Tektronix DG2040 Service Manual
Service Manual
DG2040
Data Generator
071-0259-50
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 one (1) year 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 PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO
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
General Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting Tektronix xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Characteristics 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Certification and Compliances 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Information 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cord Information 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Environment 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse T ype and Rating 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Panel Controls 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applying and Interrupting Power 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repackaging Instructions 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Instructions 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Power On 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Diagnostics Routines 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Interface 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Elements 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menus 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pattern Storage and I/O 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading Files 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Output 2-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Module Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification
Before Running the Performance Tests 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T est Procedure Notes 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self Tests 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance T ests 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T est Record 4-43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedures
Adjustment Procedures 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DG2040 Service Manual
i
Table of Contents
Maintenance
Maintenance 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Cleaning 6-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Installation Procedures 6-7. . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 6-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Access Procedure 6-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Procedures for External Modules 6-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Procedures for Internal Modules 6-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 6-45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Procedures 6-45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DG2040 Data Generator Diagnostics 6-45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options and Accessories
Options 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Electrical Parts
Replaceable Electrical Parts 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams
Diagrams 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Mechanical Parts
Replaceable Mechanical Parts 10-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 10-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 10-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
DG2040 Service Manual
List of Figures
Table of Contents
Figure 1-1: Timing definition in edge control input 1-10. . . . . . . . . . . . . . .
Figure 1-2: Transfer function for edge control input 1-11. . . . . . . . . . . . . .
Figure 1-3: Signal timing 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-1: Rear panel power switch, fuse holder,
and connector 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-2: Location of the ON/STBY switch 2-6. . . . . . . . . . . . . . . . . . . .
Figure 2-3: Rear panel controls 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-4: Display elements 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-5: Load Data and Parameters menu 2-16. . . . . . . . . . . . . . . . . . .
Figure 2-6: Operating buttons and menu layout 2-17. . . . . . . . . . . . . . . . .
Figure 2-7: Output voltage level and delay time display 2-19. . . . . . . . . . .
Figure 4-1: Operating buttons and menu layout 4-4. . . . . . . . . . . . . . . . .
Figure 4-2: Diagnostics menu 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-3: Frequency measurement connections 4-8. . . . . . . . . . . . . . . .
Figure 4-4: Sequence & data output connections 4-11. . . . . . . . . . . . . . . . .
Figure 4-5: Sequence & data output timing chart 4-13. . . . . . . . . . . . . . . .
Figure 4-6: External reference input connections 4-15. . . . . . . . . . . . . . . .
Figure 4-7: Maximum operating frequency connections 4-18. . . . . . . . . . .
Figure 4-8: Maximum operating frequency (1) 4-20. . . . . . . . . . . . . . . . . .
Figure 4-9: Maximum operating frequency (2) 4-20. . . . . . . . . . . . . . . . . .
Figure 4-10: Maximum operating frequency (3) 4-21. . . . . . . . . . . . . . . . .
Figure 4-11: Maximum operating frequency connections 4-23. . . . . . . . . .
Figure 4-12: Maximum operating frequency (4) 4-25. . . . . . . . . . . . . . . . .
Figure 4-13: Maximum operating frequency (5) 4-25. . . . . . . . . . . . . . . . .
Figure 4-14: Internal trigger generator & external trigger input
connection 4-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-15: Edge control mode operation connection 4-30. . . . . . . . . . . .
Figure 4-16: Edge control mode 4-31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-17: Output level measurement connections 4-32. . . . . . . . . . . . . .
Figure 4-18: Clock output amplitude measurement connection 4-35. . . . .
Figure 4-19: Delay time measurement connection 4-39. . . . . . . . . . . . . . . .
Figure 4-20: Rise time and fall time measurement connection 4-42. . . . . .
DG2040 Service Manual
Figure 6-1: DG2040 Data Generator orientation 6-9. . . . . . . . . . . . . . . . .
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Table of Contents
Figure 6-2: Guide to removal procedures 6-10. . . . . . . . . . . . . . . . . . . . . . .
