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Service Manual

TDS 620A, 640A & 644A
Digitizing Oscilloscope

070-8718-04

Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.

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Summary of Contents for TDS 620A

Page 1: ...Oscilloscope 070 8718 04 Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to all...

Page 2: ...patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Printed in the U S A Tektronix Inc P...

Page 3: ...ations 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 thi...

Page 4: ......

Page 5: ...3 2 1 10 01 2 0 3 01 0 4 15 2 5 4 1 0 1 0 7 2 1 0 1 7 0 1 7 2 0 1 501 7 6 1 501 7 501 7 2 0 1 1 7 7 0 00 01 7 02 1 00 01 7 1 7 0 5 7 10 7 1 1 01 0 7 5 1 01 0 7...

Page 6: ...2 2 1 2 2 2 1 0 1 0 1 0 2 0 1 1 1 2 2 1 2 1 1 0 1 2 1 1 1 2 1 1 2 2 2 1 2 2 1 1 1 1 1 1 2 2 2...

Page 7: ...tage Measurement Accuracy 4 23 Check Analog Bandwidth 4 29 Check Delay Between Channels 4 33 2 3 Check Accuracy for Long Term Sample Rate Delay Time and Delta Time Measurements 4 37 2 3 Check Accuracy...

Page 8: ...7 Compensate the Probe 5 10 Measure Probe Bandwidth 5 12 Adjust the Probe High Frequency Response 5 14 Brightness and Contrast Adjustment TDS 620A and 640A Monochrome Only 5 18 Rotation Brightness and...

Page 9: ...nuator Assembly 6 31 Fan 6 32 A14 D1 Bus and Analog Power and Digital Power Cables 6 33 A23 SerPar Board RS232 Centronics Hardcopy Interface 6 35 A29 Video Trigger Board 6 37 A11 Processor Display Boa...

Page 10: ...vi...

Page 11: ...8 Figure 4 14 Initial Test Hookup 4 40 Figure 4 15 Measurement of Time Accuracy for Pulse and Glitch Triggering 4 42 Figure 4 16 Initial Test Hookup 4 43 Figure 4 17 Measurement of Trigger Level Accur...

Page 12: ...Patches 5 19 Figure 5 12 TDS 644A Five and Ten Percent Luminance Patches 5 22 Figure 6 1 External Modules 6 12 Figure 6 2 Outer Chassis Modules 6 13 Figure 6 3 Inner Chassis Modules TDS 620A or 640A...

Page 13: ...Video Signal with White Black and Blanking Levels Color Display 6 72 Figure 6 37 Monochrome TDS 620A and 640A Display Troubleshooting Procedure 6 73 Figure 6 38 Horizontal and Vertical Sync Signals M...

Page 14: ...x...

Page 15: ...s Time Base System 1 20 Table 1 15 Typical Characteristics Triggering System 1 20 Table 1 16 Typical Characteristics Data Handling and Reliability 1 22 Table 2 1 Power Cord Conductor Identification 2...

Page 16: ...xii...

Page 17: ...xiii H H H H...

Page 18: ...xiv...

Page 19: ...xv...

Page 20: ...xvi...

Page 21: ......

Page 22: ...ser definable format H Acquisition modes such as sample envelope and average H A full complement of advanced functions like continuously updated measurements results and local pass fail decision makin...

Page 23: ...1 2 2 2 0 2 1 0 0 0 2 0 1 0 2 0 main 2 0 side 2 2 0 1 0 0 0 selecting 2 2 adjust 0 0 1 1 2 0 0...

Page 24: ...modes main only main intensified and delayed only You can select among various horizontal record length set tings A feature called Fit to Screen allows you to view entire waveform records within the...

Page 25: ...FlexFormatTM flexible format allows the user to define the video format on which to trigger You can choose where the trigger point is located within the acquired wave form record by selecting the amo...

Page 26: ...multaneously These are delta measurements that is measurements based on the difference between two cursors Both H Bar and V Bar cursors can also be used to make absolute measure ments that is measurem...

Page 27: ...ing and receiving waveforms over the GPIB interface IEEE Std 488 1 1987 IEEE Std 488 2 1987 standard This feature makes the instrument ideal for making automated measurements in a production or resear...

Page 28: ...intensified or non intensi fied samples infinite persistence and variable persistence with color coding H Interpolation method Sin x x or Linear H Display format xy or yt with various graticule selec...

Page 29: ...1 8...

Page 30: ...umber of 8 bits Input Channels Number of Four all identical TDS 640A 644A Two all identical TDS 620A Input Coupling DC AC or GND Input Impedance Selections 1 M or 50 Ranges Offset 21 4 22 1 mV div 99...

Page 31: ...to 250 s Range Events Delay 2 to 10 000 000 Range Time for Pulse Glitch or Pulse Width Triggering 2 ns to 1 s Ranges Trigger Level or Threshold Any Channel Auxiliary Line 12 divisions from center of...

Page 32: ...ing TDS 620A and 640A Sixteen levels in infinite persistence or varia ble persistence display styles 0 1 Interface GPIB GPIB interface complies with IEEE Std 488 1987 Interface RS 232 RS 232 interface...

Page 33: ...g 44 lbs when packaged for domestic shipment Rackmount TDS 644A Digitizing Oscilloscope 13 7 kg 30 lbs plus weight of rackmount parts for the rack mounted Digitizing Oscilloscope Option 1R Rackmount T...

Page 34: ...ve this subsection lists only warranted characteristics A list of typical characteristics starts on page 1 19 The electrical characteristics found in these tables of warranted characteris tics apply w...

Page 35: ...VRMS with peaks less than or equal to 30 V Lower Frequency Limit AC Coupled 10 Hz when AC 1 M Coupled 200 kHz when AC 50 Coupled4 1 To ensure the most accurate measurements possible run an SPC calibra...

Page 36: ...divisions in numeric field 1 The minimum sensitivity for obtaining a stable trigger A stable trigger results in a uniform regular display triggered on the se lected slope The trigger point must not sw...

Page 37: ...75 from 41_ C to 55_ C Altitude To 4570 m 15 000 ft operating To 12190 m 40 000 ft non operating Dynamics Random vibration without floppy disk installed 0 31 g rms from 5 to 500 Hz 10 minutes each axi...

