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

General Safety Summary
General SafetySummary
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 a larger system.
Read the safety sections of the other component manuals for warnings and
cautions related to operating the system.
To Avoid Fire or Personal
Injury
Use proper power cord. Use only the power cord specified for this product and
certified for the country of use.
Ground the product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
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 apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Power disconnect. The power cord disconnects the product from the power source.
Do not block the power cord; it must remain accessible to the user at all times.
Do not operate without covers. Do not operate this product with covers or panels
removed.
Do not operate with suspected failures. If you suspect that there is damage to this
product, have it inspected by qualified service personnel.
Avoid exposed circuitry. Do not touch exposed connections and components when
power is present.
Replace batteries properly. Replace batteries only with the specified type and
rating.
Use proper fuse. Use only the fuse type and rating specified for this product.
Wear eye protection. Wear eye protection if exposure to high-intensity rays or
laser radiation exists.
1741C Waveform Monitor Service Manual v

General Safety Summary
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.
TermsinThisManual 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.
Symbols and 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.
The following symbol(s) may appear on the product:
vi 1741C Waveform Monitor Service Manual

Service Safety Summary
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, switch off the instrument power, then
disconnect the power cord from the mains power.
UseCareWhenServicingWithPowerOn. Dangerousvoltagesorcurrentsmay
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.
1741C Waveform Monitor Service Manual vii

Service Safety Summary
viii 1741C Waveform Monitor Service Manual

Preface
This manual supports servicing to the module level of the 1741C Waveform
Monitor, which processes video signals for display on an internal XGA LCD.
The instrument finds use as a monitor for broadcasting, production, and
post-production environments.
This manual explains how to troubleshoot and service the monitor to the module
level. The manual is divided into the following sections:
Introduction provides a general product description and tells where to find
product installation information.
Theory of Operation provides descriptions of the 1741C Waveform Monitor
modules.
Adjustment Procedures details the adjustments that can be performed if the
instrument is out of specification.
Maintenance tells you how to troubleshoot the product to the module level
and how to handle the modules.
Replaceable Parts illustrates the replaceable modules and mechanical parts,
and provides replacement part numbers.
Manual Conventions
The following terms and conventions are used throughout this manual:
The term “monitor” is used interchangeably with the more formal term
“1741C Waveform Monitor.”
The term “instrument” is used interchangeably with the term “monitor.”
1741C Waveform Monitor Service Manual ix

Preface
Related Manuals
This manual assumes you have access to the following manuals when servicing
this product. These manuals ship with the product and are also downloadable
from the Tektronix Web site.
Table i: Related documentation
Item Purpose Location
1741C Waveform Monitor Quick Start
User Manual
Installation and high-level operational
overview
1741C Waveform Monitor Specifications
and Performance Verification
Procedure for checking performance and
list of specifications
1741C Master Information Base Programmers command reference for
controlling the waveform monitor
x 1741C Waveform Monitor Service Manual

Introduction

Introduction
The 1741C Waveform Monitor provides a powerful monitoring solution for
broadcast, production, and post-production environments.
Service Strategy
The 1741C Waveform Monitors will be repaired to the module level at selected
Tektronix service centers. Repair includes functional verification of the product.
Component level repair by the customer is not supported.
Specifications
The specifications for this product are in the Specifications and Performance
Verification manual, found on the 1741C Documents CD that ships with the
product. (See page x, Related Manuals.)
Performance Verification
The Performance Verification procedure for this product is in the Specifications
and Performance Verification manual, found on the 1741C Documents CD that
shipswiththeproduct. (Seepagex,Related Manuals.)
Options and Accessories
The lists of options and accessories for this product are found in the 1741C
Waveform Monitor Quick Start User Manual that ships with the product. (See
page x, Related Manuals.)
Configurations
At introduction there are no configuration options offered for the 1741C
Waveform Monitor.
1741C Waveform Monitor Service Manual 1–1

Introduction
Hardware Installation
The waveform monitor is shipped in a wrap-around chassis which covers the
instrument bottom and two sides. A cover is installed on the chassis, and the
rear panel is made up of the module rear panel. You can operate the waveform
monitor in the instrument chassis (the top cover must be installed, for safety and
forproperc
ooling), or installed in an approved portable cabinet or rack adapter.
You can also install the waveform monitor in a custom installation, such as a
console. For installation instructions, refer to the 1741C Waveform Monitor Quick
Start User Manual.
Product Upgrade
To install product enhancements when ordered as a field upgrade, refer to the
instructions included with the kit. Software is available at www.tek.com. The
1741C Waveform Monitor User Manual also includes instructions for updating
productsoftware.
Operating Information
For basic operating instructions, refer to the 1741C Waveform Monitor User
Manual that shipped with this product.
Power-On Procedure 1. This product has no power switch; to power it up, plug it in to a line voltage
source.
2. Wait for the system to complete its power-on self-tests.
Power-Down Procedure There are two methods to power down the waveform monitor
Power Down –Unplugtheinstrument.
Standby – The instrument can be placed in a low-power standby mode by
touching the Standby power button. This also saves the current instrument state
as the Latest Preset, which can be configured as the Power-up Preset.
1–2 1741C Waveform Monitor Service Manual