Sony Tektronix WFM 1125 User manual

Service Manual
WFM 1125
Digital Television Waveform Monitor
Option 0A/0B/0C/0D
071-0455-04
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 ESony/Tektronix Corporation. All rights reserved.
Copyright ETektronix, 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.
Printed in Japan
Sony/Tektronix Corporation, P.O. Box 5209, Tokyo Int’l, Tokyo 100–31 Japan
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
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 one (1) year from the date of shipment. If a product proves defective during this warranty period, Tektronix,
at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in
exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction
caused by the use of non-Tektronix supplies; or d) to service a product that has been modified or integrated with other
products when the effect of such modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO
REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO
THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE
LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE
OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.

Service Assurance
If you have not already purchased Service Assurance for this product, you may do so at any time during the product’s
warranty period. Service Assurance provides Repair Protection and Calibration Services to meet your needs.
Repair Protection extends priority repair services beyond the product’s warranty period; you may purchase up to three
years of Repair Protection.
Calibration Services provide annual calibration of your product, standards compliance and required audit documentation,
recall assurance, and reminder notification of scheduled calibration. Coverage begins upon registration; you may purchase
up to five years of Calibration Services.
Service Assurance Advantages
HPriced well below the cost of a single repair or calibration
HAvoid delays for service by eliminating the need for separate purchase authorizations from your company
HEliminates unexpected service expenses
For Information and Ordering
For more information or to order Service Assurance, contact your Tektronix representative and provide the information
below. Service Assurance may not be available in locations outside the United States of America.
Name VISA or Master Card number and expiration
Company date or purchase order number
Address Repair Protection (1,2, or 3 years)
City, State, Postal code Calibration Services (1,2,3,4, or 5 years)
Country Instrument model and serial number
Phone Instrument purchase date

WFM 1125 Option 0A/0B/0C/0D Service Manual i
Table of Contents
General Safety Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Characteristics 1–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Characteristics 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety and EMI 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Information
Operating Information 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation for Use 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supplying Operating Power 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Environment 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applying and Interrupting Power 2–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repackaging Instructions 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installed Options 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Menus 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bezel Menu 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure Menu 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIAG/CAL Menu 2–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Operation 2–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS–232C Connector 2–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Connector 2–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Theory of Operation 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A15 Relay & Sync board 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A10 Input board 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A20 Main board 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A40 CPU board 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A30 Front Panel board 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A60 DC-DC board 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A5 DISPLAY board 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
ii WFM 1125 Option 0A/0B/0C/0D Service Manual
erformance Verification
Performance Verification 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Running the Performance Tests 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Equipments 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Tests 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment rocedure
Adjustment Procedures 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements for Performance 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Required 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Adjustment 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Adjustment 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Adjustment 5–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
Maintenance 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Maintenance Procedures 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Cleaning 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Installation Procedures 6–7. . . . . . . . . . . . . . . . . . . . . . . . . .
Firmware Updates 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floppy disks 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Update Procedure 6–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 6–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostics 6–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options
Options and Accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 0A Description 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 0B Description 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 0C Description 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical arts List
Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams
Diagrams 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical arts List
Mechanical Parts List 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
WFM 1125 Option 0A/0B/0C/0D Service Manual iii
List of Figures
Figure 2–1: Dimensions of the 1700F00 plain cabinet 2–4. . . . . . . . . . . . .
Figure 2–2: 1700F02 portable cabinet 2–5. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: Rear view of the waveform monitor in a 1700F02
cabinet 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–4: The 1700F05 rack cabinet holds two instruments 2–7. . . . . .
Figure 2–5: 1700F05 cabinet showing utility drawer and blank panel 2–8
Figure 2–6: Elements of the WFM 1125 menu controls 2–13. . . . . . . . . . . .
Figure 2–7: DIAG/CAL menu structure 2–15. . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–8: Pin assignments for the RS-232C connector 2–17. . . . . . . . . .
Figure A–1: Pin assignments for the REMOTE connector 2–19. . . . . . . . .
Figure 4–1: Ground closer with 15-pin D-type connector 4–3. . . . . . . . . .
Figure 4–2: Performance test initial hookup 4–6. . . . . . . . . . . . . . . . . . . .
Figure 4–3:Analog output test initial hookup 4–13. . . . . . . . . . . . . . . . . . .
Figure 4–4:Audio output test initial hookup 4–16. . . . . . . . . . . . . . . . . . . .
Figure 4–5: External reference test initial hookup 4–18. . . . . . . . . . . . . . . .
Figure 4–6: External reference test initial hookup 4–20. . . . . . . . . . . . . . . .
Figure 4–7: Monitor output test initial hookup 4–24. . . . . . . . . . . . . . . . . .
Figure 5–1: Rear view of the waveform monitor in a enclosure 5–2. . . . .
Figure 5–2:A5 display board view from top of the waveform
monitor 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–3:A5 display board view from top of the waveform
monitor (J310171 and above) 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–4:A10 input board view 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–5:A40 CPU board view and test points 5–11. . . . . . . . . . . . . . . . .
Figure 5–6: Power supply module view and VR501 5–12. . . . . . . . . . . . . .
Figure 6–1: RS-232C cable with 9-pin, D-type connectors 6–9. . . . . . . . .
Figure 6–2:A60 DC-DC board (view from top) 6–24. . . . . . . . . . . . . . . . . .
Figure 6–3:A20 Main board (view from top) 6–27. . . . . . . . . . . . . . . . . . . .
Figure 6–4: J100 and J110 connector pin configurations 6–29. . . . . . . . . .
Figure 9–1: Interconnections 9–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–2: Block diagram 9–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–3:A20 Main board block diagram 9–4. . . . . . . . . . . . . . . . . . . . .
Figure 10–1: WFM 1125 Digital Television Waveform Monitor
exploded view 10–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
iv WFM 1125 Option 0A/0B/0C/0D Service Manual
List of Tables
Table 1–1: Vertical deflection system 1–3. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: Horizontal deflection system 1–4. . . . . . . . . . . . . . . . . . . . . . . .
Table 1–3: Serial digital video interface 1–7. . . . . . . . . . . . . . . . . . . . . . . .
Table 1–4: Analog Output 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–5: Stripped AES/EBU digital audio output 1 1–7. . . . . . . . . . . .
Table 1–6: External reference input 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–7: Format display 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–8: Field rate display 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–9: RBG transcoder 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–10: Component vector mode 1–10. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–11: Lightning and diamond mode 1–10. . . . . . . . . . . . . . . . . . . . . .
Table 1–12: Bowtie mode 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–13: Status display mode 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–14: Save and display mode 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–15: Warning display 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–16: Calculation dynamic range 1–12. . . . . . . . . . . . . . . . . . . . . . . .
Table 1–17: Setup memory 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–18: CRT display 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–19:AC power source 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–20: Installation requirements 1–13. . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–21: Environmental characteristics 1–14. . . . . . . . . . . . . . . . . . . . .
Table 1–22: Physical characteristics 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–23: Certifications and compliances2 1–15. . . . . . . . . . . . . . . . . . .
Table 2–1: Power-cord conductor identification 2–9. . . . . . . . . . . . . . . . .
Table 2–2: Effects of corrupted data 2–11. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–3: Remote connector pin assignments and functions 2–19. . . . . .
Table 4–1: Required equipment 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 5–1: Required equipment 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–1: Relative susceptibility to static-discharge damage 6–3. . . . . .
Table 6–2: External inspection check list 6–4. . . . . . . . . . . . . . . . . . . . . . .
Table 6–3: Internal Inspection check list 6–5. . . . . . . . . . . . . . . . . . . . . . .
Table 6–4: Required equipment 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–5: Floppy disk’s file list 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–1: Standard accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–2: Optional accessories 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WFM 1125 Option 0A/0B/0C/0D Service Manual v
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Use roper ower Cord. Use only the power cord specified for this product and
certified for the country of use.
Ground the roduct. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
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.
rovide roper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
To Avoid Fire or
ersonal Injury

General Safety Summary
vi WFM 1125 Option 0A/0B/0C/0D Service Manual
Terms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Terms on the roduct. 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 roduct. The following symbols may appear on the product:
Protective Ground
(Earth) Terminal
CAUTION
Refer to Manual
Double
In ulated
WARNING
High Voltage
Symbols and Terms

WFM 1125 Option 0A/0B/0C/0D Service Manual vii
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 ower. To avoid electric shock, disconnect the mains 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 ower 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.
XĆRadiation. 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
viii WFM 1125 Option 0A/0B/0C/0D Service Manual

WFM 1125 Option 0A/0B/0C/0D Service Manual ix
reface
This document supports serial number J310000 and above.
This preface contains information needed to properly use this document to
service the WFM 1125 Digital Television Waveform Monitor Option
0A/0B/0C/0D, as well as general information critical to safe and effective
servicing of this waveform monitor. This manual applies to any instrument with
serial number J310101 and above.
Document Structure
This document is divided into sections, such as Specification 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
document section.
HSpecification contains a product description of the WFM 1125 Digital
Television Waveform Monitor Option 0A/0B/0C/0D and tables of the
characteristics and descriptions that apply to it.
HOperating Information includes general information and operating instruc-
tions at the level needed to safely power on and service this waveform
monitor. A statement of the service strategy that this document supports, and
instructions for shipment of the waveform monitor are found in this section.
HTheory of Operation contains circuit descriptions that support general service
and fault isolation down to the module level.
HPerformance Verification contains a collection of procedures for confirming
that these waveform monitor function properly and meet warranted limits.
HAdjustment Procedures contains a collection of procedures for adjusting
these waveform monitor to meet warranted limits.
HMaintenance contains information and procedures for doing preventive and
corrective maintenance of these waveform monitor. Instructions for cleaning,
for firmware updates, and for fault isolation to a module are found here.
HOptions contains information on servicing any of the factory-installed
options that may be present in your waveform monitor.

Preface
xWFM 1125 Option 0A/0B/0C/0D Service Manual
HElectrical Parts List contains a statement referring you to Mechanical
Replaceable Parts, where both electrical and mechanical modules are listed.
HDiagrams contains a block diagram and an interconnection diagram useful
for isolating failed modules.
HMechanical Parts List includes a table of all replaceable modules, their
descriptions, and their Tektronix part numbers, as well as the exploded view.
Document Conventions
This document uses certain conventions which you should become familiar with
before doing service.
Throughout this manual, any replaceable component, assembly, or part of these
waveform monitor 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, each
chassis part of the waveform monitor is a module.
Symbols and terms related to safety appear in the Safety Summary found at the
beginning of this document.
Besides the symbols related to safety, this document uses the following symbols:
STOP. The stop labels information which must be read in order to correctly do
service and to avoid incorrectly using or applying service procedures.
Related Manual
The WFM 1125 Digital Television Waveform Monitor Option 0A/0B/0C/0D
come with the following manual:
WFM 1125 Option 0A/0B/0C User Manual (Tektronix part number
071-0260-XX) contains information for operation the WFM 1125 Digital
Television Waveform Monitor Option 0A/0B/0C/0D.
Modules
Safety
Symbols

WFM 1125 Option 0A/0B/0C/0D Service Manual xi
Introduction
Service Strategy
STOP. Throughout this document, any field-replaceable component, assembly, or
part of this waveform monitor is referred to generically as a module.
This document contains all the information needed for periodic maintenance of
the WFM 1125 Digital Television Waveform Monitor Option 0A/0B/0C/0D.
(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
fresh unit obtained from the factory.
All modules are listed in Mechanical Parts List.To isolate a failure to a module,
use the fault isolation procedures found in Section 6, Maintenance.
Service Offerings
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 WFM 1125 Digital Television Waveform Monitor
Option 0A/0B/0C/0D. Tektronix technicians are appraised of the latest informa-
tion on improvements to the product as well as the latest new options to the
product.
Tektronix warrants this product for one year from date of purchase. 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 WFM 1125 Digital Television Waveform Monitor Option 0A/0B/0C/0D to
fit your requirements.
AtĆDepot Service. Tektronix offers several standard-priced adjustment (calibra-
tion) and repair services:
Warranty Repair Service
Repair or Calibration
Service

Introduction
xii WFM 1125 Option 0A/0B/0C/0D Service Manual
HA single repair and/or adjustment.
HCalibrations using equipment and procedures that meet the traceability
standards specific to the local area.
HAnnual maintenance agreements that provide for either calibration and repair
or calibration only of the waveform monitor.
Of these services, the annual maintenance agreement offers a particularly
cost-effective approach to service for many owners of the WFM 1125 Digital
Television Waveform Monitor Option 0A/0B/0C/0D. Such agreements can be
purchased to span several years.
OnĆSite Service. The annual maintenance agreement can be purchased with
on-site service, with repair and calibration done at your facility. This service
reduces the time your waveform monitor is out of service when calibration or
repair is required.
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.
Module Repair and Return. This service returns to you within 10 days the same
module that you shipped to Tektronix. The module shipped is repaired, tested,
and returned to you from the Beaverton, Oregon service center. It is not updated
to match current modules of the same type. Again, 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.
Self Service

Introduction
WFM 1125 Option 0A/0B/0C/0D Service Manual xiii
Before You Begin
This document is for servicing the WFM 1125 Digital Television Waveform
Monitor Option 0A/0B/0C/0D. To prevent injury to yourself or damage to the
waveform monitor, do the following tasks before you attempt service:
HBe sure you are a qualified service person.
HRead the Safety Summary found at the beginning of this document.
HRead Service Strategy in this section and Supplying Operating Power in
section 2.
When using this document for servicing, be sure to heed all warnings, cautions,
and notes.

Introduction
xiv WFM 1125 Option 0A/0B/0C/0D Service Manual