Tektronix WFM 601A, WFM 601E, WFM 601M 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 © T ektronix, Inc. 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.
T ektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.

WARRANTY

T ektronix 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,
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; c) to repair any damage or malfunction
caused by the use of non-T ektronix 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 P ARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY T O
REP AIR 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.

Table of Contents

Specifications

Operating Information

Theory of Operation

General Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Safety Summary xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preface xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Characteristics T ables 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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 T est Signals 5–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance

Service Options 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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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

List of Figures

Table of Contents

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

List of Tables

Table of Contents

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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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. . . . . . . . . . .

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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.

To Avoid Fire or Personal Injury

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 Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.

Do Not Operate in Wet/Damp Conditions.
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.

Symbols and Terms

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

T erms in this Manual. These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.

ix

General Safety Summary

CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.

T erms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the

marking.
WARNING indicates an injury hazard not immediately accessible as you read the

marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:

WARNING

High Voltage

Protective Ground

(Earth) T erminal

CAUTION

Refer to Manual

Double

Insulated

x

WFM 601A, WFM 601E, & WFM 601M 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. 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.

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

xi

Service Safety Summary

xii

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

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:
H Specifications provides a list of all instrument performance requirements,

operating environment requirements,and certifications.

H Operating Information provides an overview of the main instrument

features.

H Theory of Operation provides a block diagram description of the instrument

circuits.

H Performance Verification provides a manual procedure for verifying the

performance requirements in the Specifications section.

H Adjustment Procedures provides an automated procedure for adjusting the

waveform monitor following repair.

H Maintenance provides instructions for troubleshooting and replacing

instrument modules.

H Options provides a list of the available product options.

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

xiii

Preface

H Replaceable Electrical Parts provides a list of all electrical components used

in the instrument.

H Diagrams provides block diagrams, component locators, and schematics.
H Replaceable Mechanical Parts provides a list of all mechanical parts and

electrical modules not contained on a circuit board.

Tektronix Service

Offerings

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.

xiv

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.

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

Preface

When exchanging a circuit board, it is essential that you have the following key
information ready to relay to our technician:

H Instrument type
H Serial number
H Installed options
H Assembly/circuit board number (AX)
H Nine-digit part number (671-XXXX-XX)
H Software 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:

H Part number
H Instrument type or number
H Serial number
H Modification 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.

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

xv

Preface

Contacting Tektronix

Phone [phone]*

Address Tektronix, Inc.

Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA

Web site www.tektronix.com

Sales support 1-800-833-9200, select option 1*

Service support 1-800-833-9200, select option 2*

Technical support Email: [e-mail]

1-800-833-9200, select option 3*
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.

xvi

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

Specifications

Product Description

This section provides a brief overview of the WFM 601A, WFM 601E, and
WFM 601M waveform monitor product features. The feature list is followed by
the product specifications.

The waveform monitors measure and display 4:2:2 component serial digital
signals. The waveform monitors display serial digital signals as the familiar
component signals and in a variety of standard measurement modes. You can use
the EDH (Error Detection and Handling) system and the suite of automated
checks of the serial digital format to verify data integrity.

Features

Most of the features listed in this section are common across all three waveform
monitors. Where a feature applies only to a specific model, the model is in
parentheses following the feature description. The waveform monitors offer the
following features:

H Two 270 Mbit serial component loop-through inputs
H Digital video standards SMPTE 259M, ITU-R BT.656, and ITU-R BT.601
H RGB and Y-P
H Eye Pattern display with Timing and Voltage Cursors (WFM 601E,

WFM 601M)

H Jitter demodulator with numeric jitter readout and video correlated jitter

waveform display (WFM 601M)

H Parade or Waveform display of Y, P
H RGB and composite Gamut checks with Diamond and Arrowhead displays
H Field, line, and word select with readout and bright up of selected lines on

Picture Monitor Out (Y or G Channel) (WFM 601E, WFM 601M)

H SMPTE RP-165 standard EDH indicator for presence

display format for 525 and 625 line signals

B-PR

, and PR component signals

B

H Digital Waveform and Data displays with Data-cursor correlation between

display modes (WFM 601M)

H Embedded Audio indentification
H Source-level meter and cable-length readout (WFM 601E, WFM 601M)

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

1–1

Specifications

H Lightning and Vector displays
H Reclocked Serial Component Digital output following A/B switching
H Video Reference: Internal Serial Component signal (follows A/B switching)

or external composite
H Audio Lissajous display (WFM 601A)

Menus

Calibrator

Characteristics Tables

An expanded feature set is available through menus. You select menu items with
multi-use bezel buttons and knobs. When you select a menu item, such as
Voltage Cursors, on-screen labels show the current function of the bezel buttons
and knobs.

The waveform monitor provides an internal calibrator signal to set both vertical
and horizontal gain. The calibrator signal is a 700 mV, 100 kHz signal. Press the
CONFIG button and use the bezel knob to select the Calibrate menu. Press the
CAL SIG button to turn on the calibrator signal.

Table 1–1 lists the electrical specifications for the waveform monitors. Perfor­mance requirements are generally quantitative and can be tested by the Perfor-
mance Verification procedure this manual. Reference information describes
useful operating parameters that have typical values. These parameters are not
directly checked in the performance verification procedure. Table 1–8 lists the
EMC compliance specifications.

The Performance Requirements listed in the electrical specification portion of
these specifications apply over an ambient temperature range of 0° C to +40° C.
The rated accuracies are valid when the instrument is calibrated at an ambient
temperature range of +20° C to +30° C, after a warm-up time of 20 minutes.

1–2

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

T able 1–1: Electrical specifications

Characteristic Performance requirement Reference information

Waveform V ertical Deflection

Deflection Factor For digital input: 700 mV digital

input = 700 mV $2% screen

display , any magnifier setting
Variable Gain Range 0.2X to 1.4X
Frequency Response Luminance channel (Y), to

5.0 MHz $2%;

Color difference channels (PB and

PR) to 2.5 MHz $2%
Transient Response

Field Rate Tilt
Line Rate Tilt
Offscreen Recovery 1% variation in baseline of a 5 MHz modulated

Voltage Cursor Accuracy

Differentiated Step Filter
Low Pass Filter

Gain
Response

Serial Digital Video Interface
(SER A and SER B inputs)

Format 270 Mbit/s component. Complies with SMPTE

Input Type Passive loop-through, 75 W compensated
Input Level

Return Loss

Power on

Power off
Insertion Loss
Transmission Bandwidth

$0.5% over 20–30° C, $1%
over rated temperature range

1 $ 1%

RGB on-screen accuracy $3%

Typically $1% to 5.75 MHz luminance (Y)
channel, and $1% to 2.75 MHz for the color

difference (PB and PR) channels

Preshoot v1%
Overshoot v1%
Ringing v1%

Pulse-to-bar ratio 0.99:1 to 1.01:1

v1%
v1%

pulse when positioned anywhere on screen.
X1, X5, or X10 with any variable gain setting

Amplitude of pulses v1% variation

v 3 dB attenuation at 1 MHz, w 40 dB
attenuation at 4 MHz

259M and CCIR 656

800 mV peak-to-peak $10%. Input voltages
outside this range might cause reduced receiver
performance.

w25 dB 1–270 MHz, channels on or off
w15 dB 1–270 MHz
v1%

50 kHz – 300 MHz $1.0 dB
–3 dB at not less than 500 MHz

Specifications

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

1–3

Specifications

T able 1–1: Electrical specifications (cont.)

Characteristic Reference informationPerformance requirement

Loop-through Input Isolation
Serial Receiver Equalization Range Proper operation with 19 dB loss

at 135 MHz using coaxial cable
having 1/√F loss characteristics.
800 mV launch amplitude and 200
meters (655 feet) of Belden 8281
coaxial cable

Serial Video Output (follows SER A/B
channel selection)

Format 270 Mbit/s component; complies with SMPTE

Output Level

Return Loss

Eye Pattern Display
(WFM 601E, WFM601M)

Type Equivalent time sampler
Bandwidth 50 kHz to 450 MHz: –3 dB to

Rise Time 500 ps (20-80%), 775 ps (10-90%)
Aberrations < 10%, 800 mV step
Time Base Jitter < 200 ps peak-to-peak
Jitter Attenuation

10 Hz Clock Bandwidth < 10% for frequencies > 20 Hz. –3 dB at

100 Hz Clock Bandwidth < 10% for frequencies > 300 Hz. –3 dB at

1 kHz Clock Bandwidth < 10% for frequencies > 3 kHz. –3 dB at

Display Modes

Overlay Overlays bits 0-9 of a serial word to form each Eye

10-Eye Parades bits 0-9 in a 10-Eye display

800 mV p-p 10% into 75 W load

+1 dB

50 dB to 300 MHz

259M and CCIR 656
Internal adjustment can change output to less than

600 mV and greater than 1000 mV
15 dB 1–270 MHz

Low frequency –3 dB point is 500 Hz

approximately 10 Hz

approximately 100 Hz

approximately 1 kHz
Up to 3 dB jitter gain from 2–4 kHz

opening

1–4

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

T able 1–1: Electrical specifications (cont.)

Characteristic Reference informationPerformance requirement

Deflection Factor

Vertical

Horizontal

Overlay Mode
10-Eye Mode
Mag On

Jitter Display (WFM 601M)

Type Demodulated recovered clock
Digital Readout

Accuracy

Dynamic Range

Alignment Jitter 2.4 UI p-p
Timing Jitter 9.0 UI p-p

Resolution

Alignment Jitter 0.02 UI
Timing Jitter 0.1 UI

–3 dB Bandwidth

Alignment Jitter Bandwidth
selection

Timing JItter 10 Hz to 5 MHz

Jitter Waveform (WFM601M)

Accuracy

Dynamic Range 10 UI p-p

Deflection Factor

Horizontal Four modes available:

Vertical

X1
X5
X10

800 mV  5% with an 800 mV
p-p input

1 ns/div  3%
3 ns/div  3%
500 ps/div  3%

0.05 UI 10% of reading

10 Hz to 5 MHz
1 kHz to 5 MHz
10 kHz to 5 MHz
100 kHz to 5 MHz

 10%

1 Line, 2 Line
1 Field, 2 Field

1 UI/div 5%

0.2 UI/div 10%

0.1 UI/div 20%

Specifications

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

1–5

Specifications

T able 1–1: Electrical specifications (cont.)

Characteristic Reference informationPerformance requirement

–3 dB Bandwidths

Bandwidth Selection 10 Hz to 5 MHz

1 kHz to 5 MHz
10 kHz to 5 MHz
100 kHz to 5 MHz

Jitter Output

Signal Level & Cable Length Detector
(WFM 601E, WFM601M)

Cable Length

Accuracy
Resolution 5 meters
Dynamic Range 0 to 400 meters (Belden 8281 cable)

Source Signal Level

Accuracy

Resolution 0.25 dB
Dynamic Range

Cable Types Supported cable types:

Video Error Detection

Type Active picture and full field with field rate

Reporting Means Front-panel ALARM indicator , rear-panel TTL line,

Error Statistics Asynchronous errored seconds. Active picture and

Diagnostics

Embedded Audio Identifies the presence of up to 16 channels of

Ancillary Data Identifies the presence of ancillary data (other than

Bit Activity Indicates if any of the 10 data bits are always high

Line Rate Indicates whether the signal is 525 or 625 line.

120 mV/UI 10% into 75 W load

10 meters 10% of reading (Belden 8281 cable)

0.5 dB for cable lengths from 0–100 meters
(Belden 8281)

3 dB

Belden 8281
Belden 1694A
Belden 1505A

resolution. Uses EDH (Error Detection and
Handling) system based on CRC check-word.
Complies with SMPTE RP165.

and CRT readout

full field statistics are separately compiled

AES/EBU digital audio

audio and EDH) and indicates if a checksum error
has occurred.

or low during the active picture for an entire field.

1–6

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

T able 1–1: Electrical specifications (cont.)

Characteristic Reference informationPerformance requirement

Specifications

Format Errors
(WFM 601A, WFM601M)

Signal Lost Reports absence of the serial video signal.

Analog Audio Mode (WFM 601A)

Input DC coupled, differential input, 20 kW input

Full Scale Selection 0, 4, 8, and 12 dBu full scale, menu selectable
Full Scale Accuracy
Bandwidth

X and Y Input Phase Matching
Maximum Input Voltage ±8 V peak, measured to chassis ground

Digital Data Value Cursor and Listing
(WFM 601M)

Digital Waveform Non-interpolated waveform display . Cursor

Data Mode Displays interleaved data stream sequentially with

Video Mode Displays Y, Cb, Cr data streams separately.

Digital List Sequential list of sample values in table format.

External Reference

Input Analog composite video or black burst
Maximum Operating Input Voltage –1.8 V to +2.2 V, DC plus peak AC
Absolute Maximum Input Voltage –8.5 V to +8.5 V , DC plus peak AC
DC Input Impedance

$0.5 dB at 1 kHz
–3 dB w 500 kHz using a leveled

sine wave
v 1_, 20 Hz–20 kHz

Warns that a serial signal format error has
occurred for the following error types:

H SAV placed incorrectly relative to EA V.
H Line length error.
H Field length error.
H Reserved values used improperly.
H ANC data checksum error.
H ANC data parity error.

impedance

identifies selected sample value (hexadecimal,
decimal, binary). Cross-hair cursor inserted on
picture monitor output shows selected line and
sample. Vertical and horizontal shift of picture
monitor output when selecting blanking interval
line and sample values.

