Tektronix TDS2022C Use and care manual

xx
TDS2000C Series
Digital Storage Oscilloscopes
ZZZ
Service Manual
*P077044600*
077-0446-00

TDS2000C Series
Digital Storage Oscilloscopes
ZZZ
Service Manual
xx
This document applies to firmware version 1.00 and above.
Warning
The servicing instructions are for use by qualified personnel
only. To avoid personal injury, do not perform any servicing
unless you are qualified to do so. Refer to all safety summaries
prior to performing service.
www.tektronix.com
077-0446-00

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries
or suppliers, and are protected by national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication
supersedes that in all previously published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
OpenChoice is a registered trademark of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find contacts in your area.

Table of Contents
General Safety Summary ......................................................................................... vi
Service Safety Summary......................................................................................... viii
Preface.............................................................................................................. ix
Manual Conventions.......................................................................................... ix
Related Documentation ...................................................................................... ix
Specifications
Specifications ..................................................................................................... 1-1
Signal Acquisition System Characteristics......... ........................ ........................ ....... 1-1
Time Base System ........................................................................................... 1-5
Triggering System ........................................................................................... 1-7
Display Specifications..................................................................................... 1-11
Interfaces and Output Ports Specifications.............................................................. 1-12
Data Handling Characteristics............................................................................ 1-12
Power Distribution System ............................................................................... 1-12
Mechanical Characteristics ............................................................................... 1-13
Environmental Performance.............................................................................. 1-13
Data Logging System Characteristics ................................................................... 1-14
Limit Testing System Characteristics.................................................................... 1-14
WheretoFindOperatingInformation
Where to Find Operating Information.......................................................................... 2-1
Theory of Operation
Theory of Operation.............................................................................................. 3-1
System Level Block Diagrams ............................................................................. 3-2
Main Board................................................................................................... 3-4
Acquisition System ................ .................. ...................... .................. ........... 3-4
Processing and Display System ....................................................................... 3-5
Input Signal Interface................................................................................... 3-5
Probe Compensation.................................................................................... 3-5
External Trigger......................................................................................... 3-5
Main Board Power...................................................................................... 3-5
Power Supply................................................................................................. 3-6
Display Module .............................................................................................. 3-6
Front Panel ................................................................................................... 3-6
Two-Channel Oscilloscopes .............. .......................... .......... ......................... 3-6
TDS2000C Series Oscilloscope Service Manual i

Table of Contents
Four-Channel Oscilloscopes ........ .................. .................. ...................... ......... 3-6
Performance Verification
Performance Verification ........................................................................................ 4-1
Required Equipment......................................................................................... 4-1
Test Record................................................................................................... 4-2
Performance Verification Procedures...................................................................... 4-3
Self Test.................................................................................................. 4-3
Self Calibration.......................................................................................... 4-3
Check DC Gain Accuracy.............................................................................. 4-3
Check Bandwidth ....................................................................................... 4-5
Check Sample Rate Accuracy and Delay Time Accuracy.......................................... 4-6
Check Edge Trigger Sensitivity ....................................................................... 4-7
Check External Edge Trigger Sensitivity............................................................. 4-9
Check Vertical Position Accuracy.............. .................. .................. ................. 4-10
Adjustment Procedures
Adjustment Procedures .......................................................................................... 5-1
Required Equipment......................................................................................... 5-1
Adjustment Procedure....................................................................................... 5-2
Enable the Service Menu............................................................................... 5-2
Adjustment Procedure.................................................................................. 5-4
Maintenance....................................................................................................... 6-1
Preventing ESD.............................................................................................. 6-1
Inspection and Cleaning..................................................................................... 6-1
General Care............................................................................................. 6-2
Interior Cleaning........................................................................................ 6-2
Exterior Cleaning ....................................................................................... 6-2
Exterior Inspection...................................................................................... 6-3
Interior Inspection ...................................................................................... 6-3
Cleaning Procedure, Interior........................................................................... 6-4
Removal and Installation Procedures...................................................................... 6-6
Summary of Procedures................................................................................ 6-6
Required Tools .......................................................................................... 6-8
Rear Feet................................................................................................. 6-8
Flip Feet.................................................................................................. 6-9
Front-Panel Knobs...................................................................................... 6-9
Power Button............................................................................................ 6-9
Rear Case .............................................................................................. 6-10
Front Feet .............................................................................................. 6-11
ii TDS2000C Series Oscilloscope Service Manual

Table of Contents
Power Supply Module................................................................................ 6-12
Internal Assembly..................................................................................... 6-13
Display Adapter Module............................................................................. 6-14
Front-Panel Cable..................................................................................... 6-17
Main Board Module .................................................................................. 6-18
Display Module ....................................................................................... 6-20
Front-Panel Module................................................................................... 6-21
Keypad ................................................................................................. 6-22
Troubleshooting............................................................................................ 6-23
Adjustment After Repair............................................................................. 6-23
Required Tools and Equipment...................................................................... 6-23
Troubleshooting Tree................................................................................. 6-23
Probe Comp Output................................................................................... 6-28
Troubleshooting the Power Supply ................................................................. 6-29
Troubleshooting the Display......................................................................... 6-30
Troubleshooting the Backlight ...................................................................... 6-32
Troubleshooting the Front Panel .................................................................... 6-34
Troubleshooting the Main Board.................................................................... 6-37
Repackaging Instructions ................................................................................. 6-40
Diagrams .......................................................................................................... 7-1
Replaceable Parts
Replaceable Parts................................................................................................. 8-1
Parts Ordering Information ................................................................................. 8-1
Using the Replaceable Parts List........................................................................... 8-2
Parts Lists and Exploded Views............................................................................ 8-3
Appendix A: Example of a Vertical Position Accuracy Test Spreadsheet................................. A-1
Example Filled-In Vertical Position Accuracy Test Spreadsheet .................................. .... A-1
TDS2000C Series Oscilloscope Service Manual iii