Page 38: ...1 17...

Page 39: ...1 18...

Page 40: ...rements Sample calculation To measure the width of a 65 5 ns pulse at 2 GS sec sampling Time Measurement Error v 0 15 0 5 ns 1 10 4 65 5 ns 25 ns div B 1000 v 0 075 ns 0 007 ns 0 025 ns v 107 ps Frequ...

Page 41: ...cal Characteristics Time Base System Name Description Aperture Uncertainty v5 ps v250 ns div v50 ps w500 ns div Table 1 15 Typical Characteristics Triggering System Name Description Accuracy Trigger L...

Page 42: ...ith some performance dete rioration 1 The trigger position errors are typically less than the values given here These values are for triggering signals having a slew rate at the trigger point of 2 div...

Page 43: ...1 22...

Page 44: ......

Page 45: ...nent assem bly or part of this oscilloscope is referred to generically as a module This manual contains all the information needed for periodic maintenance of the TDS 620A 640A 644A Digitizing Oscillo...

Page 46: ...p tion Removal and Installation Procedures H Specification H Operating Information H Theory of Operation H Performance Verification H Adjustment Procedures H Maintenance H Options H Electrical Parts L...

Page 47: ...e oscilloscope is a module Symbols and terms related to safety appear in the Safety Summary found at the beginning of this manual Besides the symbols related to safety this manual uses the following s...

Page 48: ...cilloscopes to fit your require ments With this option Tektronix ships a calibration data report with the instrument With this option Tektronix ships a Certificate of Calibration This certificate stat...

Page 49: ...s of the same type Again each module comes with a 90 day service warranty Contact your local Tektronix service center or sales engineer for more information on any of the repair or adjustment services...

Page 50: ...2 6...

Page 51: ...G This instrument is safety Class 1 equipment IEC designation All accessible conductive parts are directly connected through the grounding conductor of the power cord to the grounded earthing contact...

Page 52: ...ord Plug Identification Ungrounded Line Brown Black Grounded Neutral Light Blue White Grounded Earthing Green Yellow Green Standard North American 115V Option A1 Universal Euro 230V Option A2 UK 230V...

Page 53: ...that the memory modules need to be replaced The following environmental requirements are provided to ensure proper operation and long instrument life The TDS 620A 640A 644A Digitizing Oscilloscopes ca...

Page 54: ...when either running a signal path compensation or when doing any of the adjustments de scribed in Section 5 To do so might result in the loss of internally stored adjustment constants 1 3 0 3 1 Adjus...

Page 55: ...2 11 0 0 0...

Page 56: ...2 12...

Page 57: ...2 13 WARNING...

Page 58: ...urces Graticule and waveforms Side menu area Readouts for measurements move here when CLEAR MENU is pressed Main menu display area Readouts in lower graticule area move here when CLEAR MENU is pressed...

Page 59: ...this front panel control block Vertical Function Controls Access all vertical functions and inputs from this front panel control block Horizontal Function Controls Access all horizontal functions from...

Page 60: ...ed on determines which waveform is positioned and scaled The indicator above the channel last selected is lighted Example Push then c Vertically 1 and horizontally 2 scale and position the waveform s...

Page 61: ...2 17 9 11 12 14 13 10 0 V...

Page 62: ...2 18 18 17 15 16...

Page 63: ...ing in the button label It also copies the readout to the general purpose knob readout area in the right corner of the screen Example Push 19 c Use the general purpose knob 20 to adjust the trigger le...

Page 64: ...2 20 H H H H 1 H 1 1 2 2 H 2 1 1 H 1 2 1 1 1 H 1 1 H 2 1 0 1 H 2 H 1 2 2 3 1 1 1 1 H H 1 H 1 1 2 2 H 1...

Page 65: ...2 21 H H Adjustment Procedures...

Page 66: ...2 22...

Page 67: ......

Page 68: ...evel is the low 0 state Signal states may also be described as true meaning their active state or false meaning their non active state The specific voltages that constitute a high or low state vary am...

Page 69: ...r system requests the waveform The processor system contains a 68020 micropro cessor that controls the entire instrument It includes the firmware It also includes a GPIB interface You can reprogram th...

Page 70: ...Front Panel Processor but passes through the A12 Front Panel board and the A11 DRAM Processor Display board to the low voltage power sup ply The front panel also generates the probe compensation sign...

Page 71: ...3 4...

Page 72: ......

Page 73: ...scilloscope will perform properly They can be used as a quick check before making a series of important measurements H To further check functionality first do the Self Tests just mentioned then do the...

Page 74: ...4 2 H H H H H Initialize the oscilloscope Initialize the oscilloscope H Pass...

Page 75: ...veform Reference Symbols Ground Levels and Waveform Sources Graticule and Waveforms Side menu area Readouts for measurements move here when CLEAR MENU is pressed Main menu display area Readouts in low...

Page 76: ...ternal diagnostics pass 0 Display the System diagnostics menu H H 0 3 3 Run the System Diagnostics H 0 H 3 3 Wait 2 3 Confirm no failures are found 0 3 Confirm the three adjustment sections have passe...

Page 77: ...g Wait Signal path compensation runs in about one to two minutes While it progresses a clock icon shown at left is displayed on screen When compensation completes the status message will be updated to...

Page 78: ...They do not verify that they operate within limits Therefore when the instructions in the functional tests that follow call for you to verify that a signal appears on screen that is about five divisio...

Page 79: ...e menu button 1 4 1 2 Verify that all input channels operate Do the following substeps test CH 1 first skipping substep a since CH 1 is already set up for verification from step 1 a Select an unverifi...

Page 80: ...and confirm that the following statements are true Refer to the icons at the left of each statement as you confirm those statements H mode displays an actively acquiring waveform on screen Note that t...

Page 81: ...about four divisions c The horizontal knob positions the signal left and right on screen when rotated 3 Remove the test hookup Disconnect the probe from the channel input and the probe compensation t...

Page 82: ...un H Verify that the delayed trigger system operates Select the delayed time base H H H H Select the delayed trigger level menu H H Confirm that the following statements are tru H H un H Verify the de...

Page 83: ...cation H Push the disk into the drive until it goes all the way in and clicks into place c Initialize the oscilloscope H Press save recall H Press the main menu button 2 0 H Press the side menu button...

Page 84: ...DS assign the name TEK00000 SET to your file H Press the side menu button H Verify that Digitizing Oscilloscope retrieved the saved setup from the disk Do this by noticing the horizontal for the main...

Page 85: ...done first then these procedures performed if desired The tests in this subsection comprise an extensive valid confirmation of performance and functionality when the following requirements are met H...

Page 86: ...quired Female BNC to dual banana Tektronix part number 103 0090 00 Various Accuracy Tests 7 Connector BNC T Male BNC to dual female BNC Tektronix part number 103 0030 00 Checking Trigger Sensitivity 8...

Page 87: ...6 1 26 10 37 22 05647 065 0 5 614 8 0 9 8 0 4 614 0 8 6410 2 46 07 4 5 61 56 1 26 10 37 22 05647 065 0 7 5 0 4 614 6410 2 46 07 4 5 61 56 1 26 10 37 22 05647 065 0 1 0 61 100 6145 6410 2 46 07 4 5 61...

Page 88: ...4 16...

Page 89: ...1 45 mV 68 5 mV 685 mV __________ __________ __________ __________ __________ __________ 1 45 mV 68 5 mV 685 mV CH1 5 mV Vert scale setting 5 Div position setting 1 0329 V __________ __________ 1 047...

Page 90: ...v position setting 11 405 V __________ __________ 11 795 V CH3 200 mV Vert scale setting 5 Div position setting 11 795 V __________ __________ 11 405 V CH3 1 V Vert scale setting 5 Div position settin...

Page 91: ...Glitch or Pulse WIdth Hor scale 1 ms Lower Limit Upper Limit 2 5 ns 2 5 ns 1 ms 1 ms __________ __________ __________ __________ __________ __________ __________ __________ 7 5 ns 7 5 ns 3 ms 3 ms Mai...

Page 92: ...4 20...

Page 93: ...ontrols Initialize the oscilloscope H H 5038 561 H 0 3 5038 5 H Modify the default settings H H H 0 7 3 H H 3 5 6 3 H H 6 5 0 34 H H Confirm input channels are within limits for offset accuracy at zer...

Page 94: ...for accuracy of offset since varying the position invalidates the check d Measure the test signal Rotate the general purpose knob to super impose the active cursor over the baseline DC test level Igno...

Page 95: ...ls Disconnect the hookup WARNING Performance of this procedure requires input voltages up to 92 VDC Be sure to set the DC calibration generator to 0 volts before connecting disconnecting and or moving...

Page 96: ...ual Banana to BNC Adapters BNC T Connector 1 0 b Initialize the oscilloscope H Press save recall H Press the main menu button H Press the side menu button c Modify the default settings H Press then pr...

Page 97: ...al purpose knob to precise ly align the active cursor to the DC baseline level on screen H Set the generator output to 500 mV H Press Use the general purpose knob to precisely align the alternate curs...

Page 98: ...Modify the default settings H H H H Confirm input channels are within limits for DC accuracy at maximum offset and position skipping substep 4a since CH 1 is already selected from step 3 Select an un...

Page 99: ...screen H Press the main menu button H Use the keypad to set vertical offset to the positive polarity setting listed in the table for the current vertical scale setting The baseline level will remain...

Page 100: ...a DC level equal to the offset plus 3 divisions First set vertical position and offsets to maximum no input Note gnd ref indicator bounded on screen for the offset baseline below screen Check against...

Page 101: ...ton 1 When checking 1 mV press the side menu button H Turn the horizontal knob to 50 ns When checking 1 mV set the horizontal to 10 s Press then press H Press the main menu button then press the side...

Page 102: ...ted c Set its input impedance H Press then press the main menu button 2 H Press the side menu button to toggle it to the setting d Set the vertical scale Set the vertical to one of the settings listed...

Page 103: ...so the CHx Pk Pk readout equals the reference amplitude in Table 4 4 that corresponds to the vertical scale set in substep d H Press the front panel button as necessary to trigger a stable display f...

Page 104: ...against limits H H H H Verify Internal Adjustment Self Compensation and Diagnostics Self Tests NOTE Passing the signal path compensation confirms the signal path for all vertical scale settings for al...

Page 105: ...channel last tested 2 1 One medium frequency leveled sine wave generator Item 11 one precision coaxial cable Item 5 one 50 terminator Item 4 and a dual input coupler Item 8 See page 4 13 DO NOT use th...

Page 106: ...save recall Now press the main menu button then press the side menu button c Save CH 3 for the TDS 640A or 644A or AUX1 for the TDS 620A waveform Move the coupler from to so that and are driven Press...

Page 107: ...the main menu button then press the side menu button H Press H Rotate the General Purpose knob to align one cursor to the time reference point of the left most waveform edge and the other cursor to t...

Page 108: ...4 36 Check against limits Disconnect the hookup...

Page 109: ...1 1 0 See page 4 13 1 Time Mark Generator 50 Coaxial Cable 1 5 4 0 0 1 Install the test hookup and preset the instrument controls Hook up the test signal source Initialize the oscilloscope H 0 3 01 0...

Page 110: ...aligned to the center vertical graticule line H Press the main menu button Press the side menu buttons 1 1 and 1 b Measure the test signal H Set the horizontal of the delayed time base to 250 ns H Us...

Page 111: ...et horizontal to 2 5 ns H Set the output of the generator for 20 ns markers H Press H Press then press Press the main me nu button then press the side menu button H Press H Press the main menu button...

Page 112: ...s 1 1 See page 4 13 Install the test hookup and preset the instrument controls Initialize the instrument H H H Modify the default setup H H H Medium Frequency Sine Wave Generator 10X Attenuator 50 Coa...

Page 113: ...its for pulse glitch or pulse width triggering Horizontal Scale 1 m Display the test signal 0 1 Set the trigger mode 1 1 Set upper and lower limits that ensure triggering H 1 2 H 1 H 1 1 H 1 H 1 1 Che...

Page 114: ...limit here the lower limit until triggering stops Confirm the trigger system is within time accuracy limits for pulse glitch or pulse width triggering horizontal scale 1 ms Set upper and lower limits...

Page 115: ...requisites listed under Performance Tests on page 4 13 HI LO Output Sense DC Calibrator 50 Coaxial Cables Dual Banana to BNC Adapter BNC T Connector 1 Install the test hookup and preset the instrument...

Page 116: ...libration generator to 10 volts The DC test level will appear on screen b H Press H Press H Read the measurement results from the readout below the label in the main menu not the trigger readout in th...

Page 117: ...Press the side menu button Read the measurement results in the side menu below the label 0 d Check against limits Do the following subparts in the order listed H CHECK that the 0 readout in the side m...

Page 118: ...t controls a Initialize the oscilloscope H Press save recall H Press the main menu button 0 H Press the side menu button 0 b Modify the initialized front panel control settings H Set the horizontal fo...

Page 119: ...ncy Sine Wave Generator To AUX TRIG INPUT on Rear Panel 2 7 6 1 01 2 Confirm Main and Delayed trigger systems are within sensitivity limits 50 MHz Display the test signal H 1 2 H H 3 7 4 12 3 7 5 H 3...

Page 120: ...e main menu button H Press CHECK that a stable trigger is obtained for the test waveform on both the positive and negative slopes Use the side menu to switch between trigger slopes use the knob to sta...

Page 121: ...ut indicates the amplitude is 250 mV Readout may fluctu ate around 250 mV b Check AUX trigger source for stable triggering at limits Do the following in the order listed H Use the definition for stabl...

Page 122: ...V H Disconnect the leveling head at and reconnect it to through a 5X attenuator d Repeat step 2 substeps b and c only since only the 500 MHz frequency is to be checked here 5 Confirm that the Main and...

Page 123: ...e test hookup and preset the instrument controls 50 Coaxial Cables To Main Trigger Out Calibration Generator Output 3 2 a Hook up test signal source 1 H TDS 620A Connect the standard amplitude output...

Page 124: ...c levels a Display the test signal H Press to turn off CH 1 H Press to display that channel H Set the vertical to 1 V H Use the vertical knob to center the display on screen b Measure logic levels H P...

Page 125: ...the 1 M setting H Press H CHECK that the readout is 2 5 volts and that the 2 readout is 0 7 volts 3 Confirm AUX 1 for TDS 620A or CH 3 for TDS 640A and 644A output is within limits for gain a Measure...

Page 126: ...ion cables Item 5 and one DC calibration generator Item 9 See page 4 13 Also the Digitizing Oscilloscope must have passed Check Accuracy Long Term Sample Rate Delay Time and Delta Time Measurement on...

Page 127: ...ress the main menu button then press the side menu button 1 H Select averages 2 Confirm that the Probe Compensator signal is within limits for frequency a Measure the frequency of the probe compensati...

Page 128: ...4 56 Save the probe compensation signal in reference memory H Ch 1 H H H H Hook up the DC standard source H H H...

Page 129: ...put of the DC calibration generator until it precisely overlaps the top upper level of the stored probe compensation signal This value will be near 500 mV H Record the setting of the DC generator H Ad...

Page 130: ...4 58 Check against limits H H Disconnect the hookup...

Page 131: ...d Wait for the Clock Icon to leave the screen e CONFIRM the digitizing oscilloscope is setup as shown below Channel CH1 Volt div 100 mV Horizontal scale 500 ms div 2 Setup digitizing oscilloscope for...

Page 132: ...n the TSG121 through a 75 cable and a 75 terminator to the oscilloscope s CH1 input H Press the PAL signal source s control the fourth TSG121 front panel button from the left 75 Cable PAL Signal Sourc...

Page 133: ...ess the main menu l Press m Press then press n Press the main menu 0 o Toggle the side menu to p Toggle the side menu to q Press the main menu r Press the main menu 1 s Use the keypad to set envelope...

Page 134: ...ck Triggered Signal Range Setup oscilloscope for Triggered Signal Test a Press b Press c Press d Use the keypad to set horizontal scale div to 50 s press m then e Press then press f Press the main men...

Page 135: ...ive pulse and a number of negative pulses see Figure 4 29 Positive pulse Negative pulses n Use the keypad to set the fine scale to 75 mV press then o CONFIRM that the LED stays lit and that the wavefo...

Page 136: ...Hz Rejection Test H Use the keypad to set the Ch1 Fine Scale to 282 mV press then H Press H Press H Press H Use the keypad set the fine scale to 2 V press then H Press H Use the keypad to set the hor...

Page 137: ...n free 1 0 c Check 60 Hz rejection H Use the keypad to set the horizontal scale div to 50 ms press m then H Reconnect the output of the signal generator SG 502 Connect the PAL signal source s composit...

Page 138: ...ugh a 75 cable and a 75 terminator to the CH2 input see Figure 4 33 Signal Generator SG 502 PAL Signal Source TSG121 COMPST COMPST W W W W W H CONFIRM that the LED stays lit and that the waveform on s...

Page 139: ...Test H Press H Press H Press H Press the main menu 0 2 H Press the side menu 21 41 H Press the main menu 0 5 4 H Use the keypad to set the horizontal scale to 250 ns press then b Check Line Count Accu...

Page 140: ...COMPST H Press the main menu H Press the side menu to H Press the main menu to H Press the side menu to H Use the knob to move the falling edge of the sync pulse to two divisions to the left of center...

Page 141: ...0 2 1 4 69 H H H H 1 H H 1 6 5 1 0 1 4 0 1 0 2 H H 1 0 H H 0 3 0 4 H 01...

Page 142: ...ss 10 10 SHIFT m then ENTER H Press the side menu V1 Stop Time H Use the keypad to sets V1 stop time to 10 50 s press 10 50 SHIFT m then ENTER H Press the main menu Type pop up to select Edge H Press...

Page 143: ...4 71 H 50 Cable Pulse Generator PG502 50 Terminator H NOTE You may need to adjust the trigger level control to obtain a stable trigger...

Page 144: ...m 0 H Turn the pulse generator s PERIOD variable control to adjust the period until the oscilloscope measurement reads m see Figure 4 40 Read note shown below NOTE The pulse duration and period adjus...

Page 145: ...al source from CH1 wait a few seconds then reconnect the signal H CONFIRM that the LED is lit and the waveform is stable H Press 3 03 H Press 3 H Push the pulse generator s button out H CONFIRM that t...

Page 146: ...4 74...

Page 147: ......

Page 148: ...ally adjusting the P6139A probe H A written procedure for manually adjusting the display assembly This procedure is used to return the digitizing oscilloscope to conformance with its Warranted Charact...

Page 149: ...required The system must also be equipped as follows H Eight MHz clock speed or faster H DOS 3 2 or higher H 640K Resident RAM with 580 K Available RAM H A hard drive H A high density floppy drive 3...

Page 150: ...djustment Software in sequence plus the P6139A probe adjustment if you are using the P6139A probe Throughout this section complete adjustment is used as just defined The adjustment software contains t...

Page 151: ...Attenuator Board Complete Adjustment Front Panel Assembly None Required Low Voltage Power Supply Complete Adjustment Processor Board Complete Adjustment Display Assembly Display Adjustment Only Some...

Page 152: ...e based Adjust ments 6 Cable GPIB IEEE Std 488 1 1987 IEEE Std 488 2 1987 Tektronix part number 002 0991 01 Software based Adjust ments 7 Coupler Dual Input Tektronix part number 067 0525 02 Software...

Page 153: ...number 067 0681 01 Tektronix part number 067 0681 01 Probe Adjustment The following instructions will guide you through installing the software on your system setting up the oscilloscope for adjustmen...

Page 154: ...ommands copy the TDS 620A 640A 644A Adjustment Software disk to a working disk 2 Install the software to hard disk a Install your working disk in a floppy drive and type install You will be asked to s...

Page 155: ...e the two small access holes on the right side of the oscillo scope cabinet near the front b Insert the adjustment tool Item 3 in the hole nearest the front of the oscilloscope about 1 2 inch to engag...

Page 156: ...alteration a Locate the two small access holes on the right side of the oscillo scope cabinet near the front See Figure 5 1 b Insert the adjustment tool Item 3 in the hole nearest the rear of the osci...

Page 157: ...2 3 3 1 04 3 04 1 One P6139A probe Item 16 1 41 1 Install the test hookup and preset the oscilloscope controls 41 8 7 4 1 1 2 3 a Hook up test signal source Install the probe to Connect the probe tip...

Page 158: ...be for best square wave compensation flat as possible across its top Probe compensated correctly Probe over compensated Probe under compensated 3 Disconnect the hookup Disconnect the probe from the pr...

Page 159: ...emove the retract able hook tip Second unscrew the ribbed ferrule tip cover and pull forward to remove Last pull forward to remove the ground lead assembly Expose the Inner Probe Tip High Frequency Si...

Page 160: ...o trigger the signal H Press Then press H Press the main menu button Then press the side menu button 1 H Press H Press the main menu button 5 2 0 Then press the side menu button 5 3 H Press the main m...

Page 161: ...procedure if you have successfully completed Measure Probe Bandwidth Probe adjustment is complete One calibration generator Item 10 one 50 preci sion cable Item 8 one tunnel diode pulser Item 17 one f...

Page 162: ...0 5 15 Calibration Generator Tunnel Diode Pulser 10X attenuator Precision Cable 3 2 H H H H H 1 H 1 H H H H H H...

Page 163: ...5 16 H 0 H 0 H H 2 2 H H 1 H H 2 2 H H 2 2 H 2 Display the test signal H H 2 2 2 2 2 2 2 H H 2 2 H H 2 2 H H 0 Make the adjustments H 2 H 0 2...

Page 164: ...obe Bandwidth H Adjust Probe High Frequency Response H H not H First adjust R1 for best overall match Second adjust R2 and C1 for best match between front corners Third repeat the first two steps as n...

Page 165: ...tometer with a J6503 Luminance Probe Item 15 1 See in Section 6 to remove the cabinet 2 a H Leave the oscilloscope powered off H Set the DIP switch located near the front of the A11 DRAM Proces sor Di...

Page 166: ...nes in the 5 luminance patch see Figure 5 12 just disappear while the lines in the 10 luminance patch are just visible when both are viewed through the magnifier 10 Patch 5 Patch 0 3 Adjust the displa...

Page 167: ...a J16 photometer and a luminance probe H Adjust R572 CONTRAST for a reading of 50 foot lamberts if the gray display shield is installed adjust for 110 foot lamberts if the shield is missing 4 Restore...

Page 168: ...ly press the main menu button System until Diag Err is highlighted in the pop up menu H Repeatedly press the main menu button Area until Display is highlighted in the pop up menu H Repeatedly press th...

Page 169: ...pattern H Press the center main menu button to display the main menu H Press the main menu button H Repeatedly press the side menu button until appears in the side menu Push H Press the main menu but...

Page 170: ...5 23 H NOTE The adjustments for contrast and brightness interact with each other Restore the oscilloscope to normal operation Removal and Installation Procedures...

Page 171: ...5 24...

Page 172: ......

Page 173: ...e of these internal diagnostic routines to speed fault isolation to a module The following sections contain information procedures related to mainte nance H Section 2 covers instructions useful when o...

Page 174: ...c sensitive modules 3 Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules Do service of static sensitive modules only at a static free...

Page 175: ...1 0 6 3 3 5 4 1 0 2 5 0 1 0 2 1 0 1 1 1 3 0 5 3 3...

Page 176: ...6 4...

Page 177: ...ge the plastics used in this oscilloscope Use only deionized water when cleaning the menu buttons or front panel buttons Use a 75 isopropyl alcohol solution as a cleaner and rinse with deionized water...

Page 178: ...6 6 CAUTION To prevent getting moisture inside the oscilloscope during external cleaning use only enough liquid to dampen the cloth or applicator...

Page 179: ...6 7 Removal and Installation Procedures CAUTION To prevent damage from electrical arcing ensure that circuit boards and components are dry before applying power to the oscil loscope...

Page 180: ...loscope may be spray washed using a solution of 75 isopropyl alcohol by doing steps 4 through 8 4 Gain access to the parts to be cleaned by removing easily accessible shields and panels see Removal an...

Page 181: ...that follow H List of tools required to remove all modules H Three module locator diagrams for finding the External Modules see Figure 6 1 Outer Chassis Modules see Figure 6 2 and Inner Chassis Modul...

Page 182: ...re Table of Contents H Access Procedure H Procedures for External Modules H Procedures for Outer Chassis Modules H Procedures for Inner Chassis Modules H Disassembly for Cleaning Inspection and Cleani...

Page 183: ...e 1 Screwdriver handle Accepts TorxR driver bits 003 0301 00 2 T 15 Torx tip TorxR driver bit for T 15 size screw heads 003 0966 00 3 T 20 Torx tip TorxR driver bit for T 20 size screw heads 003 0866...

Page 184: ...d Fuse Cap Handle Trim Ring Front Panel Knobs Front Cover Line Fuse Handle Cap Attenuator Cover Foot Pad Flip Stand Cabinet Rear Cover A12 Front Panel Assembly Foot Display Frame Menu Buttons EMI Gask...

Page 185: ...6 13 Analog and Digital Power Cables A14 D1 Bus Rear Chassis Fan A10 Acquisition Board A15 Attenuator Assembly Top Cover Board Bracket A23 SerPar Board A11 DRAM Processor Display Board...

Page 186: ...6 14 A16 Power Supply Front Subpanel A20 Display Assembly Main Chassis...

Page 187: ...6 15 A16 Power Supply Front Subpanel A30 Display Assembly Main Chassis...

Page 188: ...dule remove it Front Cover Trim Ring Menu Buttons and Attenuator Panel Procedures for External Modules Procedures for Outer Chassis Mod ules If the module is an inner chassis module access the inner c...

Page 189: ...e and Line Cord H EMI Gaskets H Rear Cover and Cabinet H Front Cover Trim Ring Menu Buttons and Attenuator Panel H A12 Front Panel Assembly H Display Frame H Cabinet Modules Assemble equipment and loc...

Page 190: ...s to be removed Have a flat bladed screwdriver Item 5 handy Locate the line fuse and line cord in the locator diagram External Modules Figure 6 1 2 Orient the oscilloscope Set the oscilloscope so its...

Page 191: ...6 19 Remove line fuse Remove line cord Reinstallation Line Fuse Fuse Cap 1 Unplug 2 Rotate 3 Pull Rear Cover and Cabinet...

Page 192: ...d or snag the cabinet on the oscilloscope s internal cabling as you remove it DO NOT do steps 6 through 8 to remove the EMI gasket s unless they must be replaced due to damage If you are not replacing...

Page 193: ...snag the cabinet on internal cabling re dress cables an necessary c When sliding the cabinet be sure that the front edge of the cabinet aligns with the groove containing the EMI shield on the front c...

Page 194: ...6 22...

Page 195: ...Set the oscilloscope so its rear is down on the work surface and its bottom is facing you 3 Remove the front cover Grasp the front cover by its left and right edges and snap it off of the front subpa...

Page 196: ...6 24 Remove the trim ring Remove the attenuator panel Reinstallation...

Page 197: ...nel buttons Unless either of those modules are being serviced do not do step 4 Further disassem bly of front panel assembly Assemble equipment and locate modules to be removed R External Modules Front...

Page 198: ...6 26 P3 Front Panel Assembly To J2 of A11 DRAM Processor DisplayBoard Further disassembly of front panel assembly Front Panel Knobs...

Page 199: ...6 27 Reinstallation Front Cover Trim Ring Menu Buttons and Attenuator Panel...

Page 200: ...the front cover and trim ring b Lift the front panel assembly out of the front subpanel until you can reach J2 on the front panel assembly Disconnect the flex cable coming from the display frame asse...

Page 201: ...off c Repeat procedure to remove the remaining cap as needed push the cap s back on to reinstall 5 Remove the flip stand Grasp the flip stand by both sides near where it joins each flip stand foot Now...

Page 202: ...6 30 Handle Removal Flip Stand Removal Foot Removal Handle Cap Removal Push down to flex handle and flatten against cabinet then pull it out...

Page 203: ...s top is down on the work surface and its front is facing you 3 Remove the Attenuator Assembly a Unplug each of the four interconnect cables that connect the at tenuators to the Acquisition board from...

Page 204: ...ent the oscilloscope Set the oscilloscope so its bottom is down on the work surface and its left side is facing you 3 Disconnect the fan from processor display board Unplug the fan s power cable from...

Page 205: ...rom its two plug in connectors J28 is the connector on the processor display board J100 is on the acquisition board Reverse these removal instructions to reinstall 4 a Unplug the analog power cable at...

Page 206: ...b When installing the D1 bus be sure to orient it so the single connec tor at the bottom of the bus plugs into the acquisition board c See the following procedures in the order listed to complete reas...

Page 207: ...6 35 Remove circuit board assembly R Remove circuit board from assembly...

Page 208: ...6 Replace circuit board R Replaceable Parts List Circuit Board Removal From Assembly Remove circuit board from as sembly H Front Cover Trim Ring Menu Buttons and Attenuator Panel H Rear Cover and Cabi...

Page 209: ...ork surface and its front is facing you 3 Disconnect the fan from processor display board Unplug the fan s power cable from J20 4 Remove the processor display board Figure 6 16 shows the A29 Video Tri...

Page 210: ...6 38...

Page 211: ...6 39...

Page 212: ...6 40...

Page 213: ...igures 6 16 and 6 17 Failure to do this may impair performance Also when plugging in the digital bus boards 1 and 3 in Figure 6 18 make sure that they remain plugged in on both ends A14 D1 Bus and Ana...

Page 214: ...crews mounting the support bracket in the rear panel Then lift it out from the rear panel b Unplug the interconnect cable from the GPIB connector on the rear cover at J35 of the processor display boar...

Page 215: ...6 43 First unplug the cables at J38 and J35 Second slide the A11 DRAM Processor Display board to the rear to release if from the board mounts then lift up to complete removal J38 J35 J5 J62 J51 J37 J2...

