Tektronix 1741C User manual

xx
1741C
Waveform Monitor
ZZZ
Service Manual
*P077015502*
077-0155-02

1741C
Waveform Monitor
ZZZ
Service Manual
xx
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.
Revision A
www.tektronix.com
077-0155-02

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries
or suppliers, and are protected by national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication
supersedes that in all previously published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find contacts in your area.

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. Parts, modules and replacement products used by Tektronix for warranty
work may be new or reconditioned to like new performance. All replaced parts, modules and products become
the property of Tektronix.
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 WITH RESPECT TO THE PRODUCT 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.
[W2 – 15AUG04]

Table of Contents
General Safety Summary .......................................................................................... v
Service Safety Summary......................................................................................... vii
Preface.............................................................................................................. ix
Manual Conventions.......................................................................................... ix
Related Manuals ............................................................................................... x
Introduction
Introduction ....................................................................................................... 1-1
Service Strategy.............................................................................................. 1-1
Specifications................................................................................................. 1-1
Performance Verification.................................................................................... 1-1
Options and Accessories.................................................................................... 1-1
Configurations................................................................................................ 1-1
Hardware Installation........................................................................................ 1-2
Product Upgrade............................................................................................. 1-2
Operating Information....................................................................................... 1-2
Theory of Operation
Theory of Operation.............................................................................................. 2-1
Main Board................................................................................................... 2-3
Front Panel ................................................................................................... 2-4
Composite Input ............................................................................................. 2-4
Fan Control................................................................................................... 2-4
Power Supply and Distribution............................................................................. 2-4
Adjustment Procedures
Adjustments....................................................................................................... 3-1
Required Equipment......................................................................................... 3-1
Procedures.................................................................................................... 3-2
Maintenance
General Maintenance............................................................................................. 4-1
Preventing ESD.............................................................................................. 4-1
Inspection and Cleaning..................................................................................... 4-2
Troubleshooting.............................................................................................. 4-5
Detailed Troubleshooting Procedures ..................................................................... 4-9
1741C Waveform Monitor Service Manual i

Table of Contents
Removal and Replacement Procedures ...................................................................... 4-16
Preparation.................................................................................................. 4-16
Module Removal........................................................................................... 4-17
Repackaging Instructions...................................................................................... 4-24
Packaging................................................................................................... 4-24
Shipping to the Service Center........................................................................... 4-24
Replaceable Parts
Replaceable Parts................................................................................................. 5-1
Parts Ordering Information ................................................................................. 5-1
Using the Replaceable Parts Lists.......................................................................... 5-2
ii 1741C Waveform Monitor Service Manual

List of Figures
Figure 2-1: Main block diagram................................................................................ 2-2
Figure 4-1: Main board power supply test points and LEDs .............................................. 4-15
Figure 4-2: Front panel cable connections................................................................... 4-20
Figure 4-3: Front panel disassembly ......................................................................... 4-21
Figure 4-4: LCD assembly bracket and backlight lock .................................................... 4-22
Figure 4-5: Backlight removal................................................................................ 4-23
Figure 5-1: Circuit boards and connectors..................................................................... 5-4
Figure 5-2: Chassis components................................................................................ 5-7
Figure 5-3: Main board replaceable components ............................................................. 5-9
1741C Waveform Monitor Service Manual iii

Table of Contents
List of Tables
Table i: Related documentation................................................................................... x
Table 3-1: Required equipment for adjustment ............................................................... 3-1
Table 4-1: External inspection check list ...................................................................... 4-3
Table 4-2: Internal inspection check list ....................................................................... 4-3
Table 4-3: Required test equipment ............................................................................ 4-6
Table 4-4: Symptoms and causes............................................................................... 4-6
Table 4-5: Main board secondary supplies .................................................................. 4-12
Table 4-6: Advanced diagnostic measurements............................................................. 4-14
Table 4-7: Tools required for module removal.............................................................. 4-16
Table 4-8: Module removal ................................................................................... 4-17
Table 5-1: Replaceable parts list (See Figure 5-1.) ........................................................... 5-2
Table 5-2: Chassis components (See Figure 5-2.) ............................................................ 5-5
Table 5-3: Replaceable parts list (See Figure 5-3.) ........................................................... 5-8
Table 5-4: Replaceable parts list.............................................................................. 5-10
iv 1741C Waveform Monitor Service Manual