Tektronix WFM 601A User manual

Service Manual
WFM 601A, WFM 601E, & WFM 601M
Serial Digital Component Waveform Monitor
070-9836-05
This document applies to firmware version 1.00
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
www.tektronix.com

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., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of three (3) years 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.

WFM 601A, WFM 601E, & WFM 601M Service Manual i
Table of Contents
General Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics Tables 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Information
Installation 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Installation 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Power 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear-Panel Connectors 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Information 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel Overview 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Menus 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Panel Connectors 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Block Diagram Descriptions 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram 1, Input and Waveform Display 3–1. . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram 2, Component 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram 3, Microprocessor and Control 3–5. . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supplies 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification
Equipment Required 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration Data Report 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification Procedure 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedures
Equipment Required 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Adjustment Software 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the TG2000/DVG1 Opt S1 Generator 5–9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedure 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Board Adjustment Locations 5–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform Illustrations 5–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TV Generator Test Signals 5–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
Service Options 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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ii WFM 601A, WFM 601E, & WFM 601M Service Manual
Inspection and Cleaning 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Replacement Instructions 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 6–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
After Repair Adjustments 6–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Upgrade Software 6–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repackaging 6–48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options
Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Electrical Parts
Parts Ordering Information 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams
Diagrams and Circuit Board Illustrations 9–1. . . . . . . . . . . . . . . . . . . . . .
Symbols 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Values 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graphic Items and Special Symbols Used in This Manual 9–1. . . . . . . . . . . . . . . . .
Component Locator Diagrams 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Mechanical Parts
Parts Ordering Information 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Mechanical Parts List 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . .

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WFM 601A, WFM 601E, & WFM 601M Service Manual iii
List of Figures
Figure 2–1: Dimensions of the 1700F00 cabinet 2–2. . . . . . . . . . . . . . . . . .
Figure 2–2: 1700F02 portable cabinet 2–3. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: Rear view of the waveform monitor in a 1700F00
cabinet 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–4: The 1700F05 rack cabinet holds two instruments 2–5. . . . . .
Figure 2–5: 1700F05 cabinet showing utility drawer and blank panel 2–6
Figure 2–6: The WFM 601M waveform monitor front panel 2–9. . . . . . .
Figure 2–7: Elements of the waveform monitor menu controls 2–13. . . . .
Figure 2–8: Rear panel of the waveform monitor 2–14. . . . . . . . . . . . . . . .
Figure 2–9: Pin assignments for the RS-232 connector 2–15. . . . . . . . . . . .
Figure 2–10: Pin assignments for the REMOTE connector 2–16. . . . . . . .
Figure 3–1: Power supply block diagram 3–6. . . . . . . . . . . . . . . . . . . . . . .
Figure 4–1:Audio cable adapter 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–2: Timing cursors 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–3: HF Bowtie magnified to measure null offset 4–18. . . . . . . . . .
Figure 4–4:Arrowhead gamut check 4–19. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–1: Jumper cable adapter 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–2: Minimum configurations for remote communications 5–4. .
Figure 5–3: Typical display of the adjustment procedures 5–7. . . . . . . . .
Figure 5–4: Location of circuit boards 5–15. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–5:A1 Power Supply board 5–15. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–6:A3 Main board 5–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–7:A5 Serial board 5–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–8:A7 Component board 5–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–9: Trace Rotation, Y Alignment, and Geometry – Horizontal
center marks 5–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–10: Post Readout, Offset, and Gain 5–18. . . . . . . . . . . . . . . . . . . .
Figure 5–11: Monitor Out YOffset 5–18. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–12: Gamut Limit – Strobe pulses 5–19. . . . . . . . . . . . . . . . . . . . . .
Figure 5–13: On-Screen Frequency Response 5–19. . . . . . . . . . . . . . . . . . .
Figure 5–14: Bowtie Timing 5–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–15: Electronic Graticule Adjustment 5–20. . . . . . . . . . . . . . . . . .
Figure 5–16: Diamond Eye Opening 5–21. . . . . . . . . . . . . . . . . . . . . . . . . . .

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iv WFM 601A, WFM 601E, & WFM 601M Service Manual
Figure 5–17:Arrowhead PBPR – A7R827 adjustment 5–21. . . . . . . . . . . .
Figure 5–18:Arrowhead PBPR – A7R868 adjustment 5–21. . . . . . . . . . . .
Figure 5–19: Jitter Gain 5–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–20:Audio Graticule X and Y Offsets 5–23. . . . . . . . . . . . . . . . . . .
Figure 5–21: Digital Cursor – Correct waveform and Data Cursor
alignment 5–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–22: Digital Cursor – Alignment in DATA view 5–24. . . . . . . . . . .
Figure 5–23: 100% Color Bars signal 5–25. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–24: 100% Color Bars with Level Reference 5–25. . . . . . . . . . . . .
Figure 5–25: 2.5 MHz Bowtie signal 5–26. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–26: 5-step Staircase signal 5–26. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–27: Shallow Ramp signal 5–27. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–28: 100% Sweep signal 5–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–29: Multiburst signal 5–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–1: Multiple pin connectors 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–2: Removing large cable connectors 6–7. . . . . . . . . . . . . . . . . . .
Figure 6–3: Removing the case from the waveform monitor 6–7. . . . . . .
Figure 6–4: Removing the CRT bezel 6–8. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–5: Removing the bezel knob panel from the bottom of the
waveform monitor 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–6: Replacing graticule light bulbs using tweezers 6–10. . . . . . . .
Figure 6–7: Removing the CRT 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–8: Routing for CRT wire harness 6–12. . . . . . . . . . . . . . . . . . . . . .
Figure 6–9: Removing the front-panel assembly 6–13. . . . . . . . . . . . . . . . .
Figure 6–10: Front-panel assembly 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–11: Removing the rear-panel input and BNC assembly 6–14. . . .
Figure 6–12: Connection locations on the A4 Input board 6–14. . . . . . . . .
Figure 6–13: Disassembling the BNC/Input assembly 6–15. . . . . . . . . . . . .
Figure 6–14: Components of the fan assembly 6–16. . . . . . . . . . . . . . . . . . .
Figure 6–15: Connections on the A3 Main Board 6–17. . . . . . . . . . . . . . . .
Figure 6–16: Removing the Power Supply board 6–18. . . . . . . . . . . . . . . . .
Figure 6–17: Location of connections on the Serial board 6–19. . . . . . . . .
Figure 6–18: Removing the A5 Serial board 6–20. . . . . . . . . . . . . . . . . . . . .
Figure 6–19: Removing the Component and DAC boards 6–21. . . . . . . . .
Figure 6–20: Separating the DAC and Component boards 6–22. . . . . . . .
Figure 6–21: Location of circuit board assemblies 6–25. . . . . . . . . . . . . . . .
Figure 6–22: Location of the line fuse on Power Supply board 6–26. . . . .
Figure 6–23: Configuration to troubleshoot the DAC board 6–33. . . . . . .

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WFM 601A, WFM 601E, & WFM 601M Service Manual v
Figure 6–24: Configuration to troubleshoot the Component board 6–34. .
Figure 6–25: Configuration for RS-232 communications 6–38. . . . . . . . . .
Figure 6–26: Main board showing location of U13 6–39. . . . . . . . . . . . . . .
Figure 6–27: Repackaging a waveform monitor 6–48. . . . . . . . . . . . . . . . .
Figure 9–1: Main block diagram 1 9–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–2: Component block diagram 2 9–4. . . . . . . . . . . . . . . . . . . . . . .
Figure 9–3: Microprocessor and control block diagram 3 9–5. . . . . . . . .
Figure 9–4:A4 Input board and A4A1 BNC board 9–6. . . . . . . . . . . . . . .
Figure 9–5:A5 Serial board (front) 9–8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–6:A5 Serial board (back) 9–10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–7:A8 DAC board 9–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–8:A7 Component board 9–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–9:A3 Main board (front) 9–54. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–10:A3 Main board (back) 9–57. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–11: A2 Front Panel board 9–76. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–12:A1 Power Supply board 9–78. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10–1: Front Panel exploded view 10–6. . . . . . . . . . . . . . . . . . . . . . . .
Figure 10–2: DAC Bd, Component Bd, and CRT exploded view 10–8. . . .
Figure 10–3: Serial, Power, and Main boards exploded view 10–10. . . . . . .
Figure 10–4: Rear panel and Fan exploded view 10–12. . . . . . . . . . . . . . . . .