Figure 6-3: External modules 6-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-4: Internal modules 6-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-5: Front-panel knob removal 6-14. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-6: Line fuse and line cord removal 6-15. . . . . . . . . . . . . . . . . . . . .
Figure 6-7: Rear cover and cabinet removal 6-17. . . . . . . . . . . . . . . . . . . .
Figure 6-8: Front cover, trim ring, and menu button
removal (front cover not shown) 6-19. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-9: Front-panel module removal 6-21. . . . . . . . . . . . . . . . . . . . . . .
Figure 6-10: A12 keyboard removal 6-22. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-11: Front-panel module disassembly 6-23. . . . . . . . . . . . . . . . . . .
Figure 6-12: Connector module removal 6-26. . . . . . . . . . . . . . . . . . . . . . .
Figure 6-13: Fan and fan frame removal 6-27. . . . . . . . . . . . . . . . . . . . . . .
Figure 6-14: Rear shield cover removal 6-29. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-15: Power supply module removal 6-30. . . . . . . . . . . . . . . . . . . . .
Figure 6-16: AUX power board and AC inlet removal 6-32. . . . . . . . . . . .
Figure 6-17: Monitor module removal 6-34. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-18: CRT frame removal 6-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-19: A6 CPU board, A30 CPU Interface board
and A40 Clock board removal 6-37. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-20: A50 PG & Output board removal 6-39. . . . . . . . . . . . . . . . . .
Figure 6-21: A16 Back plane board removal 6-41. . . . . . . . . . . . . . . . . . . .
Figure 6-22: Battery location on the A16 Back plane board 6-43. . . . . . . .
Figure 6-23: Floppy-disk drive module removal 6-44. . . . . . . . . . . . . . . . .
Figure 6-24: A6 CPU Board 6-46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-25: Primary troubleshooting procedure 1 6-47. . . . . . . . . . . . . . .
Figure 6-26: Primary troubleshooting procedure 2 6-48. . . . . . . . . . . . . . .
Figure 6-27: Power Supply module troubleshooting procedure 6-49. . . .
Figure 6-28: AUX Power board 6-50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-29: Power Supply module 6-50. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-30: A6 CPU Board or front-panel module
troubleshooting procedure 6-51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-31: Key board 6-52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-32: Monitor module troubleshooting procedure 6-53. . . . . . . . . .
Figure 6-33: Monitor module 6-54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-34: Horizontal and vertical sync signals 6-54. . . . . . . . . . . . . . . .
Figure 6-35: A video signal with white and black levels 6-55. . . . . . . . . . .
Figure 6-36: A30 CPU Interface board, A40 Clock board
or A50 PG & Output board troubleshooting procedure 6-56. . . . . . . .
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DG2040 Service Manual
Table of Contents
Figure 6-37: Module isolation troubleshooting procedure 6-57. . . . . . . . .
Figure 9-1: DG2040 block diagram 9–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9-2: DG2040 interconnect diagram 9–4. . . . . . . . . . . . . . . . . . . . . .
Figure 10-1: Cabinet 10-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10-2: Main chassis and CRT 10-7. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10-3: Main chassis and circuit boards 10-9. . . . . . . . . . . . . . . . . . . .
Figure 10-4: Circuit boards 10-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10-5: Front panel assembly 10-13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
DG2040 Service Manual
v
Table of Contents
List of Tables
Table 1-1: Electrical characteristics 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-2: Period JItter 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-3: Cycle to Cycle JItter 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-4: Mechanical characteristics 1-8. . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-5: Environmental characteristics 1-8. . . . . . . . . . . . . . . . . . . . . .
Table 1-6: Certifications and compliances 1-12. . . . . . . . . . . . . . . . . . . . . .
Table 2-1: Power-cord conductor identification 2-2. . . . . . . . . . . . . . . . .
Table 2-2: Power cord identification 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2-3: Fuse and fuse cap part numbers 2-4. . . . . . . . . . . . . . . . . . . . .
Table 2-4: AC line power requirements 2-4. . . . . . . . . . . . . . . . . . . . . . . .
Table 2-5: DG2040 Data Generator display elements 2-14. . . . . . . . . . . . .
