Tektronix DG2020A User manual

Service Manual
DG2020A
Data Generator
071-0055-52
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
www.tektronix.com

Copyright ©Tektronix, Inc. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
HIn North America, call 1--800--833--9200.
HWorldwide, visit www.tektronix.com to find contacts in your area.In North America, call 1--800--833--9200.

WARRANTY
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year
from the date of shipment. If any such 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; or c) to service a product that has been
modified or integrated with other products when the effect of such modification or integration increases the time or
difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE 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.

DG2020A Service Manual i
Table of Contents
General Safety Summary vii...................................
Service Safety Summary ix....................................
Preface xi...................................................
Introduction xiii..............................................
Specifications
Product Description 1-1........................................
Features 1-1........................................................
Performance Characteristics 1-3................................
Warranted Characteristics 1-4..........................................
Typical Characteristics 1-9............................................
Nominal Traits 1-11..................................................
Certification and Compiances 1-16......................................
Operating Information
Preparation for Use 2-1........................................
Supplying Power 2-1.................................................
Power Cord Information 2-2...........................................
Operating Environment 2-3...........................................
Rear Panel Controls 2-3..............................................
Fuse Type and Rating 2-4.............................................
Applying and Interrupting Power 2-5....................................
Repackaging Instructions 2-6..........................................
Installed Options 2-6.................................................
Operating Instructions 2-7.....................................
How to Make Connection to Pods 2-7...................................
How to Power On 2-9................................................
Internal Diagnostics Routines 2-9......................................
User Interface 2-9...................................................
Display 2-11........................................................
Menus 2-13.........................................................
Pattern Storage and I/O 2-13...........................................
Loading Files 2-14...................................................
Signal Output 2-15...................................................
Theory of Operation
Theory of Operation 3-1.......................................
Module Overview 3-1................................................
Options 3-3........................................................
Performance Verification
Performance Verification 4-1...................................
Introduction 4-1....................................................

Table of Contents
ii DG2020A Service Manual
Before Running the Operation Tests 4-2.................................
Test Procedure Notes 4-4.............................................
Self Tests 4-5.......................................................
Performance Tests for the DG2020A/Pod Combination 4-6..................
P3410 Pod Performance Test 4-17.......................................
P3420 Pod Performance Test 4-24.......................................
Adjustment Procedure
Adjustment Procedures 5-1.....................................
Maintenance
Maintenance 6-1..............................................
Preparation 6-1.....................................................
Inspection and Cleaning 6-4...........................................
Removal and Installation Procedures 6-9.........................
Preparation 6-9.....................................................
Access Procedure 6-12................................................
Procedures for External Modules 6-15....................................
Procedures for Internal Modules 6-26....................................
Repackaging 6-45..............................................
Repackaging Instructions 6-45..........................................
Troubleshooting 6-47...........................................
Troubleshooting Procedures 6-47........................................
DG2020A Diagnostics 6-47............................................
Options
Options and Accessories 7-1....................................
Options A1--A5 7-1..................................................
Option 01 Description 7-2............................................
Option 02 Description 7-2............................................
Option 1R Description 7-2............................................
Option 95 Description 7-2............................................
P3410 Option 95 Description 7-3.......................................
P3420 Option 95 Description 7-3.......................................
Accessories 7-4.....................................................
Electrical Parts List
Electrical Parts List 8-1........................................
Diagrams
Diagrams 9-1.................................................
Mechanical Parts List
Replaceable Mechanical Parts 10-1...............................
Parts Ordering Information 10-1.........................................
Using the Replaceable Parts List 10-2....................................

Table of Contents
DG2020A Service Manual iii
List of Figures
Figure 1-1: Trigger delay 1-7....................................
Figure 2-1: Rear panel controls 2-4..............................
Figure 2-2: Pod connection 2-7..................................
Figure 2-3: Yellow index mark and yellow wire for cable connection 2-8
Figure 2-4: CRT display 2-11....................................
Figure 2-5: Load data & setup menu 2-14..........................
Figure 2-6: Operating buttons and menu layout 2-15................
Figure 2-7: Pod channel data bit allocation 2-19....................
Figure 2-8: Output voltage level and delay time display
for the P3420 pod 2-21......................................
Figure 4-1: Operating buttons and menu layout 4-4................
Figure 4-2: Diagnostics menu 4-5................................
Figure 4-3: Frequency measurement connections 4-6...............
Figure 4-4: External clock input connection 4-8....................
Figure 4-5: Pod connection 4-10..................................
Figure 4-6: P3410 data output connectors 4-11......................
Figure 4-7: P3420 data output connectors 4-11......................
Figure 4-8: External trigger operation connections 4-13..............
Figure 4-9: P3410 event input connections 4-15.....................
Figure 4-10: P3420 event input connections 4-15....................
Figure 4-11: DG2020A event output connections 4-16................
Figure 4-12: Pod connection 4-17.................................
Figure 4-13: P3410 voltage level display 4-18.......................
Figure 4-14: P3410 output pins 4-18..............................
Figure 4-15: Pin header cable types 4-18...........................
Figure 4-16: Output voltage test connections 4-19...................
Figure 4-17: Variable delay test connections 4-20....................
Figure 4-18: Event input operation confirmation connections 4-22.....
Figure 4-19: Inhibit operation confirmation connections 4-23.........
Figure 4-20: Pod connection 4-24.................................
Figure 4-21: P3420 voltage level display 4-25.......................
Figure 4-22: P3420 output connectors 4-25.........................
Figure 4-23: Output voltage level measurement connections 4-26......
Figure 4-24: Variable delay precision check 4-29....................
Figure 4-25: Event input operation confirmation connections 4-31.....

