Tektronix TBS2000 Series Manuale utente

TBS2000 Series

Digital Storage Oscilloscopes

ZZZ

Service Manual

*P077115000*

077-1150-00

TBS2000 Series

Digital Storage Oscilloscopes

ZZZ

Service Manual

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

before performing service.

www.tek.com

077-1150-00

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

Important safety information..................................................................................... iv

General safety summary ..................................................................................... iv

Service safety summary..................................................................................... vii

Terms in this manual ........................................................................................ vii

Symbols and terms on the product......................................................................... viii

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

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

Operating information

Operating information............................................................................................ 1-1

Theory of operation

Theory of operation .............................................................................................. 2-1

Power supply................................................................................................. 2-2

Front End assembly (4 channel models) .................................................................. 2-2

Main board ................................................................................................... 2-2

I/O board (4 channel models)............................................................................... 2-3

Front-panel board............................................................................................ 2-3

Adjustments

Adjustments....................................................................................................... 3-1

Maintenance

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

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

Inspection and cleaning ..................................................................................... 4-1

Module removal.............................................................................................. 4-5

Troubleshooting.............................................................................................. 4-5

Troubleshooting procedure ................................................................................. 4-6

Unpacking and repacking instructions .................................................................. 4-10

Replaceable parts list

Replaceable parts list............................................................................................. 5-1

Parts ordering information.................................................................................. 5-1

Using the replaceable parts list............................................................................. 5-2

The replaceable parts list.................................................................................... 5-3

TBS2000 Series Service Manual i

Table of Contents

List of Figures

Figure 2-1: TBS2000 block diagram (2 channel)............................................................. 2-1

Figure 2-2: TBS2000 block diagram (4 channel)............................................................. 2-1

Figure 4-1: Primary troubleshooting procedure ﬂowchart................................................... 4-7

Figure 4-2: AC Power Supply module troubleshooting...................................................... 4-8

Figure 4-3: Board isolation troubleshooting ﬂowchart....................................................... 4-9

Figure 5-1: Four channel models; front half................................................................... 5-3

Figure 5-2: Four channel models; rear half.................................................................... 5-5

Figure 5-3: Two channel models; front half................................................................... 5-7

Figure 5-4: Two channel models; rear half .................................................................... 5-9

ii TBS2000 Series Service Manual

Table of Contents

List of Tables

Table 4-1: External inspection checklist....................................................................... 4-3

Table 4-2: Internal inspection checklist........................................................................ 4-4

Table 4-3: Most likely board to replace for failed diagnostics .............................................. 4-9

Table 5-1: Four-channel model parts: front panel, display, and front chassis ............................. 5-4

Table 5-2: Four-channel model parts: inputs, main board, power supply, I/O, rear chassis, rear cover 5-6

Table 5-3: Two channel model parts; front panel, labels, front panel, LCD, chassis ..................... 5-8

Table 5-4: Two channel model parts; power supply, main board, AC connector/ﬁlter, rear cover .... 5-10

TBS2000 Series Service Manual iii

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, additional information is provided at

the end of this section. (See page vii, Service 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.

Comply with local and national safety 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, make sure that the product is properly grounded.

Do not disable the power cord grounding connection.

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.

iv TBS2000 Series Service Manual

Important safety information

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 ratings

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.

Use proper fuse. Use only the fuse type and rating speciﬁed for this product.

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.

TBS2000 Series Service Manual v

Important safety information

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 ﬁnger guards 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 a current probe.

Connect the probe reference lead to earth ground only.

Do not connect a current probe to any wire that carries voltages above the current

probe voltage rating.

vi TBS2000 Series Service Manual

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