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vi WFM 601A, WFM 601E, & WFM 601M Service Manual

Table of Contents
WFM 601A, WFM 601E, & WFM 601M Service Manual vii
List of Tables
Table 1–1: Electrical specifications 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: CRT display 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–3:AC power source 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–4: Environmental characteristics 1–11. . . . . . . . . . . . . . . . . . . . . .
Table 1–5: Physical characteristics 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–6: Safety standards 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–7: Safety certification compliance 1–12. . . . . . . . . . . . . . . . . . . . . .
Table 1–8: Certifications and compliances 1–13. . . . . . . . . . . . . . . . . . . . . .
Table 2–1: Remote connector pin assignments and functions 2–16. . . . . .
Table 4–1:Audio values 4–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 5–1: List of special equipment and where it is used 5–5. . . . . . . . .
Table 5–2: Signals required for adjustment procedure 5–10. . . . . . . . . . .
Table 6–1: Static susceptibility 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–2: Circuit board functional names 6–25. . . . . . . . . . . . . . . . . . . . .
Table 6–3: Power supply fault symptoms 6–27. . . . . . . . . . . . . . . . . . . . . . .
Table 6–4: Low volts supply voltages 6–28. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–5: Control circuit test points 6–29. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–6: Shut down logic levels 6–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–7: High volts supply fault symptoms 6–31. . . . . . . . . . . . . . . . . . .
Table 6–8: High-voltage oscillator test points 6–32. . . . . . . . . . . . . . . . . . .
Table 6–9:Adjustment required after repairing circuit boards 6–35. . . .
Table 6–10: Remote communication parameters 6–38. . . . . . . . . . . . . . . .
Table 6–11:Adjustment and verification required after an upgrade or
configuration 6–46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 8–1: List of circuit board assemblies 8–6. . . . . . . . . . . . . . . . . . . . .
Table 9–1:A4 Input board component locator 9–6. . . . . . . . . . . . . . . . . . .
Table 9–2:A4A1 BNC board component locator 9–6. . . . . . . . . . . . . . . . .
Table 9–3: WFM 601M A5 Serial board (front) component locator 9–8.
Table 9–4: WFM 601M A5 Serial board (back) component locator 9–10.
Table 9–5: WFM 601A A5 Serial board (front) component locator* 9–22.

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viii WFM 601A, WFM 601E, & WFM 601M Service Manual
Table 9–6: WFM 601A A5 Serial board (back) component locator* 9–22.
Table 9–7: WFM 601E A5 Serial board (front) component locator* 9–26.
Table 9–8: WFM 601E A5 Serial board (back) component locator* 9–27.
Table 9–9:A8 DAC board component locator 9–36. . . . . . . . . . . . . . . . . . .
Table 9–10:A7 Component board component locator 9–44. . . . . . . . . . . .
Table 9–11:A3 Main board (front) component locator 9–55. . . . . . . . . . . .
Table 9–12:A3 Main board (back) component locator 9–57. . . . . . . . . . . .
Table 9–13:A2 Front Panel board (front) component locator 9–76. . . . . .
Table 9–14:A2 Front Panel board (back) component locator 9–76. . . . . .
Table 9–15:A1 Power Supply board component locator 9–79. . . . . . . . . . .

WFM 601A, WFM 601E, & WFM 601M 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.
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
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.
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.
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.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
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.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
Termsin 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.
To Avoid Fire or
Personal Injury
Symbols and Terms

General Safety Summary
x WFM 601A, WFM 601E, & WFM 601M Service Manual
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Termson 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

WFM 601A, WFM 601E, & WFM 601M 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 WFM 601A, WFM 601E, & WFM 601M Service Manual

