Digital Equipment VT420 User manual

VT420 Service Guide

Order Number EK-VT420-PS-002

···-----·'"···········

Digital Equipment Corporation

First

Edition,

December

1989

Second

Edition,

January

1992

The information

this

document

subject to

change

without notice

and

should not

construed

a commitment by Digital

Equipment

Corporation. Digital

Equipment

Corporation assumes no responsibility for any

errors

that

may

appear

this

document.

The software described

this

document

furnished

under

a license

and

may

used

copied only

accordance

with

the

terms

such license.

No responsibility is

assumed

for

the

use

reliability

software on equipment

that

not

supplied by Digital

Equipment

Corporation

its

affiliated companies.

Restricted Rights: Use, duplication,

disclosure

the

S. Government

subject to

restrictions as

set

forth

subparagraph

(

( 1) (

)

the Rights

Technical

Data

and

Computer Software clause

DFARS 252.227-7013.

Equipment

Corporation 1989, 1992

Printed

U.S.A.

The following

are

trademarks

Digital

Equipment Corporation:

SSU,

VMS,

VT,

VT52,

VTlOO,

VT220,

VT320,

VT420,

and

the

DIGITAL

logo.

ADP

trademark

Automatic

Data

Processing, Inc.

Kodak is a registered

trademark

Eastman Kodak

Co.

OLIVE'l'TI

registered

trademark

Ing. C.

Olivetti

& C.,·S.p.A.

UNIX

a registered

trademarlt

UNIX System Laboratories, Inc.

This document was

prepared

and

published by Educational Services Development

and

Publishing, Digital

Equipment

Corporation.

Contents

About This Guide

Vll

1 VT420 Models

and

Features

1.1 VT420 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 VT420 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Troubleshooting and Testing

2.1

2.2

2.2.1

2.2.2

2.2.3

2.2.4

2.2.5

2.2.6

2.2.7

2.2.8

2.3

2.4

Troubleshooting

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

VT420 Self-Tests

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

Before

You

Start

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

How

to Type

Escape Character

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

Power-Up Self-Test

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

DEC-423

Port

Loopback Test (6-Pin)

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

RS-232 Port

Data

Lines Loopback Test

(25-Pin, Worldwide Model Only)

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

RS-232 Port Control Lines Loopback Test

(25-Pin, Worldwide Model Only)

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

Printer

Port

Loopback Test (6-Pin)

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

Screen Alignment Test

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

Printer

Problems

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

Error

Codes

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

iii

Contents

Removing

and

Replacing FRUs

3.1

Top

Cover........................................

3.2 CRT/Yoke/Bezel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.3 Terminal Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.5

CRT

Disposal (Digital Service Representatives Only) . . . . . . 38

4 Adjusting

The

Video Monitor

4.1 Aligning

the

Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.2 Monitor Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.2.1 Before

You

Start

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.2.2 Displaying

the

Screen Test

Pattern

. . . . . . . . . . . . . . . . . . 46

4.2.3 Screen Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

4.2.4

4.2.5

4.2.6

4.2.7

4.2.8

4.2.9

4.2.10

Subcontrast

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

Rotation

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

Horizontal Width

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

Vertical Height

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

Vertical Linearity

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

Centering

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

Focus

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

Using

Set-Up

5.1 Displaying Set-Up

Screens.

. . . . . . . . . . . . . . . . . . . . . . . . . . 51

5.2 Changing Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

5.3 Saving Set-Up Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

5.4 Recalling Set-Up

Values.............................

A Modems, Cables, and Documentation

A.1 Modems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

A.2 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

A.3 Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Contents v

B VT420 Recommended Spares

B.1 VT420 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

B.2 Recommended Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

B.3 Keyboard Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

C Physical/Functional Diagrams

Index

Figures

2-1

VT420 Video Terminal with Keyboards . . . . . . . . . . . . . . . . . 5

2-2

VT420

Rear

Connector Panel

and

Loopback Connectors . . . . 15

4-1

Set-Up Directory

Screens.

. . . . . . . . . . . . . . . . . . . . . . . . . . . 43

4-2

Screen Align Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

4-3

Monitor Adjustment Controls . . . . . . . . . . . . . . . . . . . . . . . . . 45

4-4

Screen Test

Pattern

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4-5

Rotation

and

Centering

Adjustment.

. . . . . . . . . . . . . . . . . . . 48

5-1

Set-Up Directory

Screens...

. . . . . . . . . . . . . . . . . . . . . . . . . 52

A-1

VT420 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

C-1

VT420

North

American Model . . . . . . . . . . . . . . . . . . . . . . . . 64

C-2

VT420 Worldwide Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Tables

1-1

VT420 Model

Differences...