Table 4-1: Performance check disk files 4-2. . . . . . . . . . . . . . . . . . . . . . . .
Table 4-2: Required equipment 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4-3: Error codes 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4-4: Internal clock frequency accuracy 4-10. . . . . . . . . . . . . . . . . . .
Table 4-5: High level output voltage accuracy 4-34. . . . . . . . . . . . . . . . . .
Table 4-6: Low level output voltage accuracy 4-34. . . . . . . . . . . . . . . . . . .
Table 4-7: Clock output voltage accuracy 4-37. . . . . . . . . . . . . . . . . . . . . .
Table 4-8: Rise and fall time accuracies 4-43. . . . . . . . . . . . . . . . . . . . . . .
Table 4-9: DG2040 test record 4-44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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: Equipment required 6-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7-1: International Power Cords 7-1. . . . . . . . . . . . . . . . . . . . . . . . .
Table 7-2: Standard accessories 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7-3: Optional accessories 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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DG2040 Service Manual
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. 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.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
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.
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.
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.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
DG2040 Service Manual
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
vii
General Safety Summary
Symbols and Terms
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 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) Terminal
CAUTION
Refer to Manual
Double
Insulated
viii
DG2040 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 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 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.
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.
DG2040 Service Manual
ix
Service Safety Summary
x
DG2040 Service Manual
Introduction
This manual contains information needed to properly service the DG2040 Data
Generator, as well as general information critical to safe and effective servicing.
To prevent personal injury or damage to the DG2040 Data Generator, consider
the following before attempting service:
H The procedures in this manual should be performed only by a qualified
service person
H Read the General Safety Summary and the Service Safety Summary,
beginning on page vii
H Read the Operating Information section beginning on page 2-1
When using this manual for servicing be sure to follow all warnings, cautions,
and notes.
Performance Verification Interval
Generally, the performance verification should be done every 12 months and is
recommended after the replacement of a module.
Strategy for Servicing
If the DG2040 Data Generator does not meet performance criteria, repair is
necessary.
This manual contains all the information needed for periodic maintenance of the
DG2040 Data Generator. (Examples of such information are procedures for
checking performance.)
Further, the manual contains all information for corrective maintenance at the
module level. To isolate a failure to a module, use the troubleshooting procedures found in Maintenance:Troubleshooting section, beginning on page 6-1. To
remove and replace any failed module, follow the instructions in the Mainte-
nance:Removal and Installation Procedures beginning on page 6-15. After
isolating a faulty module, replace it with a fully-tested module obtained from
your local Tektronix distributor or sales office. The Replaceable Mechanical
Parts section, beginning on page 10-1, contains part number and ordering
information for all replaceable modules.
DG2040 Service Manual
xi
Introduction
Tektronix 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 are well trained to service the DG2040 Data
Generator. They have access to the latest information on improvements to the
DG2040 Data Generator as well as the latest new options.
Warranty Repair Service
Self Service
Tektronix warrants this product for one year from date of purchase. The warranty
appears on the back of the title page in this manual. Tektronix technicians
provide warranty service at most Tektronix service locations. The Tektronix
product catalog lists all worldwide service locations.
Tektronix supports repair to the module level by providing Module Exchange.
Module Exchange. This service reduces down-time for repair by allowing you to
exchange most modules for remanufactured ones. 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.
xii
DG2040 Service Manual
Preface
Manual Structure
This is the service manual for the DG2040 Data Generator. The manual contains
information needed to service the data generator to the module level.
This manual is divided into sections, such as the Specification and Theory of
Operation. Some sections are 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. Following is a brief description of each
manual section.
H The Specification section contains a description of the DG2040 Data
Generator and the characteristics that apply to it.
H The Operating Information section includes general information and
operating instructions.
H The Theory of Operation section contains circuit descriptions that support
service to the module level.
H The Performance Verification section contains procedures to verify that the
DG2040 Data Generator functions properly and meets warranted limits.
H The Adjustment Procedure section contains a statement explaining that no
adjustment is needed for the DG2040 Data Generator.