WFM 601A, WFM 601E, & WFM 601M Service Manual xiii
Preface
This manual provides servicing information for the WFM 601A, WFM 601E,
and WFM 601M Serial Digital Component Waveform Monitors. Procedures
described in this manual are designed for experienced service technicians. For
detailed operating information, refer to your waveform monitor User manual.
See section 7, Options, for the part number of the User manuals.
This manual supports both Module Level (for module exchange) and Component
Level service. Module Level service uses the block diagram and its descriptions
to isolate a problem to the circuits on a particular circuit board. To support
Component Level servicing there are schematic diagrams, circuit board
illustrations, and part location tables for each circuit board.
When preparing to service this instrument, remember that its circuit boards
contain surface mount components. Surface mount components require special
techniques and tools for removal and installation.
Most of the information and procedures in this manual are common across the
family of waveform monitors. However, each waveform monitor has several
unique features. When a procedure or a description is applies to a specific model,
it is indicated with the model number of the waveform monitor in parentheses.
About This Manual
This manual is composed of the following sections:
HSpecifications provides a list of all instrument performance requirements,
operating environment requirements,and certifications.
HOperating Information provides an overview of the main instrument
features.
HTheory of Operation provides a block diagram description of the instrument
circuits.
HPerformance Verification provides a manual procedure for verifying the
performance requirements in the Specifications section.
HAdjustment Procedures provides an automated procedure for adjusting the
waveform monitor following repair.
HMaintenance provides instructions for troubleshooting and replacing
instrument modules.
HOptions provides a list of the available product options.

Preface
xiv WFM 601A, WFM 601E, & WFM 601M Service Manual
HReplaceable Electrical Parts provides a list of all electrical components used
in the instrument.
HDiagrams provides block diagrams, component locators, and schematics.
HReplaceable Mechanical Parts provides a list of all mechanical parts and
electrical modules not contained on a circuit board.
Tektronix maintains a service organization that provides a number of services to
help you maintain the waveform monitor at its specified levels. These services
range from complete repair and adjustment, at a convenient location, to
supplying replacement parts. In addition, Tektronix provides training programs
for service technicians.
NOTE. When considering service offering, remember that Tektronix provides a
limited parts and service warranty for all its products. No customer repairs
should be attempted during the warranty period.
Service Training. Tektronix provides service training in a number of programs.
Classes are held at our Beaverton campus and at convenient locations by
arrangement. To learn more about service training programs, contact your local
Tektronix field office or representative. U.S. customers can call our service
organization directly using 1 (800) TEK WIDE [835-9433]; ask for “Service
Training.”
Field Service Centers. Tektronix maintains service centers worldwide. These
centers provide repair and calibration services for Tektronix instruments. They
can be contacted through your Tektronix field office or representative. In
addition, U.S. and Canadian customers can call 1 (800) TEK WIDE [835-9433]
for assistance in contacting their nearest service center.
Module Exchange. The Tektronix module exchange program provides a quick,
affordable way to return an instrument to operational status. You exchange a
defective module for a calibrated module at a cost well below the new module
price. Contact your Tektronix field office or representative for more information.
U.S. and Canadian customers can call 1 (800) TEK WIDE [835-9433].
NOTE. Circuit boards that are damaged due to mishandling or containing
modifications not originated by Tektronix are not acceptable for the exchange
program.
Tektronix Service
Offerings

Preface
WFM 601A, WFM 601E, & WFM 601M Service Manual xv
When exchanging a circuit board, it is essential that you have the following key
information ready to relay to our technician:
HInstrument type
HSerial number
HInstalled options
HAssembly/circuit board number (AX)
HNine-digit part number (671-XXXX-XX)
HSoftware version number installed on your waveform monitor
Factory Replacement Parts. Replacement parts are available through the local
Tektronix field office or representative. However, many common electronic parts
are available through local sources. Using a local source, where possible, will
eliminate shipping delays.
Changes to Tektronix instruments are sometimes made to accommodate
improved components and to improve circuit performance. Therefore, it is
important to include the following information when ordering parts:
HPart number
HInstrument type or number
HSerial number
HModification or option number (if applicable)
If a part has been replaced with a new or improved part, the new part will be
shipped, if it is a direct replacement. If not directly replaceable the local
Tektronix field office or representative will contact the customer concerning any
changes. After any repair, circuit readjustment may be required.

Preface
xvi WFM 601A, WFM 601E, & WFM 601M Service Manual
Contacting Tektronix
Phone [phone]*
Address Tektronix,Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton,OR97077
USA
Web site www.tektronix.com
Sales support 1-800-833-9200,selectoption1*
Servicesupport 1-800-833-9200,selectoption2*
Technicalsupport Email:[email protected]
1-800-833-9200,selectoption3*
1-503-627-2400
6:00 a.m. – 5:00 p.m. Pacific time
* This phone number is toll free in North America. After office hours, please leave a
voice mail message.
Outside North America, contact a Tektronix sales office or distributor; see the
Tektronix web site for a list of offices.