Tektronix TBS2000B Series Bedienungsanleitung

TBS2000B Series

Digital Storage Oscilloscopes

Service Manual

*P077153900*

077-1539-00

TBS2000B Series

Digital Storage Oscilloscopes

Service Manual

www.tek.com

077-1539-00

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.

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.

Table of Contents

Important safety information .............................................................................................................. iii

General safety summary ................................................................................................................ iii

Service safety summary ................................................................................................................. vi

Terms in the manual ..................................................................................................................... vii

Symbols on the product ................................................................................................................ vii

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

Manual conventions ....................................................................................................................... ix

Modules .................................................................................................................................... ix

Replaceable parts ...................................................................................................................... ix

Safety ........................................................................................................................................ ix

Ordering information

Ordering information ...................................................................................................................... 1

Theory of operation

Power supply .................................................................................................................................. 4

Front End assembly (4 channel models) ......................................................................................... 5

Main board ...................................................................................................................................... 5

I/O board (4 channel models) ......................................................................................................... 6

Front-panel board ........................................................................................................................... 6

Adjustments

Adjustments .................................................................................................................................... 7

Maintenance

Preventing ESD .............................................................................................................................. 9

Inspection and cleaning ................................................................................................................ 10

General care ............................................................................................................................. 10

Flat panel display cleaning ...................................................................................................... 10

Exterior cleaning ..................................................................................................................... 11

Interior cleaning ...................................................................................................................... 12

Lubrication .............................................................................................................................. 13

Module removal ............................................................................................................................ 13

Required tools and equipment ................................................................................................. 14

To remove modules ................................................................................................................. 14

TBS2000B Series Service Manual i

Troubleshooting ............................................................................................................................ 14

Adjustment after repair ............................................................................................................ 15

Required tools and equipment ................................................................................................. 15

Troubleshooting procedure ........................................................................................................... 15

Primary troubleshooting flowchart .......................................................................................... 16

AC Power Supply module troubleshooting flowchart ............................................................ 17

Board isolation troubleshooting flowchart .............................................................................. 18

Unpacking and repacking instructions ......................................................................................... 19

Unpacking ............................................................................................................................... 19

Repacking ................................................................................................................................ 19

Storage ..................................................................................................................................... 19

Replaceable parts

Parts ordering information ............................................................................................................ 21

Part number revision level ....................................................................................................... 21

Module servicing ..................................................................................................................... 22

Using the replaceable parts list ..................................................................................................... 22

Abbreviations .......................................................................................................................... 23

Exploded view ......................................................................................................................... 23

The replaceable parts list .............................................................................................................. 23

Table of Contents

ii TBS2000B Series Service Manual

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.

TBS2000B Series Service Manual iii

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. 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.

Observe all terminal ratings. To avoid fire or shock hazard, observe all rating and

markings on the product. Consult the product manual 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.

Do not operate without covers. Do not operate this product with covers or panels

removed, or with the case open. Hazardous voltage exposure is possible.

Avoid exposed circuitry. Do not touch exposed connections and components when

power is present.

Do not operate with suspected failures. 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.

Important safety information

iv TBS2000B Series Service Manual

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. Be aware that condensation may occur if a

unit is moved from a cold to a warm environment.

Do not operate in an explosive atmosphere.

Keep product surfaces clean and dry. Remove the input signals before you clean

the product.

Provide proper ventilation. Refer to the installation instructions in the manual for

details on installing the product so it has proper 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.

Provide a safe working environment. 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.

Connect and disconnect properly. De-energize the circuit under test before

connecting or disconnecting the current probe.

Important safety information

TBS2000B Series Service Manual v

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.

Inspect the probe and accessories. 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. 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.

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

strength after performing a repair.

Important safety information

vi TBS2000B Series Service Manual

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