Digital Equipment VT50 Manuel utilisateur

VT50/VT52

Pocket

Service

Guide

K-VT502-PG-001

VT50/VT52

Pocket Service Guide

digital

equipment

corporation

•

maynard.

massachusetts

1st Edition, January

1979

by Digital Equipment Corporation

The material in this manual

for informational

purposes and

subject to change without notice.

Digital Equipment Corporation assumes no re-

sponsibility for any errors which may appear

this manual.

Printed in U.S.A.

The following are trademarks

Digital Equipment

Corporation, Maynard, Massachusetts:

DEC DECtape

DECCOMM DECUS

DECsystem-lO DIGITAL

DECSYSTEM-20 MASSBUS

UNIBUS

PDP

RSTS

TYPESET-8

TYPESETcll

CONTENTS

INTRODt:CTION

1.1

Purpose

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

1.2 Reference Documentation

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

2 TROUBLESHOOTING

2.1

Troubleshooting Philosophy. . . . . . . . . . . . . . . . . . . . 2

3 REMOVAL AND

REPLACEMENT

3.1 Removing and Replacing the

EIA

or 20

rnA

Adapter

Card.

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

. .

3.2 Removing and Replacing the Power Supply/

Monitor Assembly

Heat

Sink Panel. . . . . . . . . . . . . 16

3.3 Removing and Replacing the Base

Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.4 Removing and Replacing the Character

Generator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 18

3.5 Removing and Replacing the Printer

Interface Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.6 Removing and Replacing the

RUT

and

Modules

....

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

3.7 Removing and Replacing the Anti-Static

Ground

Shield...

. .

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

3.8 Removing and Replacing the Keyboard. . . . . . . .

3.9 Removing and Replacing the Power

Supply/Monitor Assembly. . . . . . . . . . . . . . . . . . .

3.10 Removing and Replacing the CRT

Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.11 Removing and Replacing the CRT Yoke. .

. . .

3.12 Removing and Replacing the Electrolytic

Copier Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.13 Removing and Replacing the Transformer

Assembly. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .. . . . 29

iii

iv CONTENTS

4 ALIGNMENT AND

ADJUSTMENTS

4.1

CRT

Yoke Alignment

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

4.2 Display Adjustments

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

5 ACCEPTANCE

TEST

PROCEDURES

5.1

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.2 Terminal

Tests.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.3 Copier Option Tests. . . . . . . . . . . . . . . . . . . . . . . . .

5.4 Printer Interface Option

Tests.

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

6 INSTALLATION

A:"oID

OPERATION

6.1

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

6.2

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

7 PMK04 OPERATION

APPENDIX A CARE AND HANDLING

CATHODE

RAY

TUBES

APPENDIX B REPLACEABLE

:\10DULES

AND ASSEMBLIES PARTS LIST

FIGURES

2-1

Troubleshooting Procedures Index

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

2-2

ROM

Chip Locations

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

2-3 Jumper

Location

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

3-1

Removal and Replacement Guide

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

3-2 Removing and Replacing the

EIA

20 rnA Adapter

Card

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

3-3 Removing and Replacing the Power

Supply/Monitor Assembly

Heat

Sink Panel

......

3-4 Removing and Replacing the Base

Assembly

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

3-5

Removing and Replacing the Character

Generator and Optional Printer Interface

Module

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

3-6 Removing and Replacing the

RUT

and

Modules

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

3-7 Removing and Replacing the Keyboard

.........

CONTENTS v

3-8 Removing and Replacing the Power

Supply/Monitor Assembly

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

Discharging the

CRT

and Power Supply

Capacitors

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

3-10 Power Supply/Monitor Assembly

Capacitor Connections

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

3-11

Installing the Power Supply/Monitor

Board Assembly

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

3-12 Removing and Replacing the CRT Assembly

.....

3-13 Removing and Replacing the Electrolytic

Copier Option

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

3-14 Copier Power and Signal Connectors

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

3-15 Transformer Assembly Wiring Diagram

.........

4-1

Yoke Alignment

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

4-2 Display Adjustments

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

6-1

Function and Baud Rate Switch Settings

.........

6-2 Power

ON/OFF

Switch and Intensity Control

Locations

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

B-1

VT52 Replaceable Modules and

Assemblies/Parts List

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

C-l

Physical/Functional Block Diagram

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

TABLES

2-1

Power on Troubleshooting Procedure. . . . . . . . . . . . 4

2-2 Character Display Troubleshooting

Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2-3 Display Troubleshooting Procedure . . . . . . . . .. . . . 9

~-4

Copier Option Troubleshooting Procedure

.. . . .

l-5 Printer Interface Option Troubleshooting

Procedure. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2-6 Printer Interface Option Baud Rate Selection. . . . .

7-2 7-Bit ASCII

Code.

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

1INTRODUCTION

1.1

PURPOSE

The purpose

this Pocket Service Guide

to pro-

vide Field Service engineers and technicians with a con-

venient

source

"memory

jogger"

reference

information for the VT50 and VT52 terminals. This in-

formation supplements detailed operation

and

mainte-

nance

information

contained

the

reference

documentation listed in Paragraph

1.2.

1.2 REFERENCE DOCUMENTATION

Document

VT52 DECscope Maintenance

Manual

DECscope User's Manual

PMK04 Operating and Service

Manual

Document No.

EK-VT52-MM-OOI

EK-

VT5X-OP-OOI

EK-PMK04-05-001

2TROUBLESHOOTING

2.1

TROUBLESHOOTING

PHILOSOPHY

NOTE

Before attempting to troubleshoot the terminal ensure that

there actually

a malfunction by checking that the unit is

properly set

for operation with a host computer (Chap-

ter 6).

Figure

2-1

an index to the troubleshooting pro-

cedures contained in Tables

2-1

through 2-5. Step-by-

step turn-on

and

operating instructions are followed by

normal display indications.

these indications are ab-

sent

incorrect, refer

the corresponding tables for

troubleshooting information.

Possible equipment malfunctions are categorized by

abnormal symptoms. Corresponding causes are listed in

order

probability. Corrective actions are limited

mainly

the adjustments

and/or

substitutions

major

replaceable subassemblies suspected to be defective.

If after performing the off-line tests described

this

chapter the terminal functions properly

but

still does

not

operate correctly when connected to a host computer,

verify

that

portion

the terminal

not

checked by off-

line tests and the interface cabling with the PMK04

tester (Chapter

6).

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