H The Maintenance section contains information and procedures to perform
preventive and corrective maintenance of the DG2040 Data Generator. These
instructions include cleaning, module removal and installation, and fault
isolation to the module.
H The Options section contains information for servicing factory-installed
options.
H The Replaceable Electrical Parts section contains a statement that refers you
to the Replaceable Mechanical Parts. Both the electrical and mechanical
replaceable parts are listed in the mechanical section.
H The Diagrams section contains block diagrams and an interconnect diagram.
H The Replaceable Mechanical Parts. section includes a table of all replace-
able modules, their descriptions, and their Tektronix part numbers.
DG2040 Service Manual
xiii
Preface
Manual Conventions
This manual uses certain conventions that you should become familiar with.
Some sections of the manual contain procedures for you to perform. To keep
those instructions clear and consistent, this manual uses the following
conventions:
H Names of front panel controls and menus appear in the same case (initial
capitals, all uppercase, etc.) in the manual as is used on the DG2040 Data
Generator front panel and menus. Front panel names are all upper-case
letters; for example, SETUP MENU, HARDCOPY, etc.
H Instruction steps are numbered unless there is only one step.
Modules
Safety
Throughout this manual, any replaceable component, assembly, or part of the
DG2040 Data Generator is referred to generically as a module. In general, a
module is an assembly (like a circuit board), rather than a component (like a
resistor or an integrated circuit). Sometimes a single component is a module. For
example, the chassis of the DG2040 Data Generator is a module.
Symbols and terms related to safety appear in the Safety Summary near the
beginning of this manual.
Finding Other Information
Other documentation for the DG2040 Data Generator includes:
H The DG2040 Data Generator User Manual contains a tutorial that explains
H The DG2040 Data Generator Programmer Manual explains how to use a
how to operate the DG2040 Data Generator. Also included is instructions
explaining how to use other DG2040 Data Generator features.
GPIB or RS-232 interface to remotely control the DG2040 Data Generator.
xiv
DG2040 Service Manual
Contacting Tektronix
Preface
Phone 1Ć800Ć833Ć9200*
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 1Ć800Ć833Ć9200, select option 1*
Service support 1Ć800Ć833Ć9200, select option 2*
Technical support Email: techsupport@tektronix.com
1Ć800Ć833Ć9200, select option 3*
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.
DG2040 Service Manual
xv
Preface
xvi
DG2040 Service Manual
Product Overview
The DG2040 Data Generator is a portable digital data generator designed for
high performance and ease of use. The DG2040 Data Generator is easy to use for
testing and evaluating semiconductors and logic circuits, which are continually
becoming faster and more complex. The DG2040 Data Generator provides high
performance and a wide range of functions in a compact package.
Main Features
Following are the main features of the DG2040 Data Generator :
H Maximum data rate of 1.1 GHz
H 256 K word pattern memory
H Flexible sequence looping (which does the equivalent of over a billion word
H Two channels (Complementary)
H For each output channel:
patterns)
H Variable output levels (from –1.125 to +3.5 V, into 50 W)
H Edge Control function (CH0 only)
H Delay setting (–1.0 ns to +2.0 ns, 10 ps resolution)
H Serial/Parallel pattern editing
Any memory size from 360 words to 256 K words can be used easily with no
restrictions within that range. Either of the two bit data channels can be assigned
to any output channel. The output channels support setting of high and low
output voltage levels, and delay time. CH0 supports edge position.
The DG2040 Data Generator also provides a 4000-step sequence controller,
which enables the generation of not only a data pattern longer than the pattern
memory but also dynamic pattern change triggered by external events.
The DG2040 Data Generator provides flexible data editing functions, including
word and line unit input and extended data creation functions. The DG2040 Data
Generator also provides functions that are required for system construction, such
as a sequencing function which is a jump function using external input.
DG2040 Service Manual
1Ć1
Product Overview
Applications
Following are some of the DG2040 Data Generator applications:
H Supports subassembly and system testing by simulating the digital signals
from incomplete sections of a product
H Performs margin tests by using the DG2040 Data Generator to generate
patterns that have a low probability of occurrence or are difficult to generate
H Constructs interactive digital simulation systems by using the sequence
output, external jump, and tristate control functions
H Uses flexible data output functions to make the DG2040 Data Generator an
ideal data generator for simulation of semiconductor devices and drivers
specific to serial data communication and all types of digital circuits
H Performs various timing analysis and jitter/wander tests by using the edge
control function to generate jitter on all the edges or selected edge(s)
1Ć2
DG2040 Service Manual
Specifications
General Characteristics
This section describes the general characteristics of the DG2040 Data Generator.
All specifications are guaranteed unless labeled “typical”. Typical specifications
are provided for your convenience but are not guaranteed. Specifications marked
with the √ symbol are checked in the performance verification procedure
beginning on page 4-1.
The certification and compliances for the DG2040 Data Generator are found at
the end of this appendix.
Performance Conditions
Table 1Ć1: Electrical characteristics
Characteristics Description
Operation mode
Repeat Pattern data is repeatedly output. When a sequence is specified, patterns are repeated
Single Pattern data is output only once. When a sequence is specified, a trigger signal outputs
Step Pattern data is output based on the clock, not specified by the clock source, but generated by
Enhanced Pattern data is output completely according to a sequence. All extended sequence functions,
1
The electrical characteristics are valid under the following conditions:
H The instrument must be in an environment with temperature, altitude,
humidity, and vibration within the operating limits described in these
specifications.
H The instrument must have had a warm-up period of at least 20 minutes.
H The instrument must have been calibrated and adjusted at an ambient
temperature between +20
H The instrument must be operating at an ambient temperature between
+10_ C to +40_ C, unless otherwise noted.
according to the sequence order. The extended sequence functions such as trigger wait, event
jump, and so on are ignored in this mode.
according to the sequence order.
pressing the STEP/EVENT button on the front panel. This mode is the same as the Repeat
mode except for the clock.
such as trigger wait, and event jump, are valid in this mode. This mode is the same as the
Repeat mode except for the extended sequence functions.
_ C and +30_ C.
DG2040 Service Manual
1Ć3
Appendix A: Specifications
Table 1Ć1: Electrical characteristics (Cont.)
Characteristics Description
Output pattern
Pattern length 360 to 262144 points
Number of channels 2 Channels, Complementary
Sequence Maximum 4000 steps
Number of blocks Maximum 256
Internal trigger generator
Internal trigger rate
Range 1.0 ms to 10.0 s
Resolution 3 digits, 0.1 ms min.
Accuracy ± 0.01 %
Clock generator
√ Internal clock
Frequency 0.1 Hz to 1.1 GHz
Resolution 7 digits
Accuracy ± 0.0001 %, 1 year after shipment from factory
Data and clock out
Connectors CH0, CH0, CH1, CH1. (SMA connectors at front panel)
√ Output voltage
Accuracy
Maximum Output Current ± 100 mA
Aberration
Overshoot
Undershoot
√ Rise/fall time (20% to 80%)
√ Channel skew
1, 2
CLOCK OUT, CLOCK OUT
(SMA connector at rear panel)
All outputs are complementary.
DC (data out) (± 3 % of setting) ± 50 mV (into 50 W)
Amplitude (clock
(± 5 % of setting) ± 50 mV (into 50 W)at1MHz
out)
t 5%at1.5V
t 5%at1.5V
t 150 ps at 1 V
at 10 MHz
pĆp
at 10 MHz
pĆp
at 10 MHz, measured with a 0.5 m (20 inches), 50 W cable. See Optional
pĆp
Accessories on page 7Ć3 for details.
t ± ( | 25° C-Ta| × 15 ps ± 100 ps), where Tais the ambient temperature °C.
1Ć4
At 10 MHz, 1.0 V high, 0 V low, in Repeat Mode, the pattern is Clock except when using the
Edge Control function.
DG2040 Service Manual
Appendix A: Specifications
Table 1Ć1: Electrical characteristics (Cont.)
Characteristics Description
Period jitter Measured by TDS694C-1MHD with TDSJIT1
(typical) Refer to Table 1Ć2.
Cycle to cycle jitter Measured by TDS694C-1MHD with TDSJIT1
(typical) Refer to Table 1Ć3.
√ Delay function
Delay channel CH0 (CH0), and CH1 (CH1),
Delay time -1.0 ns to +2.0 ns
Resolution 10 ps
Accuracy
Output impedance (typical) 50 W
Output voltage
High level (VOH) -1.75 V to +7.00 V (into 1 MW)
Low level (VOL) -2.25 V to +6.50 V (into 1 MW)
Resolution 10 mV (into 1 MW)
Voltage swing (VOH-VOL) 0.5 V to 5 V (into 1 MW)
Event input
Connector BNC at rear panel
Threshold level -5.0 V to +5.0 V, +1.4 V at default
Resolution 0.1 V
Input impedance (typical) 1kW
Turning point for event jump 230.5 to 254.5 clocks before the next block. Refer to Tacin Figure 1Ć3 on page 1Ć11.
Maximum input voltage ± 5V
Polarity Positive (rising edge)
Minimum pulse width
Sensitivity
t(± 3 % of setting) ± |25° C-Ta| × 15 ps ± 100 ps, where Tais the ambient temperature °C.
At 10 MHz, 1.0 V high, 0 V low, in Repeat Mode, the pattern is Clock except when using the
Edge Control function.
-0.875ĂV to +3.5 V (into 50 W)
-1.125 V to +3.25 V (into 50 W)
5 mV (into 50 W)
0.25 V
pĆp
to 2.5 V
(into 50 W)
pĆp
y 100 ns
y 1.0 V
pĆp
DG2040 Service Manual
1Ć5
Appendix A: Specifications
Table 1Ć1: Electrical characteristics (Cont.)
Characteristics Description
Event output
Connector BNC at rear panel
Level
High level (Vhi) Approximately5Vinto1MW
Approximately 2.5 V into 50 W
Low level (Vlo) Approximately 0 V into both 1 MW and 50 W
Delay time 194.5 to 214.5 clocks before data output change. Refer to Td5in Figure 1Ć3 on page 1Ć11.
Pulse width 180 to 200 clocks. Refer to PW2in Figure 1Ć3 on page 1Ć11.
Impedance 50 W
Sync output
Connector BNC at rear panel
Level (typical)
High level (VOH) Approximately 5 V (into 1 MW)
Approximately 2.5 V (into 50 W)
Low level (VOL) Approximately 0 V (into both 1 MW and 50 W)
Trigger Input (typical)
Delay time from external trigger
input signal (typical)
Delay time to clock out and
data out (typical)
Pulse width (typical) 32 or 36 clocks. Refer to PW1in Figure 1Ć3 on page 1Ć11.
Impedance (typical) 50 W
Trigger input
Connector BNC at front panel
Threshold level -5.0 V to +5.0 V, +1.4 V at default
Resolution 0.1 V
Threshold accuracy (± 5 % of setting) ± 0.1 V
Minimum pulse width
Sensitivity
Impedance 50 W ± 2 W
Polarity Positive or Negative
Maximum input ± 10Vinto1kW
Trigger holdoff Minimum 100 ns
55 ns + 8/F
x Td1x 55 ns + 12/F
clk (GHz)
clk (GHz)
(Typical)
Internal Reference. Refer to Td1in Figure 1Ć3 on page 1Ć11.
1.5 Clocks, Refer to Td2in Figure 1Ć3 on page 1Ć11.
y 10 ns
y 0.5 V
pĆp
1kW ± 100 W
± 5 V into 50 W
1Ć6
DG2040 Service Manual
Table 1Ć1: Electrical characteristics (Cont.)
Characteristics Description
Reference 10 MHz clock input
Connector BNC at front panel
Input voltage range 0.2 V to 3.0 V
Input voltage level
"Ă10 V Max
Impedance 50 W, AC Coupling
FrequencyĂRange 10ĂMHzñĂ0.1ĂMHz
Edge control input
Connector BNC at front panel
Voltage Range (typical) -Ă1Vto+1V
Input Impedance (typical) 50ĂW
Frequency Range (typical) DC to less than 500 MHz (-3 dB)
Transfer Function (typical) See Figure 1Ć2 on page 1Ć11.
