Tektronix TBS2072B, TBS2102B, TBS2202B, TBS2074B, TBS2104B Service Manual

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TBS2000B Series Digital Storage Oscilloscopes

Service Manual

077-1539-02

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.tek.com to find contacts in your area.

Table of Contents

List of Figures................................................................................................................................................................................5

List of Tables................................................................................................................................................................................. 6

Important safety information..........................................................................................................................................................7

General safety summary........................................................................................................................................................7

Service safety summary.........................................................................................................................................................9

Terms in the manual...............................................................................................................................................................9

Symbols on the product......................................................................................................................................................... 9

Preface........................................................................................................................................................................................10

Manual conventions............................................................................................................................................................. 10

Modules........................................................................................................................................................................ 10

Replaceable parts.........................................................................................................................................................10

Safety............................................................................................................................................................................10

Ordering information....................................................................................................................................................................11

Theory of operation..................................................................................................................................................................... 12

Power supply....................................................................................................................................................................... 13

Front End assembly (4 channel models)............................................................................................................................. 13

Main board........................................................................................................................................................................... 13

I/O board (4 channel models).............................................................................................................................................. 14

Front-panel board................................................................................................................................................................ 14

Adjustments................................................................................................................................................................................ 15

Adjustments......................................................................................................................................................................... 15

Maintenance................................................................................................................................................................................16

Preventing ESD................................................................................................................................................................... 16

Inspection and cleaning....................................................................................................................................................... 16

General care................................................................................................................................................................. 16

Flat panel display cleaning........................................................................................................................................... 16

Exterior cleaning........................................................................................................................................................... 17

Interior cleaning............................................................................................................................................................ 17

Lubrication.................................................................................................................................................................... 18

Module removal................................................................................................................................................................... 18

Required tools and equipment......................................................................................................................................18

To remove modules...................................................................................................................................................... 19

Troubleshooting................................................................................................................................................................... 19

Adjustment after repair..................................................................................................................................................19

Required tools and equipment......................................................................................................................................19

Troubleshooting procedure.................................................................................................................................................. 19

Primary troubleshooting flowchart.................................................................................................................................20

AC Power Supply module troubleshooting flowchart....................................................................................................21

Board isolation troubleshooting flowchart..................................................................................................................... 22

Unpacking and repacking instructions................................................................................................................................. 22

Unpacking.....................................................................................................................................................................22

Repacking.....................................................................................................................................................................23

Storage......................................................................................................................................................................... 23

Replaceable parts....................................................................................................................................................................... 24

TBS2000B Series Digital Storage Oscilloscopes Service Manual 3

Table of Contents

Parts ordering information....................................................................................................................................................24

Part number revision level............................................................................................................................................ 24

Module servicing...........................................................................................................................................................24

Using the replaceable parts list............................................................................................................................................24

Abbreviations................................................................................................................................................................ 25

Exploded view...............................................................................................................................................................25

The replaceable parts list.....................................................................................................................................................25

TBS2000B Series Digital Storage Oscilloscopes Service Manual 4

List of Figures

Figure 1: TBS2000B block diagram (2 channel)......................................................................................................................... 12

Figure 2: TBS2000B block diagram (4 channel)......................................................................................................................... 13

Figure 3: Primary troubleshooting procedure flowchart.............................................................................................................. 20

Figure 4: AC Power Supply module troubleshooting.................................................................................................................. 21

Figure 5: Board isolation troubleshooting flowchart.................................................................................................................... 22

Figure 6: Four channel models; front half................................................................................................................................... 25

Figure 7: Four channel models; rear half.................................................................................................................................... 28

Figure 8: Two channel models; front half.................................................................................................................................... 30

Figure 9: Two channel models; rear half.....................................................................................................................................32

TBS2000B Series Digital Storage Oscilloscopes Service Manual 5

List of Tables

Table 1: External inspection checklist......................................................................................................................................... 17

Table 2: Internal inspection checklist...........................................................................................................................................18

Table 3: Parts list column descriptions........................................................................................................................................ 25

Table 4: Four-channel model parts: front panel, display, and front chassis.................................................................................26

Table 5: Four-channel model parts: inputs, main board, power supply, I/O, rear chassis, rear cover.........................................28

Table 6: Two-channel model parts: front panel, display, and front chassis................................................................................. 30

Table 7: Two-channel model parts: power supply, main board, AC connector/filter, rear cover.................................................. 32

TBS2000B Series Digital Storage Oscilloscopes Service Manual 6

Important safety information

This manual contains information and warnings that must be followed by the user for safe operation and to keep the product in a safe condition.

To safely perform service on this product, see the Service safety summary that follows the General safety summary.

General safety summary

Use the product only as specified. Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. Carefully read all instructions. Retain these instructions for future reference.

This product shall be used in accordance with local and national codes.

For correct and safe operation of the product, it is essential that you follow generally accepted safety procedures in addition to the safety precautions specified in this manual.

The product is designed to be used by trained personnel only.

Only qualified personnel who are aware of the hazards involved should remove the cover for repair, maintenance, or adjustment.

Before use, always check the product with a known source to be sure it is operating correctly.

This product is not intended for detection of hazardous voltages.

Use personal protective equipment to prevent shock and arc blast injury where hazardous live conductors are exposed.

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. Do not disable the power cord grounding connection.

Power disconnect The power switch disconnects the product from the power source. See instructions for the location. Do not

position the equipment so that it is difficult to disconnect the power switch; it must remain accessible to the user at all times to allow for quick disconnection if needed.

Power disconnect The power cord disconnects the product from the power source. See instructions for the location. Do not

position the equipment so that it is difficult to operate the power cord; it must remain accessible to the user at all times to allow for quick disconnection if needed.