Page 216: ...nt and locate modules to be removed R board mount Outer Chassis Modules A14 D1 Bus and Analog Power and Digital Power Cables A11 Processor Display Board Orient the oscilloscope Remove the top cover Re...

Page 217: ...isplay board b Working from the rear panel and using the 1 4 inch nut driver un screw the two hex headed mounting posts that secure the cable to the rear chassis c Working from inside the oscilloscope...

Page 218: ...wn on the work surface and its front is facing you 3 Remove the Acquisition Board Use Figure 6 21 as a guide a Unplug each of the four interconnect cables that connect the at tenuators to the acquisit...

Page 219: ...3 SIGNAL OUT AUX TRIGGER INPUT MAIN TRIGGER OUTPUT DELAYED TRIGGER OUTPUT J1201 Reinstallation acquisition board H A14 D1 Bus and Analog Power and Digital Power Cables H Front Cover Trim Ring Menu But...

Page 220: ...onnector ribbon interconnect cable that connect the disk drive to the A11 Processor Display board b You can either remove the disk drive by itself or the drive with its holding bracket To remove the d...

Page 221: ...6 49 J38 Reinstallation floppy disk H Front Cover Trim Ring Menu Buttons and Attenuator Panel H Rear Cover and Cabinet...

Page 222: ...e following substeps a Unplug the GPIB interconnect cable at J32 of the processor display board b Remove the 6 screws securing the rear chassis to the main chassis and the two screws securing it to th...

Page 223: ...6 51 CH3 OUT TO J1201 AUXILIARY TRIGGER TO J1550 MAIN TRIGGER TO J1000 DELAY TRIGGER TO J1001 EMI GASKET...

Page 224: ...you 3 Remove the low voltage power Supply a Working from the rear of the oscilloscope remove the two screws securing the low voltage power supply to the rear chassis See Figure 6 24 b Now working from...

Page 225: ...ndicated to clear the lip of the main chassis when lifting this board out NOTE Replaceable Parts List 1 Have handy a screwdriver with a size T 15 TorxR tip Items 1 and 2 Locate the modules to be remov...

Page 226: ...connector from the back of the display tube and the display tube yoke connector from the display circuit board J170 J305 and J570 Loosen the screw on the video board that holds the CRT sockets Then pu...

Page 227: ...6 55 WARNING WARNING WARNING WARNING J305 J170 J570 J350...

Page 228: ...6 56 Remove the display supply board...

Page 229: ...Move Circuit Board Forward to Clear Main Chassis Reinstallation H Top Cover and Board Brackets H A11 Processor Display Board H A14 D1 Bus and Analog Power and Digital Power Cables H Display Frame Ass...

Page 230: ...up away from the main chassis to complete the removal 4 Reinstallation Do the following substeps to reinstall the front subpanel and reassemble the remainder of the oscilloscope a Align the front sub...

Page 231: ...6 59 Additional Modules Removed Remove the main chassis Disassembly for Cleaning Disassembly for Cleaning Reinstallation Disassembly for Cleaning...

Page 232: ...Front Cover Trim Ring Menu Buttons and Attenuator Panel page 6 23 d Front Subpanel page 6 58 and Display Frame Assembly 3 Remove the outer chassis modules Do in order the following procedures They are...

Page 233: ...led The necessary connections will be made when you install the missing module later b Reinstall the inner chassis modules Do in the order listed the follow ing procedures When doing these procedures...

Page 234: ...install external modules Procedures for External Modules H Front Subpanel H Display Frame Assembly H Front Cover Trim Ring Menu Buttons and Attenuator Panel H Rear Cover and Cabinet H Line Fuse and Li...

Page 235: ...6 63 Removal and Installation Procedures Display the System diagnostics menu Run the System Diagnostics Wait...

Page 236: ...protected position before updating the Firmware Figure 6 29 shows how to set the switch After loading the Firmware be sure you set the switch back to the protected position and cycle power Optional Ac...

Page 237: ...6 65 0 0 0 1 Rear Cover and Cabinet 0 0 0 0 0 0 0 0 1 0 0...

Page 238: ...Display module Note The replacement module may not have the correct firmware loaded See page 6 64 for details on firmware updates Replace the A11 DRAM Processor Display module Yes No Power on again an...

Page 239: ...ooting procedure The oscilloscope should be ok Run the extended diagnostics the discussion of the Diagnostics on page 6 51 explains how to do this and verify that all the modules pass Did the Front Pa...

Page 240: ...r supply voltages on the A17 Main LV Power Supply module see Table 6 6 and Figure 6 32 If necessary temporarily short pins 3 and 5 of J5 to toggle the On Standby Control circuit The Low Voltage Power...

Page 241: ...6 69 1 0 1 0 1...

Page 242: ...6 70 J5 A17 Main LV Power Supply Module 1 39 1 39 J6...

Page 243: ...J5 pins 1 and 2 at 25 V and J5 pins 3 and 4 at 5 1 V No Yes On the A11 DRAM Processor Display module probe J27 but DO NOT REMOVE the cable from the connector The voltages will change if the A11 DRAM P...

Page 244: ...6 72 J18 pin 1 Horizontal Sync J18 pin 2 Vertical Sync J62 pin 1 Video White Level Black Levels Blanking Levels...

Page 245: ...nd disconnect the cable from J5 on the A11 DRAM Processor Display module see Figure 6 45 then power back on Are J5 pins 1 and 2 at 25 V and J5 pins 3 and 4 at 5 1 V No Yes On the A11 DRAM Processor Di...

Page 246: ...6 74 J18 pin 1 Horizontal Sync J18 pin 2 Vertical Sync J62 pin 1 Video White Level Black Levels Blanking Levels...

Page 247: ...6 75...

Page 248: ...er off the oscilloscope remove the cable from J2 of the A11 DRAM Processor Display module see Figure 6 43 and power back on Is there a 3 125 MHz clock on J2 pin 25 Probe J2 pin 2 6 7 11 16 Are these p...

Page 249: ...shooting procedure Replace the A15 Attenuator module Replace the A10 Acquisition module Is a 1 kHz 0 250 V square wave displayed now Set all the channels to the same vertical scale and select a channe...

