Tektronix TDS 410A User manual

Service Manual
TDS 410A, TDS 420A & TDS 460A
Digitizing Oscilloscopes
070-9217-01
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 the Safety Summary prior to
performing service.

Copyright Tektronix, Inc. 1995. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
KlipChip is a trademark of Tektronix, Inc.

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.

TDS 410A, TDS 420A & TDS 460A Service Manual i
Table of Contents
General Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Servicing xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Strategy for Servicing xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tektronix Service xviii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nominal Traits 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranted Characteristics 1–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Characteristics 1–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Information
Installation 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supplying Operating Power 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Environment 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applying and Interrupting Power 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repackaging Instructions 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installed Options 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Information 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screen Layout 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Procedures 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Logic Conventions 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Overview 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification
Performance Verification Procedures 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brief Procedures 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self Tests 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Tests 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Tests 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prerequisites 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Required 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Record 4–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Acquisition System Checks 4–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Base System Checks 4–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trigger System Checks 4–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Signal Check 4–53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
ii TDS 410A, TDS 420A & TDS 460A Service Manual
Sine Wave Generator Leveling Procedure 4–55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedures
Requirements for Performance 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Usage 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Required 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Instructions 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Adjustment 5–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Monitor Assembly Adjustment 5–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
Related Maintenance Procedures 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Cleaning 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Installation Procedures 6–9. . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation — Please Read 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Access Procedure 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Procedures for Module Removal and Installation 6–23. . . . . . . . . . . . . . . . . . . . . . . .
Disassembly for Cleaning 6–65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 6–69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostics 6–69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firmware Updates 6–70. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Equipment 6–71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options
Options and Accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Parts List
Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams
Diagrams 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Parts List
Replaceable Parts 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
TDS 410A, TDS 420A & TDS 460A Service Manual iii
List of Figures
Figure 1–1: TDS 400A Dimensional Drawing 1–15. . . . . . . . . . . . . . . . . . . .
Figure 2–1: Map of Display Functions 2–8. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–1: Map of Display Functions 4–3. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–2: Verifying Adjustments and Signal Path Compensation 4–6.
Figure 4–3: Universal Test Hookup for Functional Tests 4–8. . . . . . . . . .
Figure 4–4: Initial Test Hookup 4–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–5: Initial Test Hookup 4–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–6: Initial Test Hookup 4–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–7: Measurement of Analog Bandwidth 4–29. . . . . . . . . . . . . . . . .
