Tektronix TAS 475 Manuel utilisateur

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•

Service Manual

Tektronix

TAS

475 &

TAS

485

Analog Oscilloscopes

070-8878-00

Warning

The servicing instructions are for use

qualified personnel only.

avoid personal

injury, do not perform any servicing unless you

are qualified to do so. Refer to the Safety

Summary prior to performing service.

Please check for change information at the

rear

this manual,

First Printing: October 1993

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Instrument Serial Numbers

Each instrument manufactured by Tektronix has a serial number on a panel insert ortag, or stamped on the

chassis. The first letter in the serial number designates the country

manufacture. The last five digits of the

serial number are assigned sequentially and are unique to each instrument. Those manufactured

the

United States have six unique digits. The country

manufacture

identified as follows:

B010000

E200000

J300000

H700000

Tektronix, Inc., Beaverton, Oregon, USA

Tektronix United Kingdom, Ltd., London

Sony/Tektronix, Japan

Tektronix Holland,

NV,

Heerenveen, The Netherlands

Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit

alpha code to identity the country

manufacture (e.g.,

for Japan, HKfor Hong Kong, IL for Israel, etc.).

Tektronix, Inc.,

P.O.

Box 500, Beaverton,

97077

Printed in U.S.A.

U.S.

and foreign

patents, issued and pending. The following are registered trademarks: TEKTRONIX, TEK, TEKPROBE, and

SCOPE-MOBILE.

•

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•

WARRANTY

Tektronix warrants thatthis product will be free from defects in materials and workmanship for a period of three

(3)

years from

the date of shipment. Ifany such product proves defective during this warranty period, Tektronix, at its option, either will repair

the defective product without charge for parts and labor,

will provide a replacement in exchange for the defective product.

In orderto obtain service underthis warranty, Customer must notifyTektronix ofthe defectbefore the expiration ofthe warranty

period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and

shipping the defective product

the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall

pay for the return of the product

Customer if the shipment is to a location within the country in which the Tektronix service

center

located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for

products returned

any other locations.

This warranty shall

not

apply

any defect, failure

damagecaused by improper use or improperor inadequate maintenance

and care. Tektronix shall not be obligated

furnish service underthis warranty

to repair damage resulting from attempts

b)(

personnel other than Tektronix representatives

install, repair or service the product;

to repair damage resulting from

improper use or connection to incompatible equipment; or

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

TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER

WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES

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

LIABLE FOR ANY INDIRECT, SPECIAL,

INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS

ADVANCE NOTICE

THE POSSIBILITY OF SUCH DAMAGES.

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•

Specifications

Operation

Table of Contents

List

Figures.

. . . . .. . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. . . . . . .. . . . vii

List

Tables . . . . . .. . . . . . . .. . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . . . . xi

Preface

.....................................................

xiii

Related Manuals . . . . . . .. . . . . . . . . . .. . . . . . . . . .. . . . . . . . . . . . .

xiv

Safety

Summary.

. . . . . . . .. . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . . xv

Symbols and Terms

......................................

Specific Precautions

.....................................

xvi

Product

Description.........................................

1-1

User Interface

...........................................

1-2

AUTOSET . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 1-2

Menus

..............................................

General Purpose Knob and TOGGLE

..................

Save/Recall Setups

...................................

Vertical System

.........................................

1-2

1-3

Horizontal System

.......................................

1-3

Trigger System

..........................................

1-3

Measurement

Cursors.

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

Option 22: Additional Probes

...........................

1-4

Option 23: Additional Probes -

(TAS

475)

...............

1-4

Nominal

Traits.

. . . . .. . . . . . . . . . .. . . . . . . . .. . . . . . . . . . . . . . . . .. . . . 1-5

Warranted Characteristics

...................................

1-9

Performance Conditions . . . . . . . . . . . . . .. . . . . . . . . . . . . .. . . . . . 1-9

Typical Characteristics . . . . . . . . . . . . . . . .. . . . . . . . .. . . . . . . . . . . . . . 1-17

Power On

...................................................

2-1

Installation

..............................................

2-1

Quick Start . . . . . . . . .. . . . . . .. . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . . . . 2-3

Selecting and Deselecting

Input

Channels

.................

2-3

Using the

Menus.

. . . . . . . . . . . . . . . . .. . . . . . . . . .. . . . . . . . . . . . . 2-3

Connecting a Signal

....................................

Using AUTOSET

........................................

. 2-4

2-4

TAS 475 and TAS 485 Service Manual

Scan by Zenith

Table of Contents

Compensating the Probe

................................

Menu Map

..............................................

. 2-5

2-8 •

Theory of Operation

Circuit Description

.........................................

3-1

Logic Conventions

......................................

3-1

Module Interconnection

.................................

3-1

Analog Board .

..........................................

. 3-4

Attenuators A1

.......................................

. 3-4

Probe Coding Interface

............................

. 3-4

Analog Acquisition Hybrid

..........................

. 3-4

Processor System

......................................

. 3-4

Processor Subsystem A5

..............................

. 3-4

ROM/RAM Subsystem

.............................

. 3-5

Readout Subsystem A5

...............................

. 3-5

Front-Panel Interface Subsystem

....................

. 3-5

Analog Board Interface Subsystem A5

..................

. 3-5

Display Assembly .

......................................

. 3-5

Vertical Output A3

....................................

. 3-6

Horizontal Output A3

.................................

. 3-6

High Voltage A3

......................................

. 3-6

Front Panel

.............................................

Menu Switches A4

....................................

. 3-6 •

3-6

CPU A4

.............................................

. 3-7

FPP

Pots & Probes A4

................................

. 3-7

LEDs & Driver A4

.....................................

. 3-7

Switches A4

.........................................

. 3-8

Low Voltage Power Supply

..............................

. 3-8

Fan

....................................................

. 3-8

Performance Verification

General Instructions

........................................

4-1

Using the Brief Performance Checks Procedures .

.........

4-1

Using the Performance Tests Procedures

.................

4-1

Conventions

............................................

. 4-2

Brief Performance Checks

..................................

. 4-3

Power-On Self Tests

.....................................

. 4-3

Functional Tests

........................................

. 4-3

Functional Tests Prerequisites

..........................

. 4-4

Verify the Probe Compensator Output

..................

. 4-4

Verify the Input Channels

..............................

Verify the Alt/Chop and Add Functions

..................

. 4-5 •

4-6

;;

Contents

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•

Adjustment

Table of Contents

Verify the Time Base

..................................

Verify the Trigger System

..............................

Temperature Compensation Calibrations

.................

Horizontal Sweep Path

................................

Vertical Signal Path

...................................

4-7

4-8

4-9

4-12

Performance Tests.

...

......

....

.....

. . . . . .

....

...

4-13

Performance

Tests

Prerequisites................

4-13

Equipment Required

.....................................

4-13

Vertical System Checks

..................................

4-15

Check DC Gain and Voltage Measurement Accuracy

......

4-15

Check Trigger Level Accuracy

..........................

4-16

Check DC Coupling Bandwidth

.........................

4-17

Check X-Axis Gain . . . . . .. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . 4-19

Horizontal System

Checks................................

4-19

Check Time Base and Time Cursor Accuracy

.............

4-19

Check Dual Delay Accuracy

............................

4-23

Trigger System Checks . . .. . . . . . .. . . .. . . . . . . . . . . . . . . . . . . .. 4-25

Check Trigger Sensitivity

. . . . . .. . . . . . . . . . . . . . . . . . . . . . . 4-25

Adjustment Procedures

.....................................

Requirements for Performance

..........................

Personnel

...........................................

Access

Adjustments

................................

Warm-Up Period

.....................................

Equipment Required

....................................

Performing the Adjustment Procedures .

..................

Complete Adjustment

.................................

Partial Adjustment

....................................

Adjustment Dependencies

............................

5-1

5-2

5-3

Adjustment Instructions.

....

...

.........

.....

5-4

CRT Adjustments

.....................................

5-4

Low Frequency Output Compensation

...................

5-5

Factory Horizontal Cal

.................................

5-7

Factory Vertical Cal

. . . .. . . . . . . . . . . . . . . . . . .. . . . . . . . . . .

5-1

High Frequency Step Response. . . . . . . . . . . . . .. . . . . . . . . . . 5-12

Attenuator Compensation

..............................

5-14

Vertical Gain Adjust (Cabinet On) . . . . . . . . . . . . .. . . . . . . . . . . 5-16

TAS 475 and TAS 485 Service Manual

iii

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Table

Contents

Maintenance

Maintenance Information

....................................

Before Servicing

........................................

Tektronix Service

.......................................

6-1

Warranty Service

..............

. . . .. . . . . . .. . . . . . . . . . . . .

6-1

Repair or Calibration Service. . . . . . . . . . . . . .. . . . . . . .. . . . . . 6-2

Self Service

.............................................

6-2

Preventing ESD . . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . 6-2

Susceptibility to

ESD

..................................

6-3

Inspection and Cleaning

.....................................

6-5

General Care

............................................

6-5

Inspection and Cleaning Procedures

......................

6-5

Inspection -Exterior . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . 6-6

Cleaning Procedure -Exterior

.........................

6-6

Cleaning Procedure -

Interior.

. . . . . . . . .. . . . .. . . . . . . . . . . 6-7

Cleaning the

CRT

Implosion

Shield..

. . .

.....

....

6-7

Removal and Installation Procedures

.........................

6-9

Preparation -Please Read . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . 6-9

Cable Removal

.......................................

6-9

General Instructions

...................................

6-10

Summary of Procedures

...............................

6-10

Line Cord and Line Fuse

................................

Line Cord

...........................................

. 6-14

6-14

Line Fuse

............................................

6-15

Front-Panel Knobs and

Shafts............................

6-15

Removing Front-Panel Knobs and Shafts. . . . . .. . . . . . . . . . . 6-15

Installing Front-Panel Knobs and Shafts . . . . .. . . . . . . . .. . . . 6-16

Feet, Rear Cover, and Cabinet

............................

6-17

Rear Cover

...........................................

6-18

Cabinet

..............................................

6-18

Replacing the Front Feet

...............................

6-18

Front-Panel Trim, Menu and Power Buttons, EMI

Gasket....

6-18

Removing the Front Trim

...............................

6-18

Menu Buttons and Elastomer

...........................

6-19

Power Button Replacement . . . . . . . . .. . . . . . .. . . . . . . . . . . . . 6-19

Installing the Front

Trim

................................

6-19

Installing the

EMI

Gaskets

(TAS

485 Only)

....

. . . .. . . . . . . . 6-20

A62 Front Panel

module

Removal

.........................

6-21

Front-Panel Module Disassembly/Assembly.

. . . .

.. ..

6-22

Menu Flex

Circuit

Replacement

...........................

6-24

A1 Analog Board . . . .. . .. . . . . . . . . . . . .. . . . .. . . . .. . . . .. . . . . . 6-26

CRT

Implosion

Shield

....................................

6-27

CRT.....................................................

6-29

CRT

Removal

........................................

CRT

Installation

......................................

. 6-29

6-31

Contents

•

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•

Options

Table

Contents

CRT Light Guide

........................................

CRT Front Bracket

......................................

. 6-32

6-33

A2 Display Control Board . . . . . . . .. . . . . . .. . . . . . . .. . . . . . . . .. 6-33

A63 Power Supply

Module................................

6-34

Power Supply Removal

................................

6-34

Power Supply Installation

..............................

6-35

Fan

and Fan Mount

......................................

6-36

Fan

and

Fan

Mount Removal

...........................

6-36

Fan

and

Fan

Mount Installation

.........................

6-37

Troubleshooting

...

. . .. .. . . . . . . . . .. . . . . . . . . .. . . . . . .. .. . . . .. . . 6-39

Troubleshooting Procedure . . . . . .. .. . . . .. . . . . . . . . . . . . . .. . . 6-39

Equipment

..............................................

6-39

Symptom

Matrix.........................................

6-40

Repackaging Information

....................................

6-49

Options.

. .

...

.....

....

.........

...

.....

7-1

Options

A1-A5:

International Power Cords

..............

Warranty-Plus Service Options

.........................

Option 3R: Rackmount

................................

Option 02: Front Cover and Pouch

.....................

Option 9C: Certificate of Calibration and

Test

Data Report

7-1

7-2

Replaceable Electrical Parts List

Replaceable Electrical

Parts........

....

.. ..

........

.....

8-1

Diagrams

Diagrams and Circuit Board

Illustrations........

.......

9-1

Symbols

................................................

9-1

Component

Values.

. . . . . . .. . . . . . . . . . .. . . .. . . . . . . . . . . .. . . .

9-1

Graphic Items and Special Symbols Used in This

Manual...

9-1

Component Locator Diagrams

............................

9-2

Replaceable Mechanical Parts List

Replaceable Mechanical

Parts................................

10-1

TAS 475 and TAS 485 Service Manual v

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Table

Contents •

•

Contents

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