. . . . . . . . . . . . . . . . . . . . . . . . . 3

2-1

Troubleshooting

the

VT420 . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2-2

VT420 Self-Test

Chart

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2-3

VT420 Display

Error

Codes . . . . . . . . . . . . . . . . . . . . . . . . . . 20

This guide describes how to service

the

VT420 monochrome video

terminal.

The

guide

for Digital's service personnel.

The guide

has

five chapters

that

cover

the

following topics:

VT420 models

and

features

Troubleshooting

and

testing

Removing

and

replacing field replaceable units (FRUs)

Adjusting

the

video monitor

Using set-up

Appendices provide information on

the

following topics:

Modems, cables,

and

documentation

VT420 models

and

recommended spares

Physical/functional diagrams

Tools

Required

You

need

the

following tools to service

the

VT420 video terminal:

Tool

Anode discharge

t.ool

25-pin, RS-232 EIA loopback connector

Metric

measuring

tape

Two

6-pin, DEC-423 loopback connectors (modularjack)

Phillips screwdriver,

number

Tuning

wand

Video

alignment

tool

Part

Number

29-24717-00

12-15336-00

29-25342-00

12-25083-01

29-11005-00

29-23189-00

29-26128-00

vii

viii About This Guide

Conventions

The

following conventions

are

used

in this guide:

Warnings

Cautions

Notes

Set-up

features

ANSI keyboard keys

(LK401

LK421)

keyboard keys

(LK443

LK444)

ANSI

keys

(with

keys)

RS-232

Provide information to

prevent

personal injury.

Provide information to

prevent

damage to equipment.

Provide

general

operatinginformation.

The

names

set-up

features

appear

bold

type.

Example:

Use

the

save

feature

the

Set-Up Directory

screen.

Set-up

feature

settings

and

fields

appear

this

type.

These

are

the

settings

that

appear

the

screen.

Example: Select

the

Screen

Align

field.

Appear

normal

text

Example:

Press

the

IRetum

Ikey.

Appear

bold

text

a§!.

Example:

Press

the

la.turn

Ikey.

When

(LK.4431LK444)

command

sequence differs

from

ANSI (LK.401/LK421) command sequence,

the

key

sequence

appears

parentheses

after

the

ANSI

key sequence.

Example:

Press

the

IRetum

key

4Enter~.

Used

represent

electrical

standard

EIA

232-D, which

replaces electrical

standard

RS-232-C.

This

abbreviation for

part

number.

1.1

VT420 Models

The VT420 is a monochrome text terminal

that

provides all VT320

features plus enhancements. The VT420

has

a 359 mm (14-inch) diagonal

monitor with a flat, antiglare screen. The monitor can display 24, 25, 36,

or 48 lines of

text

an 80- or 132-column format. The

last

line

each

session is reserved for a

status

line.

attachable tilt-swivel

base

lets

the

user

adjust

the

viewing angle for optimum comfort.

There

are

three

models of

the

VT420 video terminal:

•

North

American

(VT

mode)

• Worldwide

(VT

mode)

• Worldwide

(VT

mode

and

PC TERM mode)

The worldwide models come in two versions,

standard

and low-emission.

1.2 VT420 Features

The following

list

includes

the

features

that

are

common to

the

North

American

and

model

and

two worldwide models. Table 1-1

lists

the

differences between

the

three models. The worldwide model with PC

TERM mode can

use

the

standard

ANSI (LK401),

short

ANSI (LK421),

or PC (LK443/LK444) keyboard. See Installing and Using the VT420

Video Terminal with PC Terminal Mode for details on the features ofthe

different keyboards.

420 Models

and

Features

Common

Features

• Two-session capability

• Local copy and

paste

feature

• Off-screen page memory

• Ability to display 24, 25, 36,

48 lines/screen

• Screen centering capability

• Screen overscan

• FCC Class A compliance

•

Two

6-pin, DEC-423 connectors (One is for

the

primary

host

port, and

one is for the secondary

host

printer port. Both

have

DEC-423 local

direct-connect capability.)

• Asynchronous communication

to 38.4Kbits/second

•

Four

operating modes:

VT400 mode, 7-bit controls (default)

VT400 mode, 8-bit controls

VTlOO

mode

VT52 mode

• Ability to store macros

• One full-screen window or two horizontal split-screen windows

• Screen saver

•

Character

sets:

U.S. ASCII

DEC Supplemental Graphic

ISO Latin Alphabet No. 1

ISO Latin-1 Supplemental

DEC Special Graphic

DEC Technical

Downloadable character

set

• Terminal status line

• Keyboard indicator

the

last

line of

the

screen

• Ability to disable

enable keys

E.!I

through

• Extended keyboard reports

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