Tektronix 071-1844-00 User Manual

Service Manual

DPO4000 Series Digital Phosphor Oscilloscopes

071-1844-00

This document applies to firmware version 1.00 and above.

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. 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 supercede s that in all previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

TekLink is a trademark 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:

H In North America, call 1-800-833-9200.

H Worldwide, visit www.tektronix.com to find conta cts in your area.

Warranty 16

Tektronix warrants that the product will be free from defects in materials and workmanship for a period of three (3) years from the date of original purchase from an authorized Tektronix distributor. If the 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. Batteries are excluded from this warranty. 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, shipping charges prepaid, and with a copy of customer proof of purchase. Tektronix shall pay for the return of the product to Customer if the shipment is t o 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 obliga ted 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 P ARTICULAR 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.

General Safety Summary iii...................................

Service Safety Summary v....................................

Environmental Considerations vii...............................

Preface ix...................................................

Manual Conventions ix..............................................

Related Documentation ix...........................................

Operating Information 1--1.....................................

Theory of Operation 2--1.......................................

Block Diagrams 2--1.................................................

Power Supply 2--2...................................................

I/O Board 2--2......................................................

Main Board 2--2.....................................................

Front--Panel Board 2--3...............................................

Adjustment Procedures 3--1.....................................

Required Equipment 3--1..............................................

Overview of the Adjustment Process 3--2.................................

Factory Adjustment Procedure 3--3......................................

Maintenance 4--1..............................................

Preventing ESD 4--1.................................................

Inspection and Cleaning 4--1...........................................

General Care 4--2................................................

Interior Cleaning 4--2.............................................

Exterior Cleaning 4--2............................................

Overview of Removal Procedures 4--6...................................

Removal Procedures 4--8..............................................

Troubleshooting 4--12.................................................

Troubleshooting Procedure 4--13.........................................

Unpacking and Repacking Instructions 4--16...............................

Mechanical Parts List 5--1......................................

Parts Ordering Information 5--1.........................................

Using the Replaceable Parts List 5--2....................................

Index Index--1....................................................

DPO4000 Series Service Manual

Table of Contents

List of Tables

List of Figures

T able 4--1: External inspection check list 4--3......................

T able 4--2: Internal inspection check list 4--4......................

Figure 2--1: DPO4000 series block diagram 2--1....................

Figure 4--1: Locator for trim and cabinet removal 4--7...............

Figure 4--2: Locator for internal modules 4--8......................

Figure 4--3: Primary troubleshooting procedure 4--13................

Figure 4-- 4: AC power supply troubleshooting procedure 4-- 14.........

Figure 4--5: Module isolation troubleshooting procedure 4--15.........

Figure 5--1: Exploded view, case 5--4..............................

Figure 5--2: Exploded view: front panel and display,

4-channel instruments 5-- 6...................................

Figure 5--3: Exploded view: front panel 2-channel instruments 5--8....

Figure 5-- 4: Exploded view: power supply and I/O board 5-- 10........

Figure 5--5: Exploded view: mainboard, inverter board,

and side fans 5--12..........................................

DPO4000 Series 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.

ToAvoidFireor

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.

The inputs are not rated for connection to mains or Category II, III, or IV circuits.

Connect the probe reference lead to earth ground only.

Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.

Do Not Operate Without Covers. Do not operate this product with covers or panels removed.

DPO4000 Series Service Manual

Do Not Operate With Suspected Failures. If you suspect 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.

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.

iii

General Safety Summary

Terms in this Manual

Symbols and Terms

on the Product

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.

These terms may appear on the product:

H DANGER indicates an injury hazard immediately accessible as you read the

marking.

H WARNING indicates an injury hazard not immediately accessible as you

read the marking.

H CAUTION indicates a hazard to property including the product.

The following symbols may appear on the product:

CAUTION

Refer to Manual

Push button IN

Protective Ground

(Earth) Terminal

Chassis Ground

Mains Connected

ON (Power)

Push button OUT

DPO4000 Series 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, switch off the instrument power, then disconnect the power cord from the mains power.

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.

DPO4000 Series Service Manual

Service Safety Summary

DPO4000 Series Service Manual

Environmental Considerations

This section provides information about the environmental impact of the product.

Product End-of-Life

Handling

Observe the following guidelines when recycling an instrument or component:

Equipment Recycling. Production of this equipment required the extraction and use of natural resources. The equipment may contain substances that could be harmful to the environment or human health if improperly handled at the product’s end of life. In order to avoid release of such substances into the environment and to reduce the use of natural resources, we encourage you to recycle this product in an appropriate system that will ensure that most of the materials are reused or recycled appropriately.

The symbol shown to the left indicates that this product complies with the European Union’s requirements according to Directive 2002/96/EC on waste electrical and electronic equipment (WEEE). For information about recycling options, check the Support/Service section of the Tektronix Web site (www.tektronix.com).

Mercury Notification. This product uses an LCD backlight lamp that contains mercury. Disposal may be regulated due to environmental considerations. Please contact your local authorities or, within the United States, the Electronics Industries Alliance (www.eiae.org) for disposal or recycling information.

Restriction of Hazardous

Substances

DPO4000 Series Service Manual

This product has been classified as Monitoring and Control equipment, and is outside the scope of the 2002/95/EC RoHS Directive. This product is known to contain lead, cadmium, mercury, and hexavalent chromium.

vii

Environmental Considerations

viii

DPO4000 Series Service Manual

Preface

Manual Conventions

This Service manual provides information to troubleshoot, disassemble, and replace parts on the DPO4000 Series Digital Phosphor Oscilloscopes.

This manual uses certain conventions that you should become familiar with before attempting service.

Modules

Replaceable Parts

Safety

Operating Information

For information on installing and operating your DPO4000 Series Digital Phosphor Oscilloscope, please refer to the DPO4000 Series Digital Phosphor Oscilloscopes User Manual. This manual is available on the Web at www.tektronix.com.

DPO4000 Series Service Manual

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Operating Information

1- 2

DPO4000 Series Service Manual

Theory of Operation

This chapter describes the electrical operation of the oscilloscope to the module level. Figure 2--1 shows the oscilloscope module interconnections.

Block Diagrams

Aux Out

Display

back light

inverter

power

LCD

Display

AC Line

Flash Port

Power supply

Compact

USB

J510

J170

J100

I/O Board

J420, J421

J120

J130

Ethernet

connector

J440

3 Fans

Figure 2- 1: DPO4000 series block diagram

J610

J570 J571 J850

Ch 1

J680

J930

Main board

Attenuator circuit

Ch 2

Ch 3

J0480

Ch 4

EXT

Front panel

Bezel

buttons

4-channel oscilloscopesEXT

2-channel oscilloscopes

Input ports for application modules

DPO4000 Series Service Manual

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