Display
Display area Width: 13.2 cm (5.2 inches)
Height: 9.9 cm (3.9 inches)
Resolution Horizontal: 640 pixels
Vertical: 480 pixels
AC line power
Rating Voltage 100Ć240 V AC
Voltage Range and
Frequency Range
90Ć250 V AC, Input voltage frequency range is 48 Hz to 63 Hz
90Ć127 V AC, Input voltage frequency range is 48 Hz to 440 Hz
Maximum power 300 W
Maximum current 4A
Fuse rating 6A FAST, 250 V, UL 198G ( 3AG )
pĆp
Appendix A: Specifications
5A(T),250V,IEC127
1
Clock outputs continuously regardless of the operation mode.
2
The data output duty cycle varies from 3:7 to 7:3 at 1.0 V
pĆp
clock continuously outputs regardless of the run mode or sequence.
DG2040 Service Manual
during the 10 ms just after the output has been started. The
1Ć7
Appendix A: Specifications
Table 1Ć2: Period JItter
Clock frequency 1.1 GHz 800 MHz
Measurement StdDev Pk-Pk StdDev Pk-Pk
Clock output 3.0 ps 16 ps 3.0 ps 13 ps
CH0 output 3.5 ps 20 ps 3.5 ps 20 ps
Table 1Ć3: Cycle to Cycle JItter
Clock frequency 1.1 GHz 800 MHz
Measurement StdDev Pk-Pk StdDev Pk-Pk
Clock output 5.0 ps 28 ps 4.0 ps 22 ps
CH0 output 5.5 ps 32 ps 5.5 ps 32 ps
Table 1Ć4: Mechanical characteristics
Characteristics Description
Net weight
Standard 10.3 kg (22.7 lb)
Dimensions
Height 164 mm (6.4 inches) including feet
Width 362 mm (14.3 inches) including handle
Length 491 mm (19.25 inches) including front cover
576 mm (22.2 inches) with handle extended
Table 1Ć5: Environmental characteristics
Characteristics Description
Temperature
Operating +10_ Cto+40_ C
Nonoperating -20_ Cto+60_ C
Relative humidity
Operating 20% to 80% (No condensation)
Maximum wetĆbulb temperature 29.4_ C
Nonoperating 5% to 90% (No condensation)
Maximum wetĆbulb temperature 40.0_ C
1Ć8
DG2040 Service Manual
Table 1Ć5: Environmental characteristics (Cont.)
Characteristics Description
Altitude
Operating To 4.5 km (15,000 feet).
Maximum operating temperature decreases 1 _C each 300 m above 1.5 km.
Nonoperating To 15 km (50,000 feet).
Dynamics
Vibration
Operating 0.27 G
Nonoperating 2.28 G
Shock
Nonoperating 294 m/s2(30 G), halfĆsine, 11 ms duration.
Three shocks per axis in each direction (18 shocks total)
Installation requirements
Power consumption 300 watts maximum. Maximum line current is 4 A
Dissipation (fully loaded) 90 V line, with 5% clipping
Surge current
x 9 A peak for less than 5 line cycles at 25_ C after product has been off for at least 30 s.
Cooling clearance
Top clearance 2.5 cm (1 inch)
Side clearance 15 cm (6 inches)
Rear clearance 7.5 cm (3 inches)
, 5 to 500 Hz
rms
, 5 to 500 Hz
rms
rms
Appendix A: Specifications
at 50 Hz
DG2040 Service Manual
1Ć9
Appendix A: Specifications
Controlled Edge
CH0 Pattern
CH1 Pattern
CH0 Output
11
00 00
11
000000
ntr
The rising edge moves to the right and falling edge moves to the left, when the
position offset is set to more than 0 ps or when the edge control input is more
than 0V.
Controlled Edge
00
ntf
Figure 1Ć1: Timing definition in edge control input
1Ć10
DG2040 Service Manual
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