen from the front of the Top board View of the Top and Botto...

Страница 152: ...Troubleshooting Procedures 6 52 WFM90D and WFM91D Service Manual...

Страница 153: ...Options...

Страница 154: ......

Страница 155: ...ektronix part numbers listed in Table 7 1 Table 7 1 Options Option Description Tektronix part number Option 01 NiMH battery pack 146 0107 01 Option A1 220 V wall unit power adapter European TUV 119 45...

Страница 156: ...90D WFM91D Handheld Waveform Vector Picture Audio Monitor User Manual 1 ea 071 1142 00 120 V wall unit power adapter North American 1 ea 119 4538 01 Carrying pouch 1 ea 116 1330 01 Table 7 3 Optional...

Страница 157: ...Replaceable Mechanical Parts...

Страница 158: ......

Страница 159: ...been replaced with a different or improved part your local Tektronix Inc Field Office or representative will contact you concerning any change in part number Modules can be serviced by selecting one o...

Страница 160: ...at which the part was discontinued No entry indicates the part is good for all serial numbers 5 Qty This indicates the quantity of parts used 6 Name description An item name is separated from the des...

Страница 161: ...TENERS INC 31012 HUNTWOOD AVE HAYWARD CA 94544 55322 SAMTEC INC 810 PROGRESS BLVD PO BOX 1147 NEW ALBANY IN 47150 1147 73743 FISCHER SPECIAL MFG CO 111 INDUSTRIAL RD PO BOX 76500 COLD SPRINGS KY 41076...

Страница 162: ...Parts List 8 4 WFM90D and WFM91D Service Manual A2 A3 A4 A5 A1 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 1 Ex...

Страница 163: ...48 1722 00 8 11 159 0378 00 2 FUSE WIRE LEAD 2 0A 125V 1 SEC MIN 60 SECTROLLED 75915 R473 002 T1R 8 12 213 0774 00 2 SCREW TPG TF M3 0 5 X 10MM L TORX DRIVE BLACK ENDURION 93907 ORDER BY DESCRIPTION 8...

Страница 164: ...TERY CONTACT SINGLE 80009 214 4627 01 8 33 214 4628 01 5 SPRING CONTACT SPRING BATTERY CONTACT DUAL 80009 214 4628 01 8 34 174 3289 00 1 CA ASSY SP DISCRETE CPD 2 24 AWG TEFLON 4 3 L 1X2 0 079 CTR 2MM...

Страница 165: ...0 386 6787 00 1 FLIP STAND METAL 80009 386 6787 00 011 0167 01 1 HOOD PLASTIC 80009 011 0167 01 016 1344 00 1 CARRYING CASE WFM90D OR WFM91D TSG95 80009 016 1344 00 119 4540 00 1 POWER SUPPLY 12W 12V...

Страница 166: ...Replaceable Parts List 8 8 WFM90D and WFM91D Service Manual...

Страница 167: ...Diagrams...

Страница 168: ......

Страница 169: ...ure and Audio Monitor A3 Bottom Board 10 A1 Input Board 60 10 J9 J2 J20 J19 J5 A2 Top Board 12 20 J16 A5 LCD Display Module Video In J3 Ref In J2 Video Out J1 Audio In J4 J14 10 J6 J15 A4 Backlight Bo...

Страница 170: ...Diagrams 9 2 WFM90D and WFM91D Service Manual...

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