Table of Contents
List of Figures
Figure 3-1: Module-level block diagram (2-channel)........................................................ 3-2
Figure 3-2: Module-level block diagram (4-channel)........................................................ 3-3
Figure 4-1: Example of a line graph for the Vertical Position Accuracy test ..... .......... ............. 4-13
Figure 5-1: Adjustment setups.................................................................................. 5-3
Figure 6-1: Locator for trim and cabinet removal (4-channel model shown).............................. 6-7
Figure 6-2: Locator for internal modules (4-channel model shown) ....................................... 6-7
Figure 6-3: Display Adapter board connections ............................................................ 6-14
Figure 6-4: Connecting the Display cable ................................................................... 6-15
Figure 6-5: Oscilloscope troubleshooting tree (page 1 of 4)........ ................................ ....... 6-24
Figure 6-6: Oscilloscope troubleshooting tree (page 2 of 4)........ ................................ ....... 6-25
Figure 6-7: Oscilloscope troubleshooting tree (page 3 of 4)........ ................................ ....... 6-26
Figure 6-8: Oscilloscope troubleshooting tree (page 4 of 4)........ ................................ ....... 6-27
Figure 6-9: Measuring the backlight voltage................................................................ 6-33
Figure 7-1: TDS2000C series block diagram ................................................................. 7-2
Figure 8-1: Exploded diagram, 2-channel models............................................................ 8-4
Figure 8-2: Exploded diagram, 4-channel models............................................................ 8-6
Figure 8-3: Power supply module, cables, and wires (2-ch model shown, with 4-ch model in circle) . 8-8
Figure 8-4: Exploded diagram, back case and trim......................................................... 8-10
iv TDS2000C Series Oscilloscope Service Manual

Table of Contents
List of Tables
Table 1-1: Signal acquisition system characteristics ........................ .................. ............... 1-1
Table 1-2: Time base system.................................................................................... 1-5
Table 1-3: Triggering system.................................................................................... 1-7
Table 1-4: Display specifications ............................................................................. 1-11
Table 1-5: Interfaces and output ports specifications....................................................... 1-12
Table 1-6: Data handling characteristics..................................................................... 1-12
Table 1-7: Power distribution system ........................................................................ 1-12
Table 1-8: Mechanical characteristics........................................................................ 1-13
Table 1-9: Environmental performance...................................................................... 1-13
Table 1-10: Data logging system characteristics............................................................ 1-14
Table 1-11: Limit testing system characteristics ............................................................ 1-14
Table 4-1: Performance verification............................................................................ 4-1
Table 4-2: Test record............................................................................................ 4-2
Table 5-1: Required equipment................................................................................. 5-1
Table 5-2: Adjustment steps..................................................................................... 5-5
Table 6-1: External inspection checklist ...................................................................... 6-3
Table 6-2: Internal inspection checklist ....................................................................... 6-4
Table 6-3: Tools and equipment .............................................................................. 6-23
Table 6-4: Probe Comp output................................................................................ 6-28
Table 6-5: Troubleshooting the power supply............................................................... 6-29
Table 6-6: Troubleshooting the display ...................................................................... 6-30
Table 6-7: Troubleshooting the front panel – service....................................................... 6-34
Table 6-8: Troubleshooting the front panel – Service Diag................................................ 6-34
Table 6-9: Troubleshooting the front panel – Mfg. test.................................................... 6-34
Table 6-10: Expected signals at J202......................................................................... 6-35
Table 6-11: Troubleshooting the Main board................................................................ 6-37
Table 6-12: List of error codes................................................................................ 6-38
Table 8-1: Replaceable parts list................................................................................ 8-2
Table 8-2: Replaceable parts list, 2-channel models.......................................................... 8-3
Table 8-3: Replaceable parts list, 4-channel models.......................................................... 8-5
Table 8-4: Replaceable parts list, power supply module, cables, and wires ............................... 8-7
Table 8-5: Replaceable parts list, back case and trim ........................................................ 8-9
Table A-1: Vertical position accuracy test spreadsheet.... ........................ .......... ................ A-1
TDS2000C Series Oscilloscope Service Manual v

General Safety Summary
General SafetySummary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
To avoid potential hazards, use this product only as specified.
Only qualified personnel should perform service procedures.
To Avoid Fire or Personal
Injury
Use proper power cord. Use only the power cord specified for this product and
certified for the country of use.
Connect and disconnect properly. Connect the probe output to the measurement
instrument before connecting the probe to the circuit under test. Connect the
probe reference lead to the circuit under test before connecting the probe input.
Disconnect the probe input and the probe reference lead from the circuit under test
before disconnecting the probe from the measurement instrument.
Ground the product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe all terminal ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Connect the probe reference lead to earth ground only.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum ratingofthatterminal.
Power disconnect. The power switch disconnects the product from the power
source. See instructions for the location. Do not block the power switch; it must
remain accessible to the user at all times.
Do not operate without covers. Do not operate this product with covers or panels
removed.
Do not operate with suspected failures. If you suspect that there is damage to this
product, have it inspected by qualified service personnel.
Avoid exposed circuitry. Do not touch exposed connections and components when
power is present.
vi TDS2000C Series Oscilloscope Service Manual