Figure 4–8: Initial Test Hookup 4–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–9: Measurement of Channel Delay 4–33. . . . . . . . . . . . . . . . . . . .
Figure 4–10: Initial Test Hookup 4–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–11: Measurement of Accuracy — Long-Term and
Delay-Time 4–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–12: Initial Test Hookup 4–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–13: Initial Test Hookup 4–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–14: Measurement of Trigger Sensitivity 4–43. . . . . . . . . . . . . . . .
Figure 4–15: Initial Test Hookup 4–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–16: Confirming Auxiliary Triggering at Maximum
Triggering Frequency 4–46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–17: Initial Test Hookup 4–47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–18:Adjusting Sync Pulse Amplitude 4–49. . . . . . . . . . . . . . . . . . .
Figure 4–19: Measurement of Video Sensitivity 4–50. . . . . . . . . . . . . . . . . .
Figure 4–20: Initial Test Hookup 4–52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–21: Initial Test Hookup 4–54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–22: Measurement of Probe Compensator Limits 4–55. . . . . . . . .
Figure 4–23: Sine Wave Generator Leveling Equipment Setup 4–56. . . . .
Figure 4–24: Equipment Setup for maximum Amplitude 4–57. . . . . . . . . .
Figure 5–1: Hookup for Probe Compensation 5–10. . . . . . . . . . . . . . . . . . .
Figure 5–2: Performing Probe Compensation 5–11. . . . . . . . . . . . . . . . . . .
Figure 5–3: Proper and Improper Probe Compensation 5–12. . . . . . . . . . .
Figure 5–4: Exposing the Inner Probe Tip 5–13. . . . . . . . . . . . . . . . . . . . . .
Figure 5–5: Initial Test Hookup 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
iv TDS 410A, TDS 420A & TDS 460A Service Manual
Figure 5–6: Exposing the Probe Body 5–16. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–7: Initial Test Hookup 5–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–8: Probe Test Hookup 5–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–9: Locations of Probe Adjustments 5–19. . . . . . . . . . . . . . . . . . . .
Figure 5–10:Adjustments vs. Front-Corner Response 5–20. . . . . . . . . . . .
Figure 5–11: Monitor Adjustment Locations 5–23. . . . . . . . . . . . . . . . . . . .
Figure 5–12: Five and Ten Percent Luminance Patches 5–24. . . . . . . . . . .
Figure 5–13: Composite Pattern for Focusing 5–25. . . . . . . . . . . . . . . . . . .
Figure 6–1: Oscilloscope Orientation 6–11. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–2: Cabinet and Front-Panel Mounted Modules 6–16. . . . . . . . . .
Figure 6–3: Internal Modules 6–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–4: Cables and Cable Routing 6–22. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–5: Knob and Shaft Removal 6–24. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–6: Line Fuse and Line Cord Removal 6–25. . . . . . . . . . . . . . . . . .
Figure 6–7: Front Cover, Rear Cover, Cabinet, EMI Gasket,
and Cabinet Handle and Feet Removal 6–27. . . . . . . . . . . . . . . . . . . . .
Figure 6–8: Trim Ring, Menu Elastomer,
and Menu Buttons Removal 6–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–9: EMI Gasket Removal and Installation 6–32. . . . . . . . . . . . . . .
Figure 6–10: Disk Drive Removal 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–11: A06 Front-Panel Assembly, ESD Shield, and Menu Flex
and Probe Code Flex Circuits Removal 6–35. . . . . . . . . . . . . . . . . . . . .
Figure 6–12: Disassembly of the Front-Panel Assembly 6–36. . . . . . . . . . .
Figure 6–13:A05 Attenuator Removal 6–39. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–14:A26 Monitor Assembly Removal 6–42. . . . . . . . . . . . . . . . . . .
Figure 6–15:A08 Jumper Board Assembly, D1 Bus,
and Board Supports Removal 6–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–16:A03 CPU Removal 6–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–17:A02 Display Assembly Removal 6–47. . . . . . . . . . . . . . . . . . .
Figure 6–18:A09 DSP Assembly Removal 6–48. . . . . . . . . . . . . . . . . . . . . .
Figure 6–19:A01 Backplane Assembly and its Mount Removal 6–50. . . .
Figure 6–20: Battery Removal 6–53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–21:A25 Low Voltage Power Supply Removal 6–55. . . . . . . . . . .
Figure 6–22: Fan and Fan Mount Removal 6–58. . . . . . . . . . . . . . . . . . . . .
Figure 6–23: Line Filter Removal 6–59. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–24:Auxiliary Power Supply Removal 6–62. . . . . . . . . . . . . . . . . .
Figure 6–25:A04 Acquisition Board Removal 6–64. . . . . . . . . . . . . . . . . . .
Figure 6–26:Accessing the Protection Switch 6–70. . . . . . . . . . . . . . . . . . .