Connect and disconnect properly

Observe all terminal ratings To avoid fire or shock hazard, observe all rating and markings on the product. Consult the product manual

Do not operate without covers Do not operate this product with covers or panels removed, or with the case open. Hazardous voltage

Do not connect or disconnect probes or test leads while they are connected to a voltage source.

Use only insulated voltage probes, test leads, and adapters supplied with the product, or indicated by Tektronix to be suitable for the product.

for further ratings information before making connections to the product. Do not exceed the Measurement Category (CAT) rating and voltage or current rating of the lowest rated individual component of a product, probe, or accessory. Use caution when using 1:1 test leads because the probe tip voltage is directly transmitted to the product.

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

Do not float the common terminal above the rated voltage for that terminal.

exposure is possible.

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Important safety information

Avoid exposed circuitry Do not touch exposed connections and components when power is present.

Do not operate with suspected failures

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.

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 installation instructions in the manual for details on installing the product so it has proper

Provide a safe working environment

If you suspect that there is damage to this product, have it inspected by qualified service personnel.

Disable the product if it is damaged. Do not use the product if it is damaged or operates incorrectly. If in doubt about safety of the product, turn it off and disconnect the power cord. Clearly mark the product to prevent its further operation.

Before use, inspect voltage probes, test leads, and accessories for mechanical damage and replace when damaged. Do not use probes or test leads if they are damaged, if there is exposed metal, or if a wear indicator shows.

Examine the exterior of the product before you use it. Look for cracks or missing pieces.

Use only specified replacement parts.

Be aware that condensation may occur if a unit is moved from a cold to a warm environment.

Remove the input signals before you clean the product.

ventilation.

Slots and openings are provided for ventilation and should never be covered or otherwise obstructed. Do not push objects into any of the openings.

Always place the product in a location convenient for viewing the display and indicators.

Probes and test leads

Before connecting probes or test leads, connect the power cord from the power connector to a properly grounded power outlet.

Keep fingers behind the protective barrier, protective finger guard, or tactile indicator on the probes.

Remove all probes, test leads and accessories that are not in use.

Use only correct Measurement Category (CAT), voltage, temperature, altitude, and amperage rated probes, test leads, and adapters for any measurement.

Beware of high voltages Understand the voltage ratings for the probe you are using and do not exceed those ratings. Two ratings are

important to know and understand:

• The maximum measurement voltage from the probe tip to the probe reference lead

• The maximum floating voltage from the probe reference lead to earth ground

These two voltage ratings depend on the probe and your application. Refer to the Specifications section of the manual for more information.

Warning: To prevent electrical shock, do not exceed the maximum measurement or maximum floating voltage for the oscilloscope input BNC connector, probe tip, or probe reference lead.

Connect and disconnect properly

Connect the probe output to the measurement product before connecting the probe to the circuit under test. Connect the probe reference lead to the circuit under test before connecting the probe input. Disconnect the probe input and the probe reference lead from the circuit under test before disconnecting the probe from the measurement product.

TBS2000B Series Digital Storage Oscilloscopes Service Manual 8

Important safety information

Connect and disconnect properly

Inspect the probe and accessories

De-energize the circuit under test before connecting or disconnecting the current probe.

Connect the probe reference lead to earth ground only.

Do not connect a current probe to any wire that carries voltages or frequencies above the current probe voltage rating.

Before each use, inspect probe and accessories for damage (cuts, tears, or defects in the probe body, accessories, or cable jacket). Do not use if damaged.

Service safety summary

The Service safety summary section contains additional information required to safely perform service on the product. Only qualified personnel should perform service procedures. Read this Service safety summary and the General safety summary before performing any service procedures.

To avoid electric shock Do not touch exposed connections.

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 product power and disconnect the power cord from the mains power

before removing any covers or panels, or opening the case for servicing.

Use care when servicing with power on

Verify safety after repair Always recheck ground continuity and mains dielectric strength after performing a repair.

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.

Terms in the manual

These terms may appear in this manual:

Warning:

CAUTION: Caution statements identify conditions or practices that could result in damage to this product or other property.

Warning statements identify conditions or practices that could result in injury or loss of life.

Symbols 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.

When this symbol is marked on the product, be sure to consult the manual to find out the nature of the potential hazards and any actions which have to be taken to avoid them. (This symbol may also be used to refer the user to ratings in the manual.)

The following symbols may appear on the product:

TBS2000B Series Digital Storage Oscilloscopes Service Manual 9

Preface

This service manual provides information that you need to troubleshoot, disassemble, and replace parts on the following Tektronix oscilloscopes:

Model Bandwidth Channels

TBS2072B

70 MHz 2

Preface

TBS2102B

TBS2202B

TBS2074B

TBS2104B

TBS2204B

100 MHz 2

200 MHz 2

70 MHz 4

100 MHz 4

200 MHz 4

Manual conventions

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

Modules

Throughout this manual, any replaceable component, assembly, or part is referred to by the term module.

Replaceable parts

This manual refers to any field-replaceable assembly or mechanical part specifically by its name or generically as a replaceable part. In general, a replaceable part is any circuit board or assembly, (such as the hard disk drive), or a mechanical part, (such as the I/O port connectors), that is listed in the replaceable parts list that can be replaced in the field. (See The replaceable parts list on page 25.)

Safety

Symbols and terms related to safety appear in the General Safety Summary.

Information for service procedures appears in both the General Safety Summary and the Service Safety Summary.

TBS2000B Series Digital Storage Oscilloscopes Service Manual 10

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