Tektronix TLA 720 User manual

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Service Manual
TLA 720
Color Benchtop Chassis and
TLA 7XM
Expansion Chassis
071-0699-00
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 ©Tektronix, Inc. 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.
Tektronix, Inc., 14200 SW Karl Braun Drive, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

HARDWARE WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of one (1) year from the date of shipment. If a 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; c) to repair any damage or malfunction
caused by the use of non-Tektronix supplies; or d) 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 IN LIEU OF ANY OTHER WARRANTIES, EXPRESS 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.

SOFTWARE WARRANTY
Tektronix warrants that the media on which this software product is furnished and the encoding of the programs on the
media will be free from defects in materials and workmanship for a period of three (3) months from the date of shipment.
If a medium or encoding proves defective during the warranty period, Tektronix will provide a replacement in exchange
for the defective medium. Except as to the media on which this software product is furnished, this software product is
provided “as is” without warranty of any kind, either express or implied. Tektronix does not warrant that the functions
contained in this software product will meet Customer’s requirements or that the operation of the programs will be
uninterrupted or error-free.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period. If Tektronix is unable to provide a replacement that is free from defects in materials and workmanship
within a reasonable time thereafter, Customer may terminate the license for this software product and return this software
product and any associated materials for credit or refund.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’RESPONSIBILITY TO
REPLACE DEFECTIVE MEDIA OR REFUND CUSTOMER’S PAYMENT 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.

TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual i
Table of Contents
General Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Structure xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Conventions xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting Tektronix xiv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Interval xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Strategy for Servicing xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Offerings xvi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Benchtop Chassis Specifications 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics Tables 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expansion Chassis Specifications 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics Tables 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Information
Selecting the Correct Power Cord and Fuse 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Passive Monitor Connector 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enhanced Monitor RS-232 Connector 2–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Backplane Connectors 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enhanced Monitor 2–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Syntax 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCPI 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Syntax 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Entering Commands 2–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Groups 2–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Commands 2–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Commands 2–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Commands 2–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST Subsystem 2–67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST? 2–68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST:NUMBer? 2–69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST:RESults? 2–70. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST:RESults:VERBose? 2–71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
ii TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
IEEE 488.2 Common Commands 2–73. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*CLS 2–74. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*ESE? 2–75. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*ESR? 2–76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*IDN? 2–77. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*OPC? 2–78. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*PSC? 2–79. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*RST 2–80. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*SRE? 2–81. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*STB? 2–82. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*TST? 2–83. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*WAI 2–84. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Benchtop Chassis 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
Preparation 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventing ESD 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Cleaning 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Installation Procedures 4–3. . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tools Required 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Empty Slot Panel Fillers 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Removal and Replacement 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Blower Assembly 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Enhanced Monitor Board 4–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Power Supply 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Mainframe Cover 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Card Guides 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Nut Rails 4–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Temperature Sense Board 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the EMI DIN Shields 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Backplane 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Configuration Options 4–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jumper Settings 4–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Backplane Jumpers 4–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enhanced Monitor Board Jumpers 4–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enhanced Monitor Board Flash Jumper 4–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enhanced Monitor Board Logical Address Switch Settings 4–25. . . . . . . . . . . . . . . .
Hardware Troubleshooting 4–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Level 4–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check for Common Problems 4–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshoot the Benchtop Chassis 4–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview of Procedures 4–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mainframe Troubleshooting 4–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostics 4–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Problems 4–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Problems 4–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual iii
Check for Common Problems 4–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TLA 700 Startup Sequence 4–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Isolating System Problems 4–42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expansion Mainframe Troubleshooting 4–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repackaging Instructions 4–47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Packaging 4–47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping to the Service Center 4–47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options
Service Options 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams
Replaceable Mechanical Parts
Standard Accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index

Table of Contents
iv TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
List of Figures
Figure 1–1: Front and side view of the benchtop chassis 1–7. . . . . . . . . .
Figure 1–2: Front and side view of the expansion chassis 1–14. . . . . . . . . .
Figure 2–1: Front view of the benchtop chassis with a
benchtop controller 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: Front view of the expansion chassis 2–2. . . . . . . . . . . . . . . . .
Figure 2–3: Rear view of the benchtop chassis 2–2. . . . . . . . . . . . . . . . . . .
Figure 2–4: Rear view of the enhanced monitor 2–4. . . . . . . . . . . . . . . . .
Figure 2–5: Power cord identification chart 2–5. . . . . . . . . . . . . . . . . . . . .
Figure 2–6: Passive monitor connector 2–8. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–7: RS-232 connector pinout 2–11. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–8: Tree hierarchy 2–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–9: Command header 2–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–10: Command header with parameter 2–20. . . . . . . . . . . . . . . . .
Figure 2–11: TEST subsystem hierarchy 2–67. . . . . . . . . . . . . . . . . . . . . . .
Figure 4–1: Installing the empty slot panel fillers 4–4. . . . . . . . . . . . . . . .
Figure 4–2: Location of blower assembly screws 4–6. . . . . . . . . . . . . . . . .
Figure 4–3: Removing the blower assembly 4–7. . . . . . . . . . . . . . . . . . . . .
Figure 4–4: Removing the blower 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–5: Removing the enhanced monitor board 4–8. . . . . . . . . . . . . .
Figure 4–6: Removing the power supply 4–9. . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–7: Removing the mainframe cover 4–10. . . . . . . . . . . . . . . . . . . .
Figure 4–8: Removing the top and bottom card guides 4–12. . . . . . . . . . . .
Figure 4–9: Replacing the top and bottom nut rails 4–13. . . . . . . . . . . . . .
Figure 4–10: Removing the temperature sense board 4–14. . . . . . . . . . . . .
Figure 4–11: Removing the backplane EMI DIN shields 4–15. . . . . . . . . .
Figure 4–12: Removing the backplane 4–17. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–13: Power switch connectors 4–19. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–14: Soft power down jumper setting 4–22. . . . . . . . . . . . . . . . . . .
Figure 4–15: Enhanced monitor board jumpers 4–23. . . . . . . . . . . . . . . . .
Figure 4–16: Enhanced monitor board flash jumper 4–24. . . . . . . . . . . . .
Figure 4–17: Logical address switches 4–25. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–18: Rear-panel connector diagram 4–29. . . . . . . . . . . . . . . . . . . .
Figure 4–19: Primary troubleshooting procedure 4–31. . . . . . . . . . . . . . . .
Figure 4–20: TLA700 startup sequence 4–32. . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual v
Figure 4–21: TLA700 startup sequence 4–41. . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–22: ResMan32 program output 4–43. . . . . . . . . . . . . . . . . . . . . . .
Figure 6–1: Interconnection block diagram 6–1. . . . . . . . . . . . . . . . . . . . .
Figure 6–2: Benchtop chassis block diagram 6–2. . . . . . . . . . . . . . . . . . .
Figure 7–1: Cabinet and chassis assembly 7–7. . . . . . . . . . . . . . . . . . . . . .
Figure 7–2: Circuit boards and chassis parts 7–10. . . . . . . . . . . . . . . . . . . .
Figure 7–3: Power supply, monitor, and fan assembly 7–13. . . . . . . . . . . .
Figure 7–4: Rackmount assembly 7–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .