Wyse WY-30 Manual de usuario

WY-30

Maintenance

Manual

For Service Manuals

MAURITRON SERVICES

8Cherry Tree Road, Chlnnor

Oxfordshire, OX9

4QY.

Tel (01844) 351694

Fax (01844) 352554

email:·[email protected]

It'.

WYSE

OVERVIEW

This

maintenance

manual

contains

information

how

service

and

repair

the

WY-30

terminal.

assume

you

are

qualified

service

technician

with

experience

terminal

and

computer

repair.

take

full

advantage

this

manual,

suggest

you

read

the

information

the

order

presented.

HOW

USE

THIS

MANUAL

This

manual

divided

into

seven

chapters

and

four

appendixes.

Chapter

one

provides

important

information

for

the

technician

who

has

never

serviced

this

terminal

before.

you

are

already

familiar

with

the

terminal,

the

technical

information

Appendix

can

remind

you

about

the

terminal.

Here

asummary

this

manual:

Chapter

"General

Information,"

describes

the

terminal,

including

information

about

internal

functions,

input/output

(I/O),

telecommunications,

environmental

needs,

and

operator

controls.

Chapter

"Removal

and

Replacement

Procedures,"

shows

you

how

take

the

terminal

apart

and

put

back

together

again.

Chapter

"Troubleshooting,"

tells

fix

problems

with

the

terminal.

needed

for

troubleshooting,

quick

flowchart.

you

what

look

for

and

how

includes

list

tools

reference

guide,

and

Chapter

"Adjustments

and

Alignments,"

describes

power

supply

and

monitor

adjustments

that

control

the

quality

the

display.

Chapter

"Illustrated

Parts

List,"

includes

list

display

and

keyboard

assembly

parts.

Chapter

"Theory

Operation,"

describes

the

terminal

operation

function.

Chapter

"Schematics,"

contains

schematic

representations

all

the

terminal's

circuits.

iii

Appendix

"Specifications,"

lists

the

terminal's

specifications.

Appendix

"Connector

Assignments,"

lists

the

signals

each

the

MODEM

and

the

AUX

ports

located

the

rear

panel

the

terminal.

Appendix

"Test

Connectors,"

describes

how

make

diagnostic

hood

test

connectors.

Appendix

"Display

Inspection

With

the

Reticle,"

describes

how

check

the

terminal's

display

with

special

tool,

the

reticle.

REFERENCE

MANUALS

The

following

publications

provide

additional

information

about

the

termina

WY-30

User's

Guide,

Document

880093-01

WY-30

Programmer's

Guide,

Document

880093-02

TABLE

CONTENTS

OVERVIEW

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

iii

GENERAL

INFORMATION

Introduction

1-2

High

Level

Functional

Description

1-2

Microcomputer

1-2

Memory

1-2

Terminal

Control

···············

1-2

Input/Output

Devices

1-2

Environment

1-4

Operator

Interfaces

1-5

Setup

Parameters

1-6

Cleaning

1-7

REMOVAL

AND

REPLACEMENT

PROCEDURES

Overview

2-2

Before

You

Start

2-2

Removing

and

Replacing

Assemblies

the

Keyboard

Mod

ule

Removing

and

Replacing

Assemblies

the

Terminal

Module

2-5

TROUBLESHOOTING

Before

You

Start

3-2

Troubleshooting

Quick

Reference

Guide

3-3

Troubleshooting

Flowchart

3-3

Troubleshooting

Aids

3-8

ADJUSTMENTS

AND

ALIGNMENTS

Before

You

Start

4-2

Power

Adjustments

4-3

Does

the

Terminal

Meet

the

Display

Specifications?

4-4

Aligning

the

Terminal

Display

4-6

Adjustments

4-7

ILLUSTRATED

PARTS

LIST

Introduction

5-2

Terminal

Display

Assembly

Exploded

View

5-3

Keyboard

Assembly

Exploded

View

5-4

Terminal

Components

List

5-5

Keyboard

Components

List

5-8

Terminal

Board

Assembly

Layout

5-9

THEORY

OPERATION

Introduction

6-2

Microcomputer

and

Logic

6-2

Power

Supply

and

Monitor

Circuitry

6-10

Keyboard

6-13

Communication

Ports

6-13

Terms

and

Abbreviations

········

6-13

SCHEMATICS

Keyboard

PCB

··············

7-3

Terminal

PCB

(Logic)

7-5

Terminal

PCB

(Monitor/Power

Supply)

7-7

APPENDIXES

Specifications

···

A-1

Connector

Assignments

B-1

Test

Connectors

C-1

Display

Inspection

with

the

Reticle

D-1

INDEX

1-1

LIST

FIGURES

1-1

Keyboard

·······

1-3

1-2

Terminal

Dimensions

1-4

1-3

Operator

Interfaces

··········

1-5

2-1

Terminal

Modules

2-2

Keyboard

Assembly

2-4

2-3

Removing

the

Terminal

Enclosure

2-6

2-4

Replacing

the

Fuse

2-7

2-5

Removing

the

Terminal

PCB

•••.••..••.••.•••...••••••••.

2-9

2-6

Removing

the

CRT/Yoke

Assembly

2-11

2-7

Replacing

the

Yoke

2-12

2-8

Discharging

the

Anode

Before

Removal

2-13

2-9

Discharging

the

Anode

Before

Installation

2-14

3-1

Troubleshooting

Flowchart

3-4

LIST

FIGURES

Continued

4-1

Power

Supply

Component

Layout

4-3

4-2

tmen

Locations

4-8

4-3

Yoke

Lock

the

CRT

Neck

4-10

4-4

Display

Magnets

4-11

4-5

Centering

Rings

4-12

5-1

Terminal

Display

Assembly

Exploded

View

5-3

5-2

Keyboard

Assembly

Exploded

View

5-4

5-3

Terminal

Board

Assembly

Layout

5-9

6-1

Memory

Map

6-3

7-1

Keyboard

PCB

Schematic

7-3

7-2

Terminal

PCB

Schematic

(Logic)

7-5

7-3

Terminal

PCB

Schematic

(Monitor/Power

Supply)

7-7

D-1

Video

Inspection

Reticle

D-1

D-2

Checking

Width

and

Height

D-3

Checking

Straightness,

Pincushioning,

Centering,

and

Vertical

Linearity

D-4

LIST

TABLES

3-1

Troubleshooting

Quick

Reference

Guide

3-3

3-2

Terminal

Installation

Checklist

3-8

3-3

Power-On

Self-Test

Error

Messages

3-11

3-4

Diagnostic

Self-Test

Error

Messages

3-12

3-5

Terminal

PCB

Circuit

Isolation

Jumpers

3-13

4-1

Display

Problems

and

Adjustments

4-7

4-2

Screen

Areas

Affected

Display

Magnets

4-11

5-1

Terminal

PCB

Components

List

5-5

5-2

Keyboard

Components

List

5-8

5-3

Diagnostic

Self-Test

Connectors

5-11

6-1

6800

Interrupt

Sources

6-3

6-2

Values

Loaded

into

CRTC

6-7

6-3

Screen

Attribute

Assignments

6-8

B-1

MODEM

Port

Assignments

(DTE) B-1

B-2

AUX

Port

Assignments

(DTE) B-1

vii

GENERAL

INFORMATION

Introduction

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

1-2

High

Level

Functional

Description

1-2

Microcomputer

1-2

Memory

1-2

Terminal

Control

1-2

Input/Output

Devices

1-2

CRT

Display

1-3

Communications

Interfaces

1-3

Keyboard

1-3

Environment

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

1-4

Operator

Interfaces

1-5

Keyboard

1-5

ower

Cord

1-6

Communications

Cable

1-6

Power

Switch

1-6

Brigh

tness

Slideswi

tch

1-6

Touch/Tilt

Screen

Adjustment

1-6

Setup

Parameters

1-6

Cleaning

1-7

1-1

INTRODUCTION

The

WY-30

low-cost,

entry-level,

ASCII

display

terminal.

consists

display

console

and

detachable

keyboard.

user

enters

information

for

display

from

the

keyboard.

