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 T ektronix, Inc. 1995. All rights reserved.
T ektronix 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.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
KlipChip is a trademark of T ektronix, Inc.
WARRANTY
T ektronix 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, T ektronix, 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 T ektronix, with shipping charges prepaid.
T ektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
T ektronix 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. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than T ektronix 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 CUST OMER FOR BREACH OF THIS WARRANTY. TEKTRONIX
AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT , SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Table of Contents
Specifications
Operating Information
General Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Servicing xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Strategy for Servicing xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T ektronix Service xviii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nominal Traits 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W arranted Characteristics 1–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T ypical Characteristics 1–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 T ests 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Tests 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prerequisites 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Required 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T est 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 410A, TDS 420A & TDS 460A Service Manual
i
Table of Contents
Adjustment Procedures
Maintenance
Sine Wave Generator Leveling Procedure 4–55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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
Electrical Parts List
Diagrams
Mechanical Parts List
Options and Accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Parts 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
TDS 410A, TDS 420A & TDS 460A Service Manual
List of Figures
Table of Contents
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Table of Contents
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. . . . . . . . . . . . . . . . . . .
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TDS 410A, TDS 420A & TDS 460A Service Manual
Table of Contents
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 410A, TDS 420A & TDS 460A Service Manual
v
Table of Contents
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. . . . . . . . . . . . . . . . . . . . . . . .
vi
TDS 410A, TDS 420A & TDS 460A Service Manual
Table of Contents
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 410A, TDS 420A & TDS 460A Service Manual
vii
Table of Contents
viii
TDS 410A, TDS 420A & TDS 460A Service Manual
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
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
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
Use Proper Power Source
Provide Proper Ventilation
TDS 410A, TDS 420A & TDS 460A Service Manual
Do not operate this product from a power source that applies more than the
voltage specified.
To prevent product overheating, provide proper ventilation.
ix
General Safety Summary
Do Not Operate With
Suspected Failures
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
Safety Terms and Symbols
Terms in This Manual
Terms on the Product
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:
Symbols 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
Protective Ground
(Earth) T erminal
ATTENTION
Refer to
Manual
Double
Insulated
x
TDS 410A, TDS 420A & TDS 460A Service Manual
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
Disconnect Power
Use Caution When
Servicing the CRT
Use Care When Servicing
With Power On
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.
X-Radiation
TDS 410A, TDS 420A & TDS 460A Service Manual
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.
xi
Service Safety Summary
xii
TDS 410A, TDS 420A & TDS 460A Service Manual
Preface
Manual Structure
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.
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.
H Specifications contains a product description of the digitizing oscilloscope
and tables of the characteristics and descriptions that apply to it.
H Operating 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.
H Theory of Operation contains circuit descriptions that support general service
and fault isolation.
H Performance Verification contains a collection of procedures for confirming
that this digitizing oscilloscope functions properly and meets warranted
limits.
H Adjustment Procedures contains a collection of procedures for adjusting this
digitizing oscilloscope to meet warranted limits.
H Maintenance 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.
TDS 410A, TDS 420A & TDS 460A Service Manual
xiii
Preface
Manual Conventions
H Options contains information on the factory-installed options that may be
present in your oscilloscope.
H Electrical Parts List contains a statement referring you to the Mechanical
Parts List, where both electrical and mechanical modules are listed.
See below.
H Diagrams contains a block diagram and an interconnection diagram useful
for isolating failed modules.
H Mechanical Parts List includes a table of all replaceable modules, their
descriptions, and their Tektronix part numbers.
This manual uses certain conventions which you should become familiar with
before doing service.
Modules
Safety
Symbols
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.
xiv
TDS 410A, TDS 420A & TDS 460A Service Manual
Related Manuals
Preface
These other manuals are available for the TDS 410A, TDS 420A, and TDS 460A
Digitizing Oscilloscopes.
H The Reference gives you a quick overview of how to operate your oscillo-
scope.
H The User Manual provides instructions on how to operate your oscilloscope.
H The Programmer Manual provides complete information on programming
and remote control of the oscilloscope through the GPIB.
TDS 410A, TDS 420A & TDS 460A Service Manual
xv
Preface
xvi
TDS 410A, TDS 420A & TDS 460A Service Manual
Introduction
Before Servicing
This section contains general information critical to safe and effective servicing
of this oscilloscope, the manual service strategy, and a description of repair and
warranty services available from Tektronix.
This manual is for servicing the TDS 410A, TDS 420A, & TDS 460A Digitizing
Oscilloscopes. To prevent injury to yourself or damage to the oscilloscope, do
the following before you attempt service:
H Be sure you are a qualified service person
H Read the safety summaries found at the beginning of this manual
H Read Strategy for Servicing and Supplying Operating Power in
this subsection
When using this manual for servicing, be sure to heed all warnings, cautions,
and notes.
Strategy for Servicing
STOP. If servicing a TDS 410A, follow the procedures for the TDS 420A, but
ignore all references to CH 3 and CH 4.
STOP. Throughout this manual, any field-replaceable component, assembly, or
part of this oscilloscope is referred to generically as a module.
This manual contains all the information needed for periodic maintenance of
your oscilloscope. (Examples of such information are procedures for checking
performance and for readjustment.) Further, it contains all information for
corrective maintenance down to the module level. This means that the procedures, diagrams, and other troubleshooting aids help isolate failures to a specific
module, rather than to components of that module. Once a failure is isolated,
replace the module with a fully tested module obtained from the factory.
All modules are listed in Chapter 10, Mechanical Parts List. To isolate a failure
to a module, use the fault isolation procedures found in Chapter 6, Maintenance.
TDS 410A, TDS 420A & TDS 460A Service Manual
xvii
Introduction
Tektronix Service
To remove and replace any failed module, follow the instructions in Removal
and Installation Procedures, also found in Chapter 6.
Tektronix provides service to cover repair under warranty as well as other
services that may provide a cost-effective answer to your service needs.
Whether providing warranty repair service or any of the other services listed
below, Tektronix service technicians, trained on Tektronix products, are best
equipped to service your digitizing oscilloscope. Tektronix technicians are
appraised of the latest information on improvements to the product as well as the
latest new options to the product.
Warranty Repair Service
Repair or Calibration
Service
Tektronix warrants this product for three years from date of purchase, excluding
probes for which the warranty is one year. (The warranty appears on the back of
the title page in this manual.) Tektronix technicians provide warranty service at
most Tektronix service locations worldwide. Your Tektronix product catalog lists
all service locations worldwide.
The following services may be purchased to tailor repair and/or calibration of
your digitizing oscilloscope to fit your requirements.
Option 95. With this option, Tektronix ships a test data report for
the oscilloscope.
Option 96. With this option, Tektronix ships a Certificate of Calibration which
states this oscilloscope meets or exceeds all warranted specifications and was
calibrated using standards and instruments whose accuracies are traceable to the
National Institute of Standards and Technology, an accepted value of a natural
physical constant, or a ratio calibration technique. The calibration is in compliance with US MIL-STD-45662A.
At-Depot Service. Tektronix offers several standard-priced adjustment (calibration) and repair services:
xviii
H A single repair or adjustment.
H Calibrations using equipment and procedures that meet the traceability
standards specific to the local area.
H Annual maintenance agreements that provide for either calibration and repair
or calibration only of the oscilloscope.
TDS 410A, TDS 420A & TDS 460A Service Manual
Introduction
Of these services, the annual maintenance agreement offers a particularly
cost-effective approach to service for many owners of the TDS 400A Digitizing
Oscilloscopes. You can purchase such agreements to span several years.
Self Service
Tektronix supports repair to the module level by providing Module Exchange
and Module Repair and Return.
Module Exchange. This service reduces down time for repair by allowing you to
exchange most modules for remanufactured ones. Tektronix ships you an
updated and tested exchange module from the Beaverton, Oregon service center,
typically within 24 hours. Each module comes with a 90-day service warranty.
For More Information. Contact your local Tektronix service center or sales
engineer for more information on any of the repair or adjustment services
just described.
TDS 410A, TDS 420A & TDS 460A Service Manual
xix
Introduction
xx
TDS 410A, TDS 420A & TDS 460A Service Manual
Product Description
This Chapter begins with a general description of the traits of the TDS 400A
Digitizing Oscilloscopes. Three sections follow, one for each of three classes of
traits: nominal traits, warranted characteristics, and typical characteristics.
General
The TDS 400A Digitizing Oscilloscopes are portable, four-channel instruments
suitable for use in a variety of test and measurement applications and systems.
Table 1–1 lists key features.
T able 1–1: Key Features of the TDS 400A Oscilloscopes
Feature Description
Digitizing rate, maximum 100 MS/s on each channel simultaneously
Analog bandwidth TDS 460A: 400 MHz
TDS 420A: 200 MHz
TDS 410A: 200 MHz
Channels TDS 460A: Four, each with 8-bit resolution
TDS 420A: Four, each with 8-bit resolution
TDS 410A: Two, each with 8-bit resolution
Record lengths, maximum 30,000 samples (120,000 with option 1M)
Acquisition modes Sample, envelope, average, high-resolution, and peak-detect
Trigger modes Edge
With Option 05, video trigger modes include:
NTSC, SECAM, PAL, and Custom
Display Modes Infinite and variable persistence, roll, fit to screen, and dual
waveform zoom
Storage NVRAM storage for saving waveforms, hardcopies, and setups
With Option 1F, 1.44 Mbyte, 3.5 inch, DOS 3.3-or-later floppy
disk
I/O Full GPIB programmability
Hardcopy output using GPIB and, with Option 13, RS-232 or
Centronics ports
Math Including: invert, add, subtract, multiply, and with Option 2F,
integral, differential, and FFT
User interface A graphical user interface, on-line help. and a logical
front-panel layout
TDS 410A, TDS 420A & TDS 460A Service Manual
1–1
Product Description
User Interface
This digitizing oscilloscope uses a combination of front-panel buttons, knobs,
and on-screen menus to control its many functions. The front-panel controls are
grouped according to function: vertical, horizontal, trigger, and special. Within
each group, any function likely to get adjusted often, such as vertical positioning
or the time base setting, is set directly by its own front-panel knob.
Menus
Indicators
General Purpose Knob
Those functions for which control settings are usually changed less often, such as
vertical coupling and horizontal mode, are set indirectly. That is, pressing one
(sometimes two) front-panel button, such as VERTICAL, displays a menu of
functions at the bottom of the screen that are related to that button. (For the
VERTICAL button, the menu displayed contains functions such as coupling and
bandwidth.) Using the buttons below this main menu to select a function, such as
coupling, displays a side menu of settings for that function, such as AC, DC, or
GND (ground) coupling, at the right side of the screen. Use the buttons to the
right of the menu to select a setting, such as DC.
Several on-screen readouts help you keep track of the settings for various
functions, such as vertical and horizontal scale and trigger level. There are also
readouts to display the results of measurements made using cursors or using the
automatic parameter extraction feature (called measure) and readouts to display
the status of the oscilloscope.
Menus are also used to assign the general purpose knob to adjust a selected
parameter function. The method employed is the same as for selecting a
function, except the final selection in the side menu causes the general purpose
knob to adjust some function, such as the position of measurement cursors on
screen or the setting for the fine gain of a channel.
1–2
GUI
The user interface also makes use of a GUI, or Graphical User Interface, to make
setting functions and interpreting the display more intuitive. Some menus and
status are displayed using iconic representations of function settings such as
those shown here for full, 100 MHz, and 20 MHz bandwidth. Such icons allow
you to more readily determine status or the available settings.
TDS 410A, TDS 420A & TDS 460A Service Manual
Signal Acquisition System
The signal acquisition system provides vertical channels with calibrated vertical
scale factors from 1 mV to 10 V per division. All input channels can be acquired
simultaneously.
You can display, vertically position, and offset each input channel. You can also
limit their bandwidth (to either 100 MHz or 20 MHz), specify their vertical
coupling, and adjust their fine gain.
Besides the input channels, up to three math waveforms and four reference
waveforms are available for display. (A math waveform results when you specify
operations such as add or invert; a reference waveform results when you save a
live waveform in a reference memory.)
Horizontal System
There are three horizontal display modes: main only, main intensified, and
delayed only. You can select among various horizontal record length settings (see
Table 1–2).
Product Description
T able 1–2: Record Length vs. Divisions per Record
Record Length
120,000 2400 divs
60,000 1200 divs
30,000 600 divs
15,000 300 divs
5,000 100 divs
2,500 50 divs
1,000 20 divs
500 10 divs
1
The 60,000 and 120,000 point record lengths are available
only with Option 1M.
2
If you select the Hi Res acquisition mode, the maximum
Option 1M record length reduces to 60,000 points.
1, 2
Divisions per Record
(50 Points/Division)
TDS 410A, TDS 420A & TDS 460A Service Manual
1–3
Product Description
Trigger System
Both the delayed only display and the intensified zone on the main intensified
display can be delayed by time with respect to the main trigger. You can set both
to display immediately after the delay (delayed runs after main mode); you can
set the delayed display to display at the first valid trigger after the delay (delayed
triggerable mode).
The delayed display (or the intensified zone) can also be delayed by a selected
number of events. In such a case, the events source is the delayed trigger source.
For any events signal, the delayed-trigger system conditions the signal by
determining the source, coupling, and other things, of that signal.
At time base settings of 20 ms per division or slower the records are displayable
using Roll mode. Both untriggered roll and triggered roll modes are available.
The triggering system comprises a complete set of features for triggering the
signal-acquisition system. In edge trigger mode, you can select the source, slope,
coupling, mode (auto or normal), and holdoff.
Acquisition Control
Oscilloscopes ordered with Option 5 also have the video trigger mode. This
trigger mode allows triggering on NTSC-standard, PAL-standard, SECAM-standard, and custom video waveforms. You can configure the triggering for
interlaced or non-interlaced scanning, different scan rates, field selection, line
selection, and for delay by line or time.
You can choose where the trigger point is located within the acquired waveform
record by selecting the amount of pretrigger data displayed. You can select
presets of 10%, 50%, and 90% of pretrigger data in the horizontal menu, or you
can assign the General Purpose knob to set pretrigger data to any value within
the limits of trigger position resolution.
Depending on your measurement requirements, you can specify the mode and
manner in which signals are acquired and processed:
H You can select equivalent-time sampling on repetitive signals or interpola-
tion of points sampled on non-repetitive signals. Both can increase the
apparent sample rate on the waveform when maximum real-time rates are
reached.
H You can use peak-detect, high-resolution, sample, envelope, and average
modes to acquire signals.
1–4
H You can set the acquisition to stop after a single acquisition (or sequence of
acquisitions if acquiring in average or envelope modes).
TDS 410A, TDS 420A & TDS 460A Service Manual
On-Board User Assistance
Two features that help you set up this digitizing oscilloscope to make your
measurements are help and autoset.
Product Description
Help
Autoset
Help displays operational information about any front-panel control. When help
mode is in effect, manipulating any front-panel control causes the digitizing
oscilloscope to display information about that control. When help is first
invoked, an introduction to help is displayed on screen.
Autoset automatically sets up the digitizing oscilloscope for a viewable display
based on the input signal.
Measurement Assistance
Once you have set up to make your measurements, the features cursor and
measure can help you quickly make those measurements.
Cursor
Two types of cursors are provided for making parametric measurements on the
displayed waveforms. Voltage can be measured between the positions of H Bar
(horizontal) cursors, and time can be measured between V Bar (vertical) cursors.
These are delta measurements; that is, measurements based on the difference
between two cursors.
You can use both V Bar and H Bar cursors to make absolute measurements—
measurements relative to a defined level or event. In the case of the H Bars,
either cursor can be selected to read out its voltage with respect to the ground
reference level of any channel; in the case of the V Bars, its time with respect to
the trigger point (event) of the acquisition.
For time measurements, units can be either base (seconds or clocks) or inverse
base (Hertz or 1/clocks).
Measure
TDS 410A, TDS 420A & TDS 460A Service Manual
Measure can automatically extract parameters from the signal input to the
digitizing oscilloscope. Any four out of the more than 20 parameters available
can be displayed on the screen. The displayed parameters are extracted continuously and the results updated on screen as the digitizing oscilloscope continues
to acquire waveforms.
1–5
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