Table of Contents
TDS 410A, TDS 420A & TDS 460A Service Manual v
Figure 6–27: Console Port Connections 6–73. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–28: Primary Troubleshooting Procedure 6–74. . . . . . . . . . . . . . .
Figure 6–29:A03 CPU Board Connector P1 6–75. . . . . . . . . . . . . . . . . . . .
Figure 6–30: Module Isolation Troubleshooting Procedure 6–76. . . . . . . .
Figure 6–31: Low Voltage Power Supply Troubleshooting Procedure 6–78
Figure 6–32: Power Supply Overload Troubleshooting Procedure 6–80. .
Figure 6–33:A25 Low Voltage Power Supply Module (Right Side) 6–81. .
Figure 6–34: Monitor Troubleshooting Procedure 6–82. . . . . . . . . . . . . . . .
Figure 6–35: Horizontal and Vertical Sync Signals 6–83. . . . . . . . . . . . . . .
Figure 6–36:A Video Signal with White, Black, and Blanking Levels 6–83
Figure 6–37:A26 Monitor Connector J440 6–84. . . . . . . . . . . . . . . . . . . . . .
Figure 6–38:A07 Auxiliary Power Connectors J4 and J7 6–84. . . . . . . . . .
Figure 6–39:A02 Display Connector J2 6–85. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–40: Processor/Front Panel Troubleshooting Procedure 6–86. . . .
Figure 6–41:A06 Front Panel Board Power Connectors
J101 and J106 6–87. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–42:Attenuator/Acquisition Troubleshooting Procedure 6–88. . .
Figure 6–43:A08 Jumper and A05 Attenuator Boards
Signal Locations 6–89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–44:Acquisition and Attenuator Power
Troubleshooting Procedure 6–90. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–45:A04 Acquisition Board Power Connector 6–91. . . . . . . . . . . .
Figure 6–46: Backplane Troubleshooting Procedure 6–92. . . . . . . . . . . . . .
Figure 6–47:A01 Backplane Module 6–94. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–48: I2C Isolation Troubleshooting Procedure 6–95. . . . . . . . . . . .
Figure 6–49: Console Troubleshooting Procedure 6–96. . . . . . . . . . . . . . . .
Figure 9–1: TDS 400A Interconnections 9–2. . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–1: TDS 400A Interconnections (Cont.) 9–3. . . . . . . . . . . . . . . . .
Figure 9–2: TDS 400A Block Diagram 9–4. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–2: TDS 400A Block Diagram (Cont.) 9–5. . . . . . . . . . . . . . . . . . .
Figure 10–1: External and Front Panel Modules 10–7. . . . . . . . . . . . . . . . .
Figure 10–2: Internal Modules 10–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10–3: Cables and Routing 10–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
vi TDS 410A, TDS 420A & TDS 460A Service Manual
List of Tables
Table 1–1: Key Features of the TDS 400A Oscilloscopes 1–1. . . . . . . . . .
Table 1–2: Record Length vs. Divisions per Record 1–3. . . . . . . . . . . . . .
Table 1–3: Nominal Traits — Signal Acquisition System 1–9. . . . . . . . . .
Table 1–4: Nominal Traits — Time Base System 1–11. . . . . . . . . . . . . . . .
Table 1–5: Nominal Traits — Triggering System 1–11. . . . . . . . . . . . . . . .
Table 1–6: Nominal Traits — Display System 1–12. . . . . . . . . . . . . . . . . . .
Table 1–7: Nominal Traits — Data Storage 1–12. . . . . . . . . . . . . . . . . . . . .
Table 1–8: Nominal Traits — GPIB Interface, Video Output, and Power
Fuse 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–9: Nominal Traits — Mechanical 1–13. . . . . . . . . . . . . . . . . . . . . .
Table 1–10: Warranted Characteristics — Signal Acquisition System . . . . . .
1–17
Table 1–11: Warranted Characteristics — Time Base System 1–19. . . . . .
Table 1–12: Warranted Characteristics — Triggering System 1–20. . . . .
Table 1–13: Warranted Characteristics — Probe Compensator Output . . . .
1–20
Table 1–14: Warranted Characteristics — Power Requirements 1–20. . .
Table 1–15: Warranted Characteristics — Environmental, Safety, and
Reliability 1–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–16: Typical Characteristics — Signal Acquisition System 1–23. .
Table 1–17: Typical Characteristics — Time Base System 1–24. . . . . . . . .
Table 1–18: Typical Characteristics — Triggering System 1–25. . . . . . . .
Table 1–19: Typical Characteristics — Data Handling 1–26. . . . . . . . . . .
Table 2–1: Power-Cord Conductor Identification 2–2. . . . . . . . . . . . . . . .
Table 2–2: Power Cord Identification 2–2. . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–3: Effects of Corrupted Data 2–4. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–1: Test Equipment 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–2: DC Offset Accuracy 4–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–3:Analog Bandwidth (TDS 410A and TDS 420A) 4–27. . . . . . . .
Table 4–4:Analog Bandwidth (TDS 460A) 4–28. . . . . . . . . . . . . . . . . . . . .
Table 5–1:Adjustments Required for Module Replaced 5–3. . . . . . . . . .
Table 5–2:Adjustments and Dependencies 5–4. . . . . . . . . . . . . . . . . . . . .
Table 5–3: Test Equipment, Fixtures, and Supplies 5–5. . . . . . . . . . . . . .
Table 5–4: GPIB Board Configuration1 5–7. . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
TDS 410A, TDS 420A & TDS 460A Service Manual vii
Table 6–1: Relative Susceptibility to Static-Discharge Damage 6–3. . . . .
Table 6–2: External Inspection Check List 6–5. . . . . . . . . . . . . . . . . . . . .
Table 6–3: Internal Inspection Check List 6–6. . . . . . . . . . . . . . . . . . . . . .
Table 6–4: Tools Required for Module Removal 6–12. . . . . . . . . . . . . . . . .
Table 6–5:Access Instructions for Modules in Figure 6–2 6–15. . . . . . . . .
Table 6–6:Access Instructions for Modules in Figure 6–3 6–17. . . . . . . . .
Table 6–7:Access (and Removal) Instructions for Cables
in Figure 6–4 6–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–8: Troubleshooting Test Equipment, Fixtures, and Supplies 6–71
Table 6–9: Connections for a 9 to 25 Pin Null Modem Cable 6–72. . . . . .
Table 6–10: Diagnostic Failure Priority Lists 6–77. . . . . . . . . . . . . . . . . . .
Table 6–11: Normal Output Voltage 6–79. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–12: Power Supply Maximum Current 6–81. . . . . . . . . . . . . . . . . .
Table 6–13: Front Panel Connector Voltages 6–87. . . . . . . . . . . . . . . . . . . .
Table 6–14: Channel and P1 Signal Locations 6–89. . . . . . . . . . . . . . . . . . .
Table 6–15:A05 Attenuator Board Power 6–90. . . . . . . . . . . . . . . . . . . . . .
Table 6–16:A04 Acquisition Board Power 6–91. . . . . . . . . . . . . . . . . . . . . .
Table 6–17: Regulator Voltages 6–93. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–18: J7 Voltages 6–93. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–19: J8 Front Panel Voltages 6–93. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–1: International Power Cords 7–2. . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–2: Standard Accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–3: Probe Accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–4: Optional Accessories 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–6: Probe Accessories 7–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–7: Accessory Software 7–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
viii TDS 410A, TDS 420A & TDS 460A Service Manual

TDS 410A, TDS 420A & TDS 460A 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.
Only qualified personnel should perform service procedures.
Injury Precautions
To avoid fire hazard, use only the power cord specified for this product.
To avoid electric shock or fire hazard, do not apply a voltage to a terminal that is
outside the range specified for that terminal.
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.
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
To avoid fire hazard, use only the fuse type and rating specified for this product.
To avoid electric shock, do not operate this product in wet or damp conditions.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
Product Damage Precautions
Do not operate this product from a power source that applies more than the
voltage specified.
To prevent product overheating, provide proper ventilation.
Use Proper Power Cord
Avoid Electric Overload
Ground the Product
Do Not Operate Without
Covers
Use Proper Fuse
Do Not Operate in
Wet/Damp Conditions
Do Not Operate in
Explosive Atmosphere
Use Proper Power Source
Provide Proper Ventilation

General Safety Summary
xTDS 410A, TDS 420A & TDS 460A Service Manual
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
Safety Terms and Symbols
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.
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.
The following symbols may appear on the product:
DANGER
High Voltage ProtectiveGround (Earth)Terminal ATTENTION Referto
Manual
Double
Insulated
Do Not Operate With
Suspected Failures
Terms in This Manual
Terms on the Product
Symbols on the Product

TDS 410A, TDS 420A & TDS 460A 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 perform internal service or adjustments of this product unless another
person capable of rendering first aid and resuscitation is present.
To avoid electric shock, disconnect the main power by means of the power cord
or, if provided, the power switch.
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.
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.
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.
Do Not Service Alone
Disconnect Power
Use Caution When
Servicing the CRT
Use Care When Servicing
With Power On
X-Radiation

Service Safety Summary
xii TDS 410A, TDS 420A & TDS 460A Service Manual

TDS 410A, TDS 420A & TDS 460A Service Manual xiii
Preface
This service manual provides service information for the TDS 410A, TDS 420A,
and TDS 460A Digitizing Oscilloscopes.
STOP. If servicing a TDS 410A, follow the procedures for the TDS 420A, but
ignore all references to CH 3 and CH 4.
Manual Structure
This manual is divided into Chapters such as Specifications and Theory of
Operation.Further, it is divided into subsections such as Product Description
and Removal and Installation Procedures.
Sections containing procedures also contain introductions to those procedures.
Be sure to read these introductions because they provide information needed to
do the service correctly and efficiently. The following is a brief description of
each manual chapter.
HSpecifications contains a product description of the digitizing oscilloscope
and tables of the characteristics and descriptions that apply to it.
HOperating Information is this chapter. It includes a description of how this
manual is structured as well as general information and operating instruc-
tions at the level needed to safely power on and service this oscilloscope. A
statement of the service strategy that this manual supports and instructions
for shipment of the digitizing oscilloscope are found in this chapter.
HTheory of Operation contains circuit descriptions that support general service
and fault isolation.
HPerformance Verification contains a collection of procedures for confirming
that this digitizing oscilloscope functions properly and meets warranted
limits.
HAdjustment Procedures contains a collection of procedures for adjusting this
digitizing oscilloscope to meet warranted limits.
HMaintenance contains information and procedures for doing preventive and
corrective maintenance of the digitizing oscilloscope. Instructions for
cleaning, for module removal and installation, and for fault isolation to a
module are found here.

Preface
xiv TDS 410A, TDS 420A & TDS 460A Service Manual
HOptions contains information on the factory-installed options that may be
present in your oscilloscope.
HElectrical Parts List contains a statement referring you to the Mechanical
Parts List, where both electrical and mechanical modules are listed.
See below.
HDiagrams contains a block diagram and an interconnection diagram useful
for isolating failed modules.
HMechanical Parts List 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.
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 module; for
example, the chassis of the oscilloscope is a module.
Symbols and terms related to safety appear in the General Safety Summary and
Service Safety Summary found at the beginning of this manual.
Besides the symbols related to safety, this manual uses the following symbols:
STOP. This “stop sign” labels information which you must 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
procedures to help identify certain readouts and menu functions
on screen.
Modules
Safety
Symbols

Preface
TDS 410A, TDS 420A & TDS 460A Service Manual xv
Related Manuals
These other manuals are available for the TDS 410A, TDS 420A, and TDS 460A
Digitizing Oscilloscopes.
HThe Reference gives you a quick overview of how to operate your oscillo-
scope.
HThe User Manual provides instructions on how to operate your oscilloscope.
HThe Programmer Manual provides complete information on programming
and remote control of the oscilloscope through the GPIB.

Preface
xvi TDS 410A, TDS 420A & TDS 460A Service Manual