The

terminal

contains

all

the

electronics

that

support

the

display

and

keyboard.

addition

the

cathode

ray

tube

(CRT)

and

keyboard,

the

WY-30

contains

two

independent

communications

interfaces.

Peripherals,

including

hard-copy

printer

plotter,

can

attached

the

terminal

with

interface

connectors

the

rear

panel.

The

component

parts

are

organized

around

and

controlled

the

microprocessor.

The

microprocessor

controls

all

internal

data

manipulation

and

processing

functions.

HIGH

LEVEL

FUNCTIONAL

DESCRIPTION

The

terminal

consists

microprocessor

and

logic,

CRT

controller

and

associated

control

logic,

input/output

(I/O)

devices,

monitor

and

power

supply

circuitry,

and

CRT.

All

circuitry

mounted

on a

single

printed

circuit

board

(PCB),

the

terminal

PCB.

The

microprocessor

controls

all

basic

functions.

MICROCOMPUTER

The

microcomputer

comprises

clock

and

synchronization

circuit,

program

memory,

RAM,

reset

circuit,

and

the

heart

the

terminal--a

2-megahertz,

6800-family

microprocessor--the

68BOO.

MEMORY

Terminal

memory

consists

RAM

and

ROM.

The

microprocessor

uses

RAM

for

buffers,

variable

storage

and

system

stack.

The

video

interface

this

RAM

for

screen

refresh.

Program

memory,

ROM,

holds

all

the

terminal

control

firmware.

TERMINAL

CONTROL

Functions

the

terminal

control

firmware

include

keyboard

scanning,

video

control,

data

transfer

and

from

the

communication

ports,

and

on-screen

data

manipulation.

INPUT/OUTPUT

DEVICES

I/O

devices

consist

CRT

display,

two

communications

interfaces,

and

keyboard.

1-2

CRT

Display

The

terminal

has

14-inch,

flat-screen

CRT.

displays

rows

characters,

columns,

and

two

control

rows

(one

for

terminal

status

and

the

other

for

label,

message,

and

setup).

The

CRT

controller

reads

displayed

characters

from

RAM

on a

direct

memory

access

(DMA)

basis.

Communications

Interfaces

The

terminal

has

two

asynchronous

serial

interfaces

that

conform

with

the

EIA

standard

RS-232C.

Data

rates

are

set

for

both

interfaces

together.

These

parameters

are

operator

controlled

and

are

defined

"Setup

Parameters"

this

chapter.

Both

interfaces

can

communicate

data

rates

38.4K

bits

per

second

(bps).

Keyboard

The

keyboard

consists

keys

mounted

on a

single-sided

PCB.

All

keys

are

momentary

action

key

switches.

The

microprocessor

periodically

scans

the

keys

checking

for

key

closures.

Figure

1-1

shows

the

keyboard.

You

can

find

detailed

description

Chapter

"Theory

Operations."

Figure

1-1

Keyboard

1=6

Ins

Char

Del

Char

Clr

Line Replae'

ins Line

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1-3

ENVIRONMENT

The

terminal

can

placed

table,

desktop,

any

other

vibration-free

horizontal

surface

that

free

from

lint

and

dust.

Abnormally

bright

room

light

direct

sunlight

can

interfere

with

the

display."

Figure

1-2

shows

the

WY-30

dimensions.

The

user

should

allow

three

inches

clearance

all

sides

when

installing

the

terminal.

Users

can

install

the

terminal

near

most

other

types

electrical

electronic

equipment

without

serious

interference.

They

should

avoid

locations

near

strong

magnetic

fields

that

can

distort

and

interfere

with

the

operating

servicing

the

video

display.

Figure

1-2

Terminal

Dimensions

2'14"

Extended

'12"

Flat

Ambient

room

temperature

should

never

exceed

degrees

Celsius

(113

degrees

Fahrenheit)

when

the

terminal

on;

however,

the

terminal

needