Tektronix TDS 460, TDS 420, TDS 410 Service Manual

Service Manual

TDS 410, 420 & 460

Digitizing Oscilloscopes

070±8036±03

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WARRANTY

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three 3 years from the date of shipment If any such product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product

In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations

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 warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product; b to repair damage resulting from improper use or connection to incompatible equipment; or c to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Table of Contents

Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xvii
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxi
Manual Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxi
Manual Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxii
Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxii
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxii
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxii
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxii
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxiii
Before Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxiii
Strategy for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxiii
Tektronix Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxiv
Warranty Repair Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxiv
Repair or Calibration Service . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxiv
Self Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xxv

Specifications

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	121
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	121
User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	121
Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1*2
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1*2
General Purpose Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1*2
GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1*2
Signal Acquisition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	122
Horizontal System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	123
Trigger System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	124
Acquisition Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	124
On2Board User Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	124
Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1*4
Autoset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1*4
Measurement Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	125
Cursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1*5
Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1*5
Digital Signal Processing DSP . . . . . . . . . . . . . . . . . . . . . . . . .	1*5
Storage and I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	125
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	126

TDS 410, TDS 420 & TDS 460 Service Manual

Zoom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	106
Nominal Traits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	107
Warranted Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1012
Performance Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1012
Typical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1018
Operating Information
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	201
Supplying Operating Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	201
Power Cord Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	202
Operating Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	202
Memory Backup Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	202
Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	204
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	204
Ventilation Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	204
Applying and Interrupting Power . . . . . . . . . . . . . . . . . . . . . . . . . .	204
Power0Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	204
Power0Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	205
Repackaging Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	206
Installed Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	206
Operating Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	207
Screen Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	207
Basic Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	207
How to Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	207
How to Use Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	208
How to Use the Status Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .	208
How to Set Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	209
How to Set Complex Functions . . . . . . . . . . . . . . . . . . . . . . . . .	2012
Theory of Operation
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	301
Logic Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	301
Module Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	301
Performance Verification
Brief Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	401
General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	401

vi

Contents

Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4/2
Self Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4/4
Verify Internal Adjustment Self Compensation and
Diagnostics	494
Functional Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4/6
Verify All Input Channels	496
Verify the Time Base	498
Verify the ain and Delayed Trigger Systems	499
Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4/13
Prerequisites	4913
Equipment Required	4913
Test Record	491
Signal Acquisition System Checks . . . . . . . . . . . . . . . . . . . . . . . .	4/18
Check Offset Accuracy	4918
Check DC Voltage easurement Accuracy Averaged	4920
Check Analog Bandwidth	4922
Check Delay atch Between Channels	4927
Time Base System Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4/31
Check Accuracy for ong9Term Sample Rate Delay
Time and Delta Time easurements	4931
Trigger System Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4/35
Check Accuracy Trigger evel or Threshold DC Coupled	493
Sensitivity Edge Trigger DC Coupled	4938
aximum Input Frequency Auxiliary Trigger	4942
Check Video Trigger Sensitivity Option 0 Equipped
odels Only	4944
Output Signal Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4/48
Check Probe Adjust Output	4948

Adjustment Procedures

Adjustment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5/1
Requirements for Performance . . . . . . . . . . . . . . . . . . . . . . . . . . .	5/1
Personnel	91
Warm9up Period	91
Access	91
System	92
Test Equipment	92
Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5/2
Performing the Adjustments	92
Complete Adjustment	93
Individual Adjustments	93
Partial Adjustment	93
Adjustment After Repair	93
Adjustment Dependencies	94

TDS 410, TDS 420 & TDS 460 Service Manual

vii

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5,5
Adjustment Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5,6
Hardware Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	576
Software Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	577
Software7Based Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . .	578
Probe Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5,9
Compensate the Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	579
Measure the Probe Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . .	5711
Adjust the Probe 8 High Frequency Response . . . . . . . . . . .	5714
Monitor Assembly Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5,20

Maintenance

Maintenance Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6,1
Procedures Not In This Section . . . . . . . . . . . . . . . . . . . . . . . . . . .	6,1
Preventing ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6,2
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	672
Susceptibility to SD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	672
Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6,5
General Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6,5
Inspection and Cleaning Procedures . . . . . . . . . . . . . . . . . . . . . .	6,5
Inspection 8 xterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	676
Cleaning Procedure 8 xterior . . . . . . . . . . . . . . . . . . . . . . . . .	676
Inspection 8 Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	677
Cleaning Procedure 8 Interior . . . . . . . . . . . . . . . . . . . . . . . . . .	678
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	678
Removal and Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . .	6,9
Preparation - Please Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6,9
List of Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6710
Cable Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6710
General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6710
Summary of Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6710
Access Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6,13
Procedures for Module Removal and Installation . . . . . . . . . . .	6,21
Front7Panel Knobs and Shafts . . . . . . . . . . . . . . . . . . . . . . . . . .	6721
Line Fuse and Line Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6723
Front Cover, Rear Cover, Cabinet, Rear MI Gasket,
and Cabinet Handle and Feet . . . . . . . . . . . . . . . . . . . . . . .	6724
Trim Ring, Menu lastomer, Menu Buttons, and Front
MI Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6728
A06 Front7Panel Assembly, SD Shield, and Menu Flex
and Probe Code Flex Circuits . . . . . . . . . . . . . . . . . . . . . . .	6731
A05 Attenuator Assembly and Shield . . . . . . . . . . . . . . . . . . . .	6734
A26 Monitor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6737

viii

Contents

A08 Jumper Board Assembly, D1 Bus, and Board Supports	6040
A03 CPU Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6041
A02 Display Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6043
A09 DSP Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6045
A01 Backplane Assembly and its Mount . . . . . . . . . . . . . . . . . .	6046
Back0up Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6049
A25 Low Voltage Power Supply and its Mount . . . . . . . . . . . .	6051
Fan and Fan Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6054
Line Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6056
A07 Auxiliary Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6058
A04 Acquisition Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6060
Main Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6062
Disassembly for Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6262
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6265
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6265
Firmware Updates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6266
Troubleshooting Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6267
Console Port Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6067

Options

Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	721
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	721
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	724
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	725

Electrical Parts List

Replaceable Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

821

Diagrams

Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 921

Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 921

Mechanical Parts List

Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1021
Parts Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1021
Using the Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . . .	1022

TDS 410, TDS 420 & TDS 460 Service Manual

ix

x

Contents

List of Illustrations

Figure 2:1:9 ower:Cord lug Identification . . . . . . . . . . . . . . . . . . . . . .	2:3
Figure 2:2:9Map of Display Functions . . . . . . . . . . . . . . . . . . . . . . . . . . .	2:8
Figure 4:1:9Map of Display Functions . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:3
Figure 4:2:9Verifying Adjustments and Signal ath Compensation . .	4:5
Figure 4:3:9Universal Test Hookup for Functional Tests . . . . . . . . . . . .	4:
Figure 4:4:9Initial Test Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:18
Figure 4:5:9Initial Test Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:20
Figure 4:6:9Initial Test Hookup TDS 410 and TDS 420 . . . . . . . . . . .	4:23
Figure 4: :9Initial Test Hookup TDS 460 . . . . . . . . . . . . . . . . . . . . . . .	4:23
Figure 4:8:9Measurement of Analog Bandwidth . . . . . . . . . . . . . . . . . .	4:26
Figure 4:9:9Initial Test Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:28
Figure 4:10:9Measurement of Channel Delay . . . . . . . . . . . . . . . . . . . .	4:30
Figure 4:11:9Initial Test Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:31
Figure 4:12:9Measurement of Accuracy ; Long:Term and
Delay:Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:33
Figure 4:13:9Initial Test Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:35
Figure 4:14:9Initial Test Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:38
Figure 4:15:9Measurement of Trigger Sensitivity . . . . . . . . . . . . . . . . . .	4:40
Figure 4:16:9Initial Test Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:42
Figure 4:1 :9Confirming Auxiliary Triggering at Maximum
Triggering Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:43
Figure 4:18:9Initial Test Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:44
Figure 4:19:9Adjusting Sync ulse Amplitude . . . . . . . . . . . . . . . . . . . .	4:45
Figure 4:20:9Measurement of Video Sensitivity . . . . . . . . . . . . . . . . . . .	4:46
Figure 4:21:9Initial Test Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4:48
Figure 4:22:9Measurement of robe Compensator Limits . . . . . . . . . .	4:49
Figure 5:1:9Hookup for robe Compensation . . . . . . . . . . . . . . . . . . . .	5:9
Figure 5:2:9 erforming robe Compensation . . . . . . . . . . . . . . . . . . . .	5:10
Figure 5:3:9 roper and Improper robe Compensation . . . . . . . . . . .	5:10
Figure 5:4:9Exposing the Inner robe Tip . . . . . . . . . . . . . . . . . . . . . . . .	5:11
Figure 5:5:9Initial Test Hookup TDS 410 and TDS 420 nly . . . . . . .	5:12
Figure 5:6:9Initial Test Hookup TDS 460 nly . . . . . . . . . . . . . . . . . . .	5:12
Figure 5: :9Exposing the robe Body . . . . . . . . . . . . . . . . . . . . . . . . . . .	5:14
Figure 5:8:9Initial Test Hookup TDS 410 and TDS 420 nly . . . . . . .	5:15
Figure 5:9:9Initial Test Hookup TDS 460 nly . . . . . . . . . . . . . . . . . . .	5:15
Figure 5:10:9 robe Test Hookup TDS 410 and TDS 420 nly . . . . .	5:1
Figure 5:11:9 robe Test Hookup TDS 460 nly . . . . . . . . . . . . . . . . .	5:1
Figure 5:12:9Locations of robe Adjustments . . . . . . . . . . . . . . . . . . . .	5:18

TDS 410, TDS 420 & TDS 460 Service Manual

xi

Figure A13:@Adjustments vs FrontACorner Response		A19
Figure A14:@Monitor Adjustment Locations		A21
Figure A1 :@Five and Ten Percent Luminance Patches		A22
Figure A16:@Composite Pattern for Focusing		A23
Figure A17:@External Graticule Limit Lines		A2
Figure 6A1:@Oscilloscope Orientation		6A11
Figure 6A2:@Cabinet and FrontAPanel Mounted Modules		6A1
Figure 6A3:@Internal Modules		6A17
Figure 6A4:@Cables and Cable Routing		6A20
Figure 6A :@Knob and Shaft Removal		6A22
Figure 6A6:@Line Fuse and Line Cord Removal		6A23
Figure 6A7:@Front Cover Rear Cover Cabinet EMI Gasket and
Cabinet Handle and Feet Removal		6A2
Figure 6A8:@Trim Ring Menu Elastomer and Menu Buttons
Removal		6A28
Figure 6A9:@EMI Gasket Removal and Installation		6A30
Figure 6A10:@A06 FrontAPanel Assembly ESD Shield and Menu
Flex and Probe Code Flex Circuits Removal		6A32
Figure 6A11:@Disassembly of the FrontAPanel Assembly		6A33
Figure 6A12:@A0 Attenuator Removal		6A3
Figure 6A13:@A26 Monitor Assembly Removal		6A39
Figure 6A14:@A08 Jumper Board Assembly D1 Bus and
Board Supports Removal		6A41
Figure 6A1 :@A03 CPU Removal		6A42
Figure 6A16:@A02 Display Assembly Removal		6A44
Figure 6A17:@A09 DSP Assembly Removal		6A46
Figure 6A18:@A01 Backplane Assembly and its Mount Removal		6A48
Figure 6A19:@Battery Removal		6A 0
Figure 6A20:@A2 Low Voltage Power Supply Removal		6A 2
Figure 6A21:@Fan and Fan Mount Removal		6A
Figure 6A22:@Line Filter Removal		6A 6
Figure 6A23:@Auxiliary Power Supply Removal		6A 9
Figure 6A24:@A04 Acquisition Board Removal		6A61
Figure 6A2 :@Accessing the Protection Switch		6A66
Figure 6A26:@Console Port Connections		6A69
Figure 6A27:@Primary Troubleshooting Procedure		6A70
Figure 6A28:@A03?CPU Board Connector P1		6A71
Figure 6A29:@Module Isolation Troubleshooting Procedure		6A72
Figure 6A30:@Low Voltage Power Supply Troubleshooting Procedure		6A74
Figure 6A31:@Power Supply Overload Troubleshooting Procedure		6A76
Figure 6A32:@A2 ?Low Voltage Power Supply Module Right Side		6A77
Figure 6A33:@Monitor Troubleshooting Procedure		6A78
Figure 6A34:@Horizontal and Vertical Sync Signals		6A79

xii

Contents

Figure 6935:8A Video Signal with White, Black, and Blanking Levels	69 9
Figure 6936:8A267Monitor Connector J440 . . . . . . . . . . . . . . . . . . . . . . .	6980
Figure 693 :8A0 7Auxiliary Power Connectors J4 and J . . . . . . . . . . .	6980
Figure 6938:8A027Display Connector J2 . . . . . . . . . . . . . . . . . . . . . . . . .	6981
Figure 6939:8Processor/Front Panel Troubleshooting Procedure . . . .	6982
Figure 6940:8A067Front Panel Board Power Connectors J101
and J106 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6983
Figure 6941:8Attenuator/Acquisition Troubleshooting Procedure . . . .	6984
Figure 6942:8A087Jumper and A057Attenuator Boards Signal
Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6985
Figure 6943:8Acquisition and Attenuator Power Troubleshooting
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6986
Figure 6944:8A047Acquisition Board Power Connector . . . . . . . . . . . .	698
Figure 6945:8Backplane Troubleshooting Procedure . . . . . . . . . . . . . .	6988
Figure 6946:8A017Backplane Module . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6990
Figure 694 :8I2C Isolation Troubleshooting Procedure . . . . . . . . . . . .	6991
Figure 6948:8Console Troubleshooting Procedure . . . . . . . . . . . . . . . .	6992
Figure 991:8TDS 400 Interconnections . . . . . . . . . . . . . . . . . . . . . . . . . .	992
Figure 992:8TDS 400 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .	994
Figure 1091:8External and Front Panel Modules . . . . . . . . . . . . . . . . . .	109
Figure 1092:8Internal Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10911
Figure 1093:8Cables and Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10913

TDS 410, TDS 420 & TDS 460 Service Manual

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xiv

Contents

List of Tables

Table=1?1:>Record Length vs Divisions per Record								1?3
Table=1?2:>Nominal Traits @ Signal Acquisition System								1?7
Table=1?3:>Nominal Traits @ Time Base System								1?8
Table=1?4:>Nominal Traits @ Triggering System								1?9
Table=1? :>Nominal Traits @ Display System								1?9
Table=1?6:>Nominal Traits @ Data Storage								1?9
Table=1?7:>Nominal Traits @ GPIB Interface Video Output and
Power Fuse								1?10
Table=1?8:>Nominal Traits @ Mechanical								1?10
Table=1?9:>Warranted Characteristics @ Signal Acquisition System								1?12
Table=1?10:>Warranted Characteristics @ Time Base System								1?14
Table=1?11:>Warranted Characteristics @ Triggering System								1?1
Table=1?12:>Warranted Characteristics @ Probe Compensator
Output								1?16
Table=1?13:>Power Requirements								1?16
Table=1?14:>Warranted Characteristics @ Environmental Safety
and Reliability								1?17
Table=1?1 :>Typical Characteristics @ Signal Acquisition System								1?18
Table=1?16:>Typical Characteristics @ Time Base System								1?19
Table=1?17:>Typical Characteristics @ Triggering System								1?19
Table=1?18:>Typical Characteristics @ Data Handling								1?20
Table=2?1:>Power Cord Conductor Identification								2?2
Table=2?2:>Effects of Corrupted Data								2?
Table=4?1:>Test Equipment								4?14
Table=4?2:>DC Offset Accuracy								4?19
Table=4?3:>Analog Bandwidth TDS 410 and TDS 420								4?2
Table=4?4:>Analog Bandwidth TDS 460								4?2
Table= ?1:>Adjustments Required for Module Replaced								?3
Table= ?2:>Adjustments and Dependencies								?4
Table= ?3:>Test Equipment Fixtures and Supplies								?
Table= ?4:>GPIB Board Configuration								?7
Table=6?1:>Relative Susceptibility to Static?Discharge Damage								6?3
Table=6?2:>External Inspection Check List								6?6
Table=6?3:>Internal Inspection Check List								6?7
Table=6?4:>Tools Required for Module Removal								6?12
Table=6? :>Access Instructions for Modules in Figure 6?2								6?14
Table=6?6:>Access Instructions for Modules in Figure 6?3								6?16
Table=6?7:>Access and Removal Instructions for Cables
in Figure 6?4								6?18

TDS 410, TDS 420 & TDS 460 Service Manual

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able6688 7 roubleshooting est Equipment, Fixtures, and upplies	6867
able6689 7 onnections for a 9 to 25 in ull odem able . . . . . . .	6868
able66810 7Diagnostic Failure riority ist . . . . . . . . . . . . . . . . . . . . . .	6873
able66811 7 ormal utput Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6875
able66812 7 ower upply aximum urrent . . . . . . . . . . . . . . . . . . . .	6877
able66813 7Front anel onnector Voltages . . . . . . . . . . . . . . . . . . . .	6883
able66814 7 hannel and 1 ignal ocations . . . . . . . . . . . . . . . . . . .	6885
able66815 7 056 ttenuator oard ower . . . . . . . . . . . . . . . . . . . . . . .	6886
able66816 7 046 cquisition oard ower . . . . . . . . . . . . . . . . . . . . . . .	6886
able66817 7 egulator Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6889
able66818 7J7 Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6889
able66819 7J8 Front anel Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6889
able6781 7International ower ords . . . . . . . . . . . . . . . . . . . . . . . . . . .	782
able6782 7 tandard ccessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	784
able6783 7 robe ccessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	784
able6784 7 ptional ccessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	785
able6785 7 robe ccessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	786
able6786 7 ccessory oftware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	787

xvi

Contents

Service Safety Summary

Please take a moment to review these safety precautions They are provided for your protection and to prevent damage to the digitizing oscilloscope This safety information applies to all operators and service personnel

Symbols and Terms These two terms appear in manuals:

H statements identify conditions or practices that could result in damage to the equipment or other property

H statements identify conditions or practices that could result in personal injury or loss of life

These two terms appear on equipment:

HT indicates a personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equipment itself

HR indicates a personal injury hazard immediately accessible as one reads the marking

This symbol appears in manuals:

Static-Sensitive Devices

These symbols appear on equipment:

DANGER	Protective	ATTENTION
High Voltage	ground earth	Refer to
	terminal	manual

TDS 410, TDS 420 & TDS 460 Service Manual

xvii

Specific Precautions Observe all of the following precautions to ensure your personal safety and to prevent damage to either the digitizing oscilloscope or the equipment

connected to it.

Do Not Perform Service While Alone

Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present.

Use Care When Servicing With Power On

Dangerous voltages exist at several points in this product. To avoid personal injury, do not touch exposed connections or components while power is on. Disconnect power before removing protective panels, soldering, or replacing components.

Power Source

The digitizing oscilloscope is intended to operate from a power source that will not apply more than 250 VRMS between the supply conductors or be+ tween either supply conductor and ground. A protective ground connection, through the grounding conductor in the power cord, is essential for safe system operation.

Grounding the Digitizing Oscilloscope

The digitizing oscilloscope is grounded through the power cord. To avoid electric shock, plug the power cord into a properly wired receptacle where earth ground has been verified by a qualified service person. Do this before making connections to the input or output terminals of the digitizing oscillo+ scope.

Without the protective ground connection, all parts of the digitizing oscillo+ scope are potential shock hazards. This includes knobs and controls that may appear to be insulators.

Use the Proper Power Cord

Use only the power cord and connector specified for your product. Use only a power cord that is in good condition.

Use the Proper Fuse

To avoid fire hazard, use only the fuse specified in the parts list for your product, and which is identical in type, voltage rating, and current rating.

xviii

Service Safety Summary

Do Not Remove Covers or Panels

To avoid personal injury, do not operate the digitizing oscilloscope without the panels or covers.

Do Not Operate in Explosive Atmospheres

The digitizing oscilloscope provides no explosion protection from static discharges or arcing components. Do not operate the digitizing oscilloscope in an atmosphere of explosive gasses.

Electric Overload

Never apply a voltage to a connector on the digitizing oscilloscope that is outside the range specified for that connector.

TDS 410, TDS 420 & TDS 460 Service Manual

xix

xx	Service Safety Summary

Preface

This service manual provides service information for the TDS 410, TDS 420, and TDS 460 Digitizing Oscilloscopes.

If servicing a TDS 410, follow the procedures for the TDS 420, but ignore all references to CH 3 and CH 4.

Manual Structure	This manual is divided into sections, such as Specifications and Theory of
	Operation. Further, it is divided into subsections, such as Product Descrip$
	tion and Removal and Installation Procedures.
	Sections containing procedures also contain introductions to those proce,
	dures. Be sure to read these introductions, because they provide informa,
	tion needed to do the service correctly and efficiently. The following is a brief
	description of each manual section.
	H Specifications - contains a product description of the digitizing oscillo,
	scope and tables of the characteristics and descriptions that apply to it.
	H Operating Information - is this section. It includes a description of how
	this manual is structured, as well as general information and operating
	instructions at the level needed to safely power up and service this
	oscilloscope. A statement of the service strategy that this manual sup,
	ports, as well as instructions for shipment of the digitizing oscilloscope,
	are found in this section.
	H Theory of Operation - contains circuit descriptions that support general
	service and fault isolation.
	H Performance Verification - contains a collection of procedures for
	confirming that this digitizing oscilloscope functions properly and meets
	warranted limits.
	H Adjustment Procedures - contains a collection of procedures for adjust,
	ing this digitizing oscilloscope to meet warranted limits.
	H Maintenance - contains information and procedures for doing preven,
	tive and corrective maintenance of the digitizing oscilloscope. Instruc,
	tions for cleaning, for module removal and installation, and for fault
	isolation to a module are found here.
	H Options - contains information on servicing any of the factory,installed
	options that may be present in your oscilloscope.
	H Electrical Parts List - contains a statement referring you to the Mechani$
	cal Parts List, where both electrical and mechanical modules are listed.
	See below.
	H Diagrams - contains a block diagram and an interconnection diagram
	useful for isolating failed modules.

TDS 410, TDS 420 & TDS 460 Service Manual

xxi

HMechanical Parts List 0 includes a table of all replaceable modules, their descriptions, and their Tektronix part numbers.

Manual Conventions This manual uses certain conventions which you should become familiar with before doing service.

Modules

Throughout this manual, any replaceable component, assembly, or part of this digitizing oscilloscope is referred to generically as a module. In general, a module is an assembly, like a circuit board, rather than a component, like a resistor or an integrated circuit. Sometimes a single component is a mod/ ule; for example, the chassis of the oscilloscope is a module.

Safety

Symbols and terms related to safety appear in the Safety Summary found at the beginning of this manual.

Related Manuals

Symbols

Besides the symbols related to safety, this manual uses the following sym/ bols:

The •stop sign" icon labels information which must be read in order to correctly do service and to avoid incorrectly using or applying service procedures.

The clock icon labels procedure steps which require a pause to wait for the oscilloscope to complete some operation before you can continue.

Various icons such as the example icon at the left are used in proce/ dures to help identify certain readouts and menu functions on screen.

These other manuals are available for the TDS 410, TDS 420, and TDS 460 Digitizing Oscilloscopes.

HThe Reference gives you a quick overview of how to operate your oscil/ loscope.

HThe User provides instructions on how to operate your oscilloscope.

HThe Programmer Manual provides complete information on program/ ming and remote control of the oscilloscope through the GPIB.

xxii

Preface

Before Servicing

Strategy for

Servicing

Introduction

This section contains general information critical to safe and effective servic6 ing of this oscilloscope, the manual service strategy, and a description of repair and warranty services available from Tektronix.

This manual is for servicing the TDS 4 , TDS 42 , & TDS 46 Digitizing Oscilloscopes. To prevent injury to yourself or damage to the oscilloscope, do the following before you attempt service:

He sure you are a qualified service person;

HRead the Safety Summary found at the beginning of this manual;

HRead Strategy for Servicing and Supplying Operating Power in this section.

When using this manual for servicing, be sure to heed all warnings, cau6 tions, and notes.

If servicing a TDS 4 , follow the procedures for the TDS 42 , but ignore all references to H 3 and H 4.

Throughout this manual, any field6replaceable component, assem6 bly, or part of this oscilloscope is referred to generically as a module.

This manual contains all the information needed for periodic maintenance of your oscilloscope. (Examples of such information are procedures for check6 ing performance and for readjustment.) Further, it contains all information for corrective maintenance down to the module level. This means that the procedures, diagrams, and other troubleshooting aids help isolate failures to a specific module, rather than to components of that module. Once a failure is isolated, replace the module with a fully tested module obtained from the factory.

ll modules are listed in Section , Mechanical Parts List. To isolate a failure to a module, use the fault isolation procedures found in Section 6, Mainte nance. To remove and replace any failed module, follow the instructions in

Removal and Installation Procedures, also found in Section 6.

TDS 410, TDS 420 & TDS 460 Service Manual

xxiii

Tektronix Service

Tektronix provides service to cover repair under warranty as well as other services that may provide a cost5effective answer to your service needs.

Whether providing warranty repair service or any of the other services listed below, Tektronix service technicians, trained on Tektronix products, are best equipped to service your digitizing oscilloscope. Tektronix technicians are appraised of the latest information on improvements to the product as well as the latest new options to the product.

Warranty Repair Service

Tektronix warrants this product for three years from date of purchase, ex5 cluding probes for which the warranty is one year. (The warranty appears on the back of the title page in this manual.) Tektronix technicians provide warranty service at most Tektronix service locations worldwide. Your Tektro5 nix product catalog lists all service locations worldwide.

Repair or Calibration Service

The following services may be purchased to tailor repair and/or calibration of your digitizing oscilloscope to fit your requirements.

Option 9C 6 When you order your digitizing oscilloscope with option 9C, it is shipped with a Certificate of Calibration and Test Data. This certificate provides traceability to the National Institute of Standards and Technology (NIST). It certifies procedures used to calibrate the oscilloscope comply with U. S. Military Standard 4 662 .

At Depot Service 6 Tektronix offers several standard5priced adjustment (calibration) and repair services

Hsingle repair and/or adjustment.

HCalibrations using equipment and procedures that meet the traceability standards specific to the local area.

Hnnual maintenance agreements that provide for either calibration and repair or calibration only of the oscilloscope.

Of these services, the annual maintenance agreement offers a particularly cost5effective approach to service for many owners of the TDS 420 & TDS 460 Digitizing Oscilloscopes. Such agreements can be purchased to span several years.

On Site Service 6 The annual maintenance agreement can be purchased with on5site service, with repair and calibration done at your facility. This service reduces the time your oscilloscope is out of service when calibration or repair is required.

xxiv	Introduction

Self Service

Tektronix supports repair to the module level by providing Module Exchange and Module Repair and Return.

Module Exchange ) This service reduces down time for repair by allow( ing you to exchange most modules for remanufactured ones. Tektronix ships you an updated and tested exchange module from the Beaverton, Oregon service center, typically within 24 hours. Each module comes with a 90(day service warranty.

Module Repair and Return ) This service returns to you within 10 days the same module that you shipped to Tektronix. The module shipped is repaired, tested, and returned to you from the Beaverton, Oregon service center. It is not updated to match current modules of the same type. Again, each module comes with a 90(day service warranty.

For More Information ) Contact your local Tektronix service center or sales engineer for more information on any of the repair or adjustment services just described.

TDS 410, TDS 420 & TDS 460 Service Manual

xx

xxvi	Introduction

General

User Interface

Product Description

This subsection begins with a general description of the traits of the TDS 4 Digitizing Oscilloscopes Three subsections follow one for each of three classes of traits: nominal traits, warranted characteristics, and typical characteristics

Tektronix TDS 4 Digitizing Oscilloscopes are portable instruments suitable for use in a variety of test and measurement applications and systems Key features include:

HFour input channels on the TDS 42 and TDS 46 two input channels on the TDS 4 each with a record length of 5 to 5 points and 8:bit vertical resolution Option extends the maximum record length to 6 points

HSimultaneous acquisition of waveforms in all channels at the maximum digitizing rate of egasamples second All channels acquire at the full analog bandwidth of 5 Hz TDS 4 and TDS 42 or 35 HzTDS 46 and all have the same features

HVideo triggering capabilities with Option 5 Video Trigger

HFull programmability and printer plotter output

HAdvanced functions such as continuously updated measurements

HSpecialized display modes such as infinite and variable persistence

HA unique graphical user interface GUI an on:board help mode and a logical front:panel layout which combine to deliver a new standard in usability

HAdvanced waveform math with Option 2F Advanced DSP ath om: pute and display the integral of a waveform the differential of a wave: form and the FFT Fast Fourier Transform of a waveform

This digitizing oscilloscope uses a combination of front:panel buttons knobs and on:screen menus to control its many functions The front:panel controls are grouped according to function: vertical horizontal trigger and special Within each group any function likely to get adjusted often such as vertical positioning or the time base setting is set directly by its own front: panel knob

TDS 410, TDS 420 & TDS 460 Service Manual

1 1

Product Description

Menus

Those functions for which control settings are usually changed less often such as vertical coupling and horizontal mode are set indirectly That is pressing one sometimes two front1panel button such as vertical menu displays a menu of functions at the bottom of the screen that are related to that button For the button vertical menu the menu displayed contains functions such as coupling and bandwidth Using the buttons below this main menu to select a function such as coupling displays a side menu of settings for that function such as AC DC or GND ground coupling at the right side of the screen Use the buttons to the right of the menu to select a setting such as DC

Indicators

Several on1screen readouts help you keep track of the settings for various functions such as vertical and horizontal scale and trigger level There are also readouts to display the results of measurements made using cursors or using the automatic parameter extraction feature called measure and readouts to display the status of the instrument

General Purpose Knob

Menus can also be used to assign the general purpose knob to adjust a selected parameter function The method employed is the same as for selecting a function except the final selection in the side menu causes the general purpose knob to adjust some function such as the position of measurement cursors on screen or the setting for the fine gain of a channel

GUI

The user interface also makes use of a GUI or Graphical User Interface to make setting functions and interpreting the display more intuitive Some menus and status are displayed using iconic representations of function settings such as those shown here for full 100 MHz and 20 MHz band1 width Such icons allow you to more readily determine status or the available settings

	Signal Acquisition	The signal acquisition system provides vertical channels with calibrated
	System	vertical scale factors from 1 mV to 10 V per division All input channels can
		be acquired simultaneously
		You can display vertically position and offset each input channel You can
		also limit their bandwidth to either 100 MHz or 20 MHz specify their vertical
		coupling and adjust their fine gain

1 2	Specifications

Product Description

Besides the input channels up to three math waveforms and four reference waveforms are available for display A math waveform results when you specify operations such as add or invert; a reference waveform results when you save a live waveform in a reference memory

Horizontal System	There are three horizontal display modes: main only main intensified and
	delayed only You can select among various horizontal record length settings
	see Table+1,1
	Table2141:3Record Length vs. Divisions per Record
	Record Length1, 2	Divisions per Record
		(50 Points/Division)
	60 000	1200 divs
	30 000	600 divs
	15 000	300 divs
	5 000	100 divs
	2 500	50 divs
	1 000	20 divs
	500	10 divs

1The 30,000 and 60,000 point record lengths are available only with Option 1M.

2The maximum record length of 60,000 points for oscilloscopes equipped with Option 1M reduces to 15,000 points when operating in Hi Res or Average acquisition mode.

Both the delayed only display and the intensified zone on the main intensi, fied display can be delayed by time with respect to the main trigger Both can be set to display immediately after the delay delayed runs after main mode ; the delayed display can also be set to display at the first valid trigger after the delay delayed triggerable mode

The delayed display or the intensified zone can also be delayed by a selected number of events In such a case the events source is the delayed trigger source For any events signal the delayed,trigger system conditions the signal by determining the source coupling etc of that signal

At time base settings of 20 ms per division or slower the records are dis, played using Roll mode Both untriggered roll and triggered roll modes are available

TDS 410, TDS 420 & TDS 460 Service Manual

1 3