Tektronix TAS 465 User manual
Service Manual
TAS 465
Analog Oscilloscope
B020100 and Above
070-9403-00
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.
Copyright ETektronix, Inc. 1995. All rights reserved.
Tektronix products are covered by U.S. and foreign 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.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
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Attenuators A1 3Ć4........................................
Probe Coding Interfa e A1 3Ć4.............................
Analog A quisition Hybrid A1 3Ć4...........................
External Trigger A1 3Ć4....................................
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Pro essor Subsystem A5 3Ć4...............................
ROM/RAM Subsystem A5 3Ć5..............................
Readout Subsystem A5 3Ć5................................
FrontĆPanel Interfa e Subsystem A5 3Ć5.....................
Analog Board Interfa e Subsystem A5 3Ć5...................
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Verti al Output A3 3Ć6.....................................
Horizontal Output A3 3Ć6..................................
High Voltage A3 3Ć6.......................................
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Menu Swit hes A4 3Ć7.....................................
CPU A4 3Ć7..............................................
FPP Pots & Probes A4 3Ć7.................................
LEDs & Driver A4 3Ć7......................................
Swit hes A4 3Ć8..........................................
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Fun tional Tests Prerequisites 4Ć4...........................
Verify the Probe Compensator Output 4Ć4...................
Verify the Input Channels 4Ć5...............................
Verify the Alt/Chop and Add Fun tions 4Ć6...................
Verify the Time Base 4Ć6...................................
Verify the Trigger System 4Ć7...............................
Verify the External Trigger 4Ć9..............................
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Horizontal Sweep Path 4Ć9.................................
Vertical Signal Path 4Ć11....................................
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Check DC Gain and Voltage Measurement Accuracy 4Ć15......
Check Trigger Level Accuracy 4Ć16..........................
Check DC Coupling Bandwidth 4Ć17.........................
Check ĆAxis Gain 4Ć19.....................................
$'-$#)! ,()" ( .
Check Time Base and Time Cursor Accuracy 4Ć20.............
Check Dual Delay Accuracy 4Ć22............................
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Check Trigger Sensitivity 4Ć24...............................
Video Trigger Sensitivity 4Ć29................................
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Personnel 5Ć1............................................
Access to Adjustments 5Ć1.................................
WarmĆUp Period 5Ć1......................................
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Complete Adjustment 5Ć3..................................
Partial Adjustment 5Ć3.....................................
Adjustment Dependencies 5Ć3.............................
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Power Supply Adjustment 5Ć4..............................
CRT Adjustments 5Ć5.....................................
Low Frequency Output Compensation 5Ć6...................
Factory Horizontal Cal 5Ć8.................................
Factory Vertical Cal 5Ć12....................................
High Frequency Step Response 5Ć15.........................
Attenuator Compensation 5Ć16..............................
Vertical Gain Adjust (Cabinet On) 5Ć18........................
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Warranty Service 6Ć1......................................
Repair or Calibration Service 6Ć2............................
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Inspection Ċ Exterior 6Ć6..................................
Cleaning Proce ure Ċ Exterior 6Ć6.........................
Cleaning Proce ure Ċ Interior 6Ć7..........................
Cleaning the CRT Implosion Shiel 6Ć7......................
")+1( *! *./((/&+* -+ "!0-". 5
-",-/&+*6 ("." "! 5
Cable Removal 6Ć9.......................................
General Instructions 6Ć10...................................
Summary of Proce ures 6Ć10...............................
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Line Cor 6Ć14............................................
Line Fuse 6Ć15............................................
-+*/5*"( *+. *! %#/. 5
Removing FrontĆPanel Knobs an Shafts 6Ć16.................
Installing FrontĆPanel Knobs an Shafts 6Ć16..................
""/ "- +1"- *! &*"/ 5
Rear Cover 6Ć18...........................................
Cabinet 6Ć18..............................................
Replacing the Front Feet 6Ć18...............................
-+*/5*"( -&) "*0 *! +2"- 0//+*. .'"/ 5
Removing the Front Trim 6Ć18...............................
Menu Buttons an Elastomer 6Ć19...........................
Power Button Replacement 6Ć19.............................
Installing the Front Trim 6Ć19................................
Installing the EMI Gaskets 6Ć20..............................
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FrontĆPanel Mo ule Disassembly/Assembly 6Ć22..............
Reassembly of the Front Panel Mo ule 6Ć24...................
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Table of Contents
TAS 465 Service Manual v
Fan and Fan Mount 6Ć30......................................
"
"
CRT 6Ć32.....................................................
"
"
CRT Light Guide 6Ć36.........................................
CRT Front Bracket 6Ć36.......................................
A2 Display Control Board 6Ć37.................................
A63 Power Supply Module 6Ć38................................
! "
! "
Troubleshooting 6Ć41.............................................
Troubleshooting Procedure 6Ć41...............................
Equipment 6Ć41..............................................
Symptom Matrix 6Ć42.........................................
Repackaging Information 6Ć51....................................
Options
Options A1-A5: International Power Cords 7Ć1................
arrantyĆPlus Service Options 7Ć1............................
Option 3R: Rackmount 7Ć1...................................
Option 02: Front Cover and Pouch 7Ć2........................
Option 23: Additional Probes 7Ć2.............................
Option 9C: Certificate of Calibration and Test Data Report 7Ć2..
Replaceable Electrical Parts List
Diagrams
Diagrams and Circuit Board Illustrations 9Ć1......................
Symbols 9Ć1................................................
Component Values 9Ć1.......................................
Graphic Items and Special Symbols Used in This Manual 9Ć1...
Component Locator Diagrams 9Ć2............................
Replaceable Mechanical Parts List
vi
vii
Figure 2Ć1:ăRear Panel 2Ć1........................................
Figure 2Ć2:ăFuse Compartment 2Ć2................................
Figure 2Ć3:ăPOWER Button 2Ć2....................................
Figure 2Ć4:ăProbe Compensation Signal Displayed after AUTOSET 2Ć5.
Figure 2Ć5:ăConnections for Compensating a Probe 2Ć5..............
Figure 2Ć6:ăHow Probe Compensation Affects Signals 2Ć7............
Figure 2Ć7:ăLocation of Probe Head Adjustment 2Ć7..................
Figure 2Ć8:ăMenu Map 2Ć8........................................
Figure 3Ć1:ăBlock Diagram 3Ć2....................................
Figure 4Ć1:ăGraticule References 4Ć2...............................
Figure 4Ć2:ăTest Hookup for Functional Tests 4Ć4....................
Figure 4Ć3:ăHorizontal Adjustments (One) 4Ć10.......................
Figure 4Ć4:ăHorizontal Adjustments (Two) 4Ć10.......................
Figure 4Ć5:ăHorizontal Adjustments (Three) 4Ć11......................
Figure 4Ć6:ăGain and oltage Test Setup 4Ć15........................
Figure 4Ć7:ăTrigger Level Test Setup 4Ć17............................
Figure 4Ć8:ăBandwidth Test Setup 4Ć18..............................
Figure 4Ć9:ăXĆAxis Gain Test Setup 4Ć19.............................
Figure 4Ć10:ăTiming Test Setup 4Ć20................................
Figure 4Ć11:ăDual Delay Test Setup 4Ć23.............................
Figure 4Ć12:ăTrigger Sensitivity Test Setup (One) 4Ć25.................
Figure 4Ć13:ăTrigger Sensitivity Test Setup (Two) 4Ć26.................
Figure 4Ć14:ăTrigger Sensitivity Test Setup (Three) 4Ć27................
Figure 4Ć15:ăTrigger Sensitivity Test Setup (Four) 4Ć27.................
Figure 4Ć16:ă ideo Trigger Test Setup 4Ć29...........................
Figure 5Ć1:ăLocation of Boards for Adjustments 5Ć2..................
Figure 5Ć2:ăCRT Adjustments Calibration Setup 5Ć5..................
Figure 5Ć3:ăLow Frequency Output Compensation Calibration
Setup 5Ć7...................................................
Figure 5Ć4:ăHorizontal Adjustments (One) 5Ć9.......................
Figure 5Ć5:ăHorizontal Adjustments (Two) 5Ć9.......................
Figure 5Ć6:ăHorizontal Adjustments (Three) 5Ć10......................
Figure 5Ć7:ăHorizontal Output Calibration Setup 5Ć11..................
Figure 5Ć8:ăFactory ertical Calibration Setup 5Ć13....................
Figure 5Ć9:ăExternal Trigger Calibration Setup 5Ć13...................
Figure 5Ć10:ă ertical Adjustments 5Ć14..............................
Figure 5Ć11:ăAdjusting ertical Gain and Centering 5Ć15...............
viii
Figure 5Ć12:ăHigh Frequency Step Response Test Setup 5Ć16..........
Figure 5Ć13:ăAttenuator Compensation Test Setup 5Ć17................
Figure 5Ć14:ăDisplay Driver Board Adjustment Locations 5Ć20..........
Figure 5Ć15:ăAnalog Board Adjustment Locations 5Ć21................
Figure 5Ć16:ă ower Supply Adjustment Location 5Ć22.................
Figure 5Ć17:ăLocation of J205 (CAL-DIS) on the C U Board 5Ć23......
Figure 6Ć1:ăOscilloscope Orientation 6Ć10............................
Figure 6Ć2:ăCabinet and FrontĆ anel Mounted Modules 6Ć12...........
Figure 6Ć3:ăInternal Modules 6Ć13...................................
Figure 6Ć4:ăCables and Cable Routing 6Ć14..........................
Figure 6Ć5:ăLine Fuse and Line Cord Removal 6Ć15...................
Figure 6Ć6:ăKnob and Shaft Removal 6Ć16...........................
Figure 6Ć7:ăRear Cover, Cabinet, and Feet Removal 6Ć17..............
Figure 6Ć8:ăTrim Ring and Menu Buttons Removal 6Ć20................
Figure 6Ć9:ăEMI Gasket Installation 6Ć21.............................
Figure 6Ć10:ăA62 Front anel Module Removal 6Ć22...................
Figure 6Ć11:ăDisassembly of FrontĆ anel Assembly 6Ć23...............
Figure 6Ć12:ăFrontĆ anel Ground Spring 6Ć24........................
Figure 6Ć13:ăMenu Flex Circuit Board Removal 6Ć25...................
Figure 6Ć14:ăA1 Analog Board Removal 6Ć27.........................
Figure 6Ć15:ăLocation of Display Driver Board 6Ć28....................
Figure 6Ć16:ăCRT Implosion Shield Removal 6Ć29.....................
Figure 6Ć17:ăFan Mount Removal 6Ć30..............................
Figure 6Ć18:ăFan and Fan Mount Removal 6Ć31.......................
Figure 6Ć19:ăCRT Rear Bracket and Ground Wire 6Ć33.................
Figure 6Ć20:ăCRT Removal 6Ć35....................................
Figure 6Ć21:ăRemoving the CRT Front Bracket 6Ć37...................
Figure 6Ć22:ăRemoving the Display Control Board 6Ć38................
Figure 6Ć23:ă ower Button Shaft Disconnect 6Ć39.....................
Figure 6Ć24:ă ower Supply Removal 6Ć39............................
Figure 6Ć25:ăA5 C U Board Troubleshooting rocedure 6Ć44...........
Figure 6Ć26:ăA1 Analog Board Troubleshooting rocedure 6Ć45........
Figure 6Ć27:ăA3 Display Driver Board Troubleshooting rocedure 6Ć47..
Figure 6Ć28:ăA62 Front anel Module Troubleshooting rocedure 6Ć49..
Figure 6Ć29:ăA2 Display Control Board Troubleshooting rocedure 6Ć50.
ix
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x
xi
TableĂ1Ć1:ăNominal Traits Ċ Vertical Deflection System 1Ć5...........
TableĂ1Ć2:ăNominal Traits Ċ Time Base System 1Ć6..................
TableĂ1Ć3:ăNominal Traits Ċ Triggering System 1Ć6..................
TableĂ1Ć4:ăNominal Traits Ċ Video Triggering System 1Ć6............
TableĂ1Ć5:ăNominal Traits Ċ Cursors 1Ć7...........................
TableĂ1Ć6:ăNominal Traits Ċ Y Operation 1Ć7......................
TableĂ1Ć7:ăNominal Traits Ċ Setup Memory Characteristics 1Ć7.......
TableĂ1Ć8:ăNominal Traits Ċ Power Fuse 1Ć7........................
TableĂ1Ć9:ăNominal Traits Ċ Mechanical 1Ć8........................
TableĂ1Ć10:ăWarranted Characteristics Ċ Vertical Deflection
System 1Ć9.................................................
TableĂ1Ć11:ăWarranted Characteristics Ċ Time Base System 1Ć11......
TableĂ1Ć12:ăWarranted Characteristics Ċ Triggering System 1Ć12......
TableĂ1Ć13:ăWarranted Characteristics Ċ Video Triggering 1Ć13........
TableĂ1Ć14:ăWarranted Characteristics Ċ Cursors 1Ć13................
TableĂ1Ć15:ăWarranted Characteristics Ċ Y Operation 1Ć13...........
TableĂ1Ć16:ăWarranted Characteristics Ċ Power Requirements 1Ć14....
TableĂ1Ć17:ăWarranted Characteristics Ċ Environmental and Safety 1Ć14
TableĂ1Ć18:ăTypical Characteristics Ċ Vertical Deflection System 1Ć15...
TableĂ1Ć19:ăTypical Characteristics Ċ Time Base System 1Ć15.........
TableĂ1Ć20:ăTypical Characteristics Ċ Triggering System 1Ć16.........
TableĂ1Ć21:ăTypical Characteristics Ċ Video Triggering System 1Ć17....
TableĂ1Ć22:ăTypical Characteristics Ċ ZĆAxis 1Ć17....................
TableĂ1Ć23:ăTypical Characteristics Ċ Probe Compensator 1Ć17........
TableĂ1Ć24:ăTypical Characteristics Ċ Setup Memory 1Ć17.............
TableĂ4Ć1:ăRequired Test Equipment 4Ć14...........................
TableĂ4Ć2:ăDC Gain and Delta Volts Accuracy 4Ć16...................
TableĂ4Ć3:ăDC Coupled Bandwidth 4Ć18.............................
TableĂ4Ć4:ăTime Base and Cursor Accuracies (Mag Off) 4Ć21...........
TableĂ4Ć5:ăTime Base Accuracy (Mag On) 4Ć22.......................
TableĂ4Ć6:ă500 ms Dual Delay Accuracy 4Ć24.........................
TableĂ5Ć1:ăAdjustments and Dependencies 5Ć4.....................
xii
TableĂ6Ć1:ăRelative Susceptibility to StaticĆDischarge Da age 6Ć3.....
TableĂ6Ć2:ăExternal Inspection Check List 6Ć6.......................
TableĂ6Ć3:ăTools Required for Module Re oval 6Ć11..................
TableĂ6Ć4:ăEquip ent Required for Troubleshooting 6Ć41..............
TableĂ6Ć5:ăSy pto Matrix 6Ć42...................................
TableĂ7Ć1:ăInternational Power Cords 7Ć1...........................
xiii
Please take a o ent to review these safety precautions. They are provided
for your protection and to prevent da age to the oscilloscope. This safety
infor ation applies to all operators and service personnel.
These two ter s appear in anuals:
Hstate ents identify conditions or practices that could result in
da age to the equip ent or other property.
Hstate ents identify conditions or practices that could result in
personal injury or loss of life.
These two ter s appear on equip ent:
H indicates a personal injury hazard not i ediately accessible
as one reads the arking, or a hazard to property including the equipĆ
ent itself.
H indicates a personal injury hazard i ediately accessible as
one reads the arking.
This sy bol appears in anuals:
StaticĆSensitive Devices
These sy bols appear on equip ent:
DANGER
High Voltage
Protective
ground (earth)
ter inal
ATTENTION
Refer to
anual
xiv
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xv
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xvi
xvii
Thi i the Service Manual for the TAS 465 Analog O cillo cope. Thi manuĆ
al provide you with both ervice and limited operation information.
U e the ection to learn what the TAS 465 Analog O cillo cope
can do and about the available option and acce orie .
U e the ection to learn about applying power. Thi ection al o
contain brief example of how to u e the control .
U e the ection a a reference for all nominal, warranted, and
typical characteri tic for the TAS 465 Analog O cillo cope.
U e the ! ection to help you under tand the operation of the o cilloĆ
cope to the block level.
U e the ection to verify the functionality and warĆ
ranted characteri tic of the o cillo cope.
U e the ection to bring the TAS 465 Analog O cillo cope into
conformance with the warranted characteri tic li ted in the
ection. You hould adju t the o cillo cope if indicated by the
procedure .
U e the ection to learn how to perform general maintenance
of your product. Procedure to di a emble and trouble hoot the o cilloĆ
cope are al o located in thi ection.
U e the ection for a li t of the electrical
part .
U e the ection for trouble hooting the o cillo cope. Thi ection
contain board dollie , block diagram and chematic for each board.
U e the ection for a li t of the mechaniĆ
cal part .
xviii
Other docume tatio for the TAS 465 A alog Oscilloscope i clude:
HThe Reference (Tektro ix part umber 070Ć8522ĆXX) gives you a quick
overview of how to operate your TAS 400 Series A alog Oscilloscopes.
HThe Instruction ma ual (Tektro ix part umber 070Ć8523ĆXX) co tai s
detailed operati g i formatio a d moduleĆlevel service i formatio .
HThe XYZs of Analog and Digital Oscilloscopes (Tektro ix part umber
070Ć8690ĆXX) provides you with a basic u dersta di g of oscilloscopes
a d their use.
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