Page 250: ...6 78 CAUTION Only probe points specified in the procedures You can cause catastrophic damage if you attempt to probe other points Pin 100 Pin 1 Pin 17 Pin 3 Pin 5 Pin 4 Pin 3...

Page 251: ...6 79...

Page 252: ...6 80 Pin 5 Pin 7 Pin 9 Pin 11...

Page 253: ......

Page 254: ...versal European 220 V 50 Hz A2 UK 240 V 50 Hz A3 Australian 240 V 50 Hz A4 North American 240 V 60 Hz A5 Switzerland 220 V 50 Hz With this option Tektronix ships the K218 Scope Cart The cart can help...

Page 255: ...n Tektronix ships the oscilloscope equipped with a RS 232 and a Centronics interface that can be used to obtain hardcopies of the oscilloscope screen With this option Tektronix ships the instrument wi...

Page 256: ...are traceable to the National Institute of Standards and Technology an accepted value of a natural physical constant or a ratio calibration technique The calibration is in compliance with US MIL STD...

Page 257: ...ve low capacitance low impedance ZO probe Provides 100X when ordered with Option 25 H P6139A 10X Passive probe H P6009 Passive high voltage probe 100X 1500 VDC Peak AC H P6015A Passive high voltage pr...

Page 258: ...r 500 to 950 nm DC to 850 MHz 1 V mW H P6703A Opto Electronic Converter 1100 to 1700 nm DC to 1 GHz 1 V mW H P6711 Opto Electronic Converter 500 to 950 nm DC to 250 MHz 5 V mW H P6713 Opto Electronic...

Page 259: ...7 6...

Page 260: ......

Page 261: ...8 1 Mechanical Parts List...

Page 262: ...8 2...

Page 263: ......

Page 264: ...ymbols depict the logic function performed and can differ from the manufacturer s data The tilde preceding a signal name indicates that the signal performs its intended function when in the low state...

Page 265: ...9 2...

Page 266: ...9 3...

Page 267: ...9 4...

Page 268: ...E CONSOLE SERVICE PORT J390 16 PINS J170 J50 16 J5 16 PINS J28 100 PINS D1 BUS A14 P28 100 PINS P100 100 PINS J26 40 PINS 40 P1 100 PINS J62 2 J285 2 PINS J60 J70 J280 J150 J300 J400 6 J501 2 PINS J50...

Page 269: ...9 6 A20 CRT Driver for Monochrome Models only TDS 620A and TDS 640A...

Page 270: ......

Page 271: ...ument modification number if applicable If a part you order has been replaced with a different or improved part your local Tektronix service center or representative will contact you concerning any ch...

Page 272: ...r Component Attaching parts for Assembly and or Component END ATTACHING PARTS Detail Part of Assembly and or Component Attaching parts for Detail Part END ATTACHING PARTS Parts of Detail Part Attachin...

Page 273: ...NORTH MAIN NEWBERG OR 97132 0KB01 STAUFFER SUPPLY 810 SE SHERMAN PORTLAND OR 97214 0KB05 NORTH STAR NAMEPLATE 1281 S NE 25TH HILLSBORO OR 97124 00779 AMP INC 2800 FULLING MILL PO BOX 3600 HARISBURG PA...

Page 274: ...13 200 3696 01 1 COVER FRONT PLASTIC STANDARD ACCESSORY 80009 200369601 14 101 0142 00 1 TRIM DECORATIVE FRONT TK1163 ORDER BY DESC 15 334 8571 00 334 8615 00 334 8616 00 1 1 1 MARKER IDENT MKD TDS64...

Page 275: ...10 5 External Modules...

Page 276: ...0890 01 2 LOCK CONNENCTOR 4 40 X 0 312L HEX HD STL TDS620A 640A QTY 2 TDS644A QTY 6 00779 205818 2 10 348 1300 00 2 SHLD GSKT ELEK 3 165 L CLIP ON 30817 0098 0564 09 03 11 211 0730 00 6 SCR ASSEM WSHR...

Page 277: ...10 7...

Page 278: ...DS644A ONLY 80009 80009 640 0071 03 640 0077 06 2 348 1300 00 2 SHLD GSKT ELEK 3 165 L CLIP ON 30817 0098 0564 09 03 3 119 4415 01 1 POWER SUPPLY SWITCHING 300W MULTI OUT A16 1GM54 ORDER BY DESC 4 441...

Page 279: ...10 9...

Page 280: ...C 0KB05 346 0266 00 5 174 1519 00 2 CA ASSY SP RIBBON IDC 40 28 AWG 5 4 L 2X20 TK1899 ORDER BY DESC 6 174 1728 00 1 CA ASSY SP RIBBON IDC 26 28 AWG 6 0 L 2X13 53387 ORDER BY DESC 174 2031 00 2 CABLE A...

Page 281: ...10 11...

Page 282: ...1 1 BRKT DISK DRIVE ALUMINUM 0J9P9 407 4230 01 6 337 3935 00 1 SHLD DISK DRIVE 0JR05 337 3935 00 7 119 5677 01 1 DISK DRIVE FLOPPY 3 5 INCH 1 44MB 50356 FD 04HF 2300 8 407 4460 xx 1 SHIELD FDD NOISE S...

Page 283: ...10 13...

Page 284: ...OPTION A5 SWITZERLAND S3109 ORDER BY DESC 1 CABLE ASSY PWR 3 18 AWG 92 L SVT TAN STANDARD CABLE SEE FIGURE 10 1 2 343 0170 00 1 RTNR CA TO CA U W 0 25 OD CABLES OPTIONS A1 A2 A3 A4 A5 0JR05 ORDER BY...

Page 285: ...SFER 34416 2622RW 7T 7B 016 1145 00 1 HOOD ASSEMBLY TDS SERIES 80009 016114500 016 1236 00 1 MOUNTING KIT RACK MOUNT KIT 80009 016123600 063 1514 01 1 SOFTWARE PKG FIRMWARE VERS 3 4E 1 3 5 TDS644A ONL...

Page 286: ...10 16...

Page 287: ......

Page 288: ......

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