Table of Contents
iv DG2020A Service Manual
Figure 4-26: Inhibit input operation confirmation connections 4-32....
Figure 6-1: DG2020A orientation 6-11.............................
Figure 6-2: Guide to removal procedures 6-12......................
Figure 6-3: External modules 6-13...............................
Figure 6-4: Internal modules 6-14................................
Figure 6-5: Front-panel knob removal 6-16........................
Figure 6-6: Line fuse and line cord removal 6-17....................
Figure 6-7: Rear cover and cabinet removal 6-19....................
Figure 6-8: Front cover, trim ring, and menu button removal
(front cover not shown) 6-21..................................
Figure 6-9: Front-panel module removal 6-23......................
Figure 6-10: A12 keyboard removal 6-24...........................
Figure 6-11: Disassembly of front-panel module 6-25................
Figure 6-12: Connector module removal 6-28.......................
Figure 6-13: Fan and fan frame removal 6-29.......................
Figure 6-14: Rear shield cover removal 6-30........................
Figure 6-15: Power supply module removal 6-31....................
Figure 6-16: AUX power board and AC inlet removal 6-33...........
Figure 6-17: Monitor module removal 6-35.........................
Figure 6-18: CRT frame removal 6-36.............................
Figure 6-19: Circuit boards removal 6-39..........................
Figure 6-20: A17 backplane board removal 6-41....................
Figure 6-21: Battery location on the A17 backplane board 6-43.......
Figure 6-22: Floppy-disk drive module removal 6-44................
Figure 6-23: A6 CPU board 6-48.................................
Figure 6-24: Primary troubleshooting procedure--(1) 6-49............
Figure 6-25: Primary troubleshooting procedure--(2) 6-50............
Figure 6-26: POD connector troubleshooting procedure 6-51..........
Figure 6-27: Troubleshooting procedure 1 — power supply module 6-52
Figure 6-28: AUX power board 6-53..............................
Figure 6-29: Power supply module 6-53...........................
Figure 6-30: Troubleshooting procedure 2 —
A6 CPU board or front-panel module 6-54.....................
Figure 6-31: Key board 6-55.....................................
Figure 6-32: Troubleshooting procedure 3 — monitor module 6-56....
Figure 6-33: Monitor module 6-57................................
Figure 6-34: Horizontal and vertical sync signals 6-57...............
Figure 6-35: A video signal with white and black levels 6-58..........
Figure 6-36: Troubleshooting procedure 4 — module Isolation 6-59...

Table of Contents
DG2020A Service Manual v
Figure 9-1: Block diagram of DG2020A with options 01 and 02 9--3...
Figure 9-2: Interconnect diagram of DG2020A
with options 01 and 02 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............................
Figure 10-6: Option 01 10-14.....................................
Figure 10-7: Option 02 10-15.....................................

Table of Contents
vi DG2020A Service Manual
List of Tables
Table 1-1: Warranted electrical characteristics 1-4.................
Table 1-2: Warranted environmental characteristics 1-8............
Table 1-3: Electrical characteristics (typical) 1-9...................
Table 1-4: Nominal traits -- electrical characteristics 1-11............
Table 1-5: Nominal traits -- mechanical characteristics 1-15..........
Table 1-6: Certifications and compliances 1-16.....................
Table 2-1: Power-cord conductor identification 2-2................
Table 2-2: Power cord identification 2-2..........................
Table 2-3: Fuse type and rating 2-4..............................
Table 2-4: DG2030 display elements 2-12..........................
Table 4-1: Performance check disk’s file list 4-2...................
Table 4-2: Required equipment 4-3..............................
Table 4-3: Error Codes 4-5.....................................
Table 4-4: Internal clock frequency precision (PLL off) 4-8..........
Table 4-5: Delay precision 4-21..................................
Table 4-6: High level output voltage ranges for a 1 MW load 4-27.....
Table 4-7: Low level output voltage ranges for a 1 MW load 4-28.....
Table 4-8: Delay precision 4-30..................................
Table 6-1: Relative susceptibility to static-discharge damage 6-3.....
Table 6-2: External inspection check list 6-5......................
Table 6-3: Internal inspection check list 6-6.......................
Table 6-4: Equipment required 6-10..............................
Table 7-1: International power cords 7-1.........................
Table 7-2: Standard accessories 7-4.............................
Table 7-3: Standard accessories for pods 7-4......................
Table 7-4: Optional accessories 7-5..............................
Table 7-5: Maintenance kit contents 7-6..........................