31 samples per screen width. Cursor identifies
selected sample value.

Channels are selected with VIDEO IN buttons.
Cursor identifies the selected sample value.

Cursor identifies selected sample. VIDEO mode
identifies samples as Y, Cb, Cr.

w 20 kW

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

1–7

Specifications

T able 1–1: Electrical specifications (cont.)

Characteristic Reference informationPerformance requirement

Return Loss

Waveform Horizontal Deflection

Sweep Internal Synchronization: Proper

horizontal and vertical synchro­nization with a component digital
signal conforming to CCIR Rec.
601/656 and SMPTE 125M.

External Synchronization: Proper
horizontal and vertical synchro­nization with a composite sync
signal of approximate line and field
rate.

Sweep Timing Accuracy

Sweep Linearity
Magnified Sweep Accuracy

Magnified Sweep Linearity
Timing Cursors
Horizontal Position Range Any portion of the synchronized

Calibrator

Waveform Square Wave

Component Vector Mode

Vertical Bandwidth
Horizontal to Vertical Bandwidth

Matching
Vertical Gain Accuracy
Horizontal Gain Accuracy
Display to Graticule Registration

Electronic Graticule Shape Minimal visible gaps or tails at corners of target

Vector Display PB is displayed on horizontal axis and PR is

1 Line: 5 ms/division $1%
2 Line: 10 ms/division $1%

$1%
1 Line: 0.2 ms/division $1%

2 Line: 1.0 ms/division $1%
$1%
Accuracy: $1% $0.5% over 20–30° C

sweep can be positioned on
screen in all sweep modes

Amplitude: 700 mV $1%
Frequency: 100 kHz $0.1%

v2° at 500 kHz and 2 MHz

$1%
$1%
v0.25 box with the color bar

black, display dot centered in
target

w40 dB to 6 MHz; typically w46 dB to 6 MHz,
w40 dB to 10 MHz

Sweep Length: [12 divisions
Sweep free runs without input

1 Field displays one full field, including field rate
sync. 2 Field displays two full fields and the field
rate sync between them.

Crystal-controlled 10 ms square wave

w1.0 MHz

boxes

displayed on vertical axis.

1–8

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

T able 1–1: Electrical specifications (cont.)

Characteristic Reference informationPerformance requirement

Lightning and Diamond Mode

Vertical Gain Accuracy
Electronic Graticule Display

Diamond GBR Deflection axis indicated

Lightning Y is displayed vertically

RGB Gamut Error Indication

Detection Level Positive detection level = 735 mV

Arrowhead Mode (NTSC/PAL Composite
Limit Display Mode)

Signal to Graticule Registration Color bar black is positioned in the center of

Signal to Graticule Accuracy
(PAL values in parenthesis)

Composite Limit Cursor Accuracy
(PAL values in parenthesis)

Composite Limit Detection Level
Accuracy (P AL values in parenthesis)

Bowtie Mode

Common Mode Rejection Ratio
Accuracy
Interchannel Timing Match

Picture Monitor Outputs

Signal Format EBU/N10 or RGB, menu selectable
Active Video Accuracy

Black (Blanking) Output Level
(WFM 601M)

Frequency Response
(WFM 601M)

Non-Linearity (WFM 601M)

$2%

"7 mV (nominally 105% of legal

RGB)
Negative Detection level = –35 mV

"7 mV

"2 IRE, 100 IRE and 131 IRE

("2, 700 mV)

Detection level = 102% "3% of
cursor level

700 mV $1% peak-to-peak
(Y -PB-PR mode)

0 mV "35 mV

PB is displayed horizontally on top half of display.
PR is displayed horizontally on bottom half of
display .

7.5 IRE box within v.25 box width.

"2% at 100, 110, 120, 131 IRE (700 and 950 mV)

Detection level can be set to 100, 110, 120, or 131
IRE (700 or 950 mV PAL)

w34 dB at 2.5 MHz
$3%
$2.0 ns

Typically < "2% for RGB mode

Y to 5.75 MHz: $1%
PB and PR to 2.75 MHz: $1%

v0.5%

Specifications

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

1–9