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. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
vi TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
List of Tables
Table 1–1: AC power source 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: Secondary power 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–3: Cooling 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–4: Certifications and compliances 1–5. . . . . . . . . . . . . . . . . . . . . .
Table 1–5: Environmental 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–6: Mechanical 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–7: AC power source 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–8: Secondary power 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–9: Cooling 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–10: Certifications and compliances 1–11. . . . . . . . . . . . . . . . . . . . .
Table 1–11: Environmental 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–12: Mechanical 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–1: Passive monitor connector pinouts 2–9. . . . . . . . . . . . . . . . . .
Table 2–2: RS-232 pin connector 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–3: P1 connector pinouts 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–4: P2 connector pinouts for slots 1 –12 2–14. . . . . . . . . . . . . . . . .
Table 2–5: P2 connector pinouts for slot 0 2–15. . . . . . . . . . . . . . . . . . . . . .
Table 2–6: Messages 2–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–7: Parameter types for syntax descriptions 2–21. . . . . . . . . . . . . .
Table 2–8: Status commands 2–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–9: System commands 2–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–10: Test commands 2–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–11: Mainframe self test 2–67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–12: IEEE 488.2 common commands 2–73. . . . . . . . . . . . . . . . . . . .
Table 4–1: Chassis backplane jumpers 4–21. . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–2: Enhanced monitor board jumpers 4–24. . . . . . . . . . . . . . . . . . .
Table 4–3: Failure symptoms and possible causes 4–28. . . . . . . . . . . . . . . .
Table 4–4: Troubleshooting overview 4–30. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–5: Failure symptoms and possible causes 4–37. . . . . . . . . . . . . . . .
Table 4–6: Command line options for ResMan32 4–42. . . . . . . . . . . . . . . .
Table 5–1: Options 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual vii
Table 7–1: Standard accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–2: Standard accessories 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
viii TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual

TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual ix
General Safety Summary
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.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
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 marking on the product. Consult the product manual for further ratings
information before making connections to the product.
The common terminal is at ground potential. Do not connect the common
terminal to elevated voltages.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate With SuspectedFailures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/DampConditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
To Avoid Fire or
Personal Injury

General Safety Summary
x TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
Terms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Terms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:
ProtectiveGround
(Earth)Terminal CAUTION Refer to Manual Double Insulated
WARNING
High Voltage
Symbols and Terms

TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual xi
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.
Disconnect Power. To avoid electric shock, disconnect the main power by means
of the power cord or, if provided, the power switch.
Use Caution When Servicing the CRT. To avoid electric shock or injury, use
extreme caution when handling the CRT. Only qualified personnel familiar with
CRT servicing procedures and precautions should remove or install the CRT.
CRTs retain hazardous voltages for long periods of time after power is turned off.
Before attempting any servicing, discharge the CRT by shorting the anode to
chassis ground. When discharging the CRT, connect the discharge path to ground
and then the anode. Rough handling may cause the CRT to implode. Do not nick
or scratch the glass or subject it to undue pressure when removing or installing it.
When handling the CRT, wear safety goggles and heavy gloves for protection.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.
To avoid electric shock, do not touch exposed connections.
X-Radiation. To avoid x-radiation exposure, do not modify or otherwise alter the
high-voltage circuitry or the CRT enclosure. X-ray emissions generated within
this product have been sufficiently shielded.

Service Safety Summary
xii TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual

TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual xiii
Preface
Read this preface to learn how this manual is structured, what conventions are
used, and where you can find other information related to servicing this product.
Read the Introduction, which follows this preface for safety and other important
background information before using this manual for servicing this product.
Manual Structure
This manual is divided into chapters, which are made up of related subordinate
topics. These topics can be cross referenced as sections.
Read the introductions to all procedures. These introductions provide important
information needed to do the service correctly, safely, and efficiently.
Manual Conventions
This manual uses certain conventions and terminology that you should become
familiar with before attempting service.
A benchtop chassis is a benchtop mainframe without a benchtop controller
installed.
A benchtop mainframe is a benchtop chassis with a benchtop controller installed.
An expansion chassis is an expansion mainframe without an expansion module
installed.
An expansion mainframe is an expansion chassis with an expansion module
installed.
Throughout this manual, the term module refers to an LA module or a DSO
module that plugs into a portable mainframe, benchtop mainframe, or expansion
mainframe. A module is composed of circuit cards, interconnecting cables, and a
user-accessible front panel.
Symbols and terms related to safety appear in the Service Safety Summary found
at the beginning of this manual.
Benchtop Chassis
Benchtop Mainframe
Expansion Chassis
Expansion Mainframe
Modules
Safety

Preface
xiv TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
This manual refers to any field-replaceable assembly or mechanical part
specifically by its name or generically as a replaceable part. In general, a
replaceable part is any circuit board or assembly that is listed in the replaceable
parts list of Chapter 10.
Contacting Tektronix
Product
Support For questions about using Tektronix measurement products, call toll free in North America:
1-800-TEK-WIDE (1-800-835-9433 ext. 2400)
6:00 a.m. –5:00 p.m. Pacific time
Or contact us by e-mail:
[email protected]
For product support outside of North America, contact your
local Tektronix distributor or sales office.
Service
Support Tektronix offers extended warranty and calibration programs as options on many products. Contact your local Tektronix
distributor or sales office.
For a listing of worldwide service centers, visit our web site.
For other
information In North America: 1-800-TEK-WIDE (1-800-835-9433)
An operator will direct your call.
To write us
Website
Tektronix, Inc.
14200 SW Karl Braun Drive
Beaverton, OR 97077
USA
Tektronix.com
Replaceable Parts

TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual xv
Introduction
This manual contains information needed to properly service the benchtop
chassis and the expansion chassis. This introduction contains information critical
to safe and effective servicing.
To prevent personal injury or damage to the benchtop chassis or expansion
chassis, consider the following requirements before attempting service:
HThe procedures in this manual should be performed only by a qualified
service person.
HRead the General Safety Summary and Service Safety Summary found at the
beginning of this manual.
HRead the Preface beginning on page xiii.
HRead Operating Information beginning on page 2–1.
When using this manual for servicing, be sure to follow all warnings, cautions,
and notes.
Adjustment Interval
There are no adjustments or certifiable parameters for the benchtop chassis or
expansion chassis.
Strategy for Servicing
This manual supports and contains all the information needed for periodic
maintenance of the benchtop chassis and expansion chassis. Examples of such
information are procedures for fault isolation of a failed circuit board or
assembly and for removal and replacement of the failed boards or assemblies.
This manual also:
HSupports isolation of faults to the failed circuit board or assembly level
shown in the replaceable parts list.
HSupports removal and replacement of those boards or assemblies.
HSupports removal and replacement of fuses, knobs, chassis, and other
mechanical parts listed in the replaceable parts list.
This manual does not support component-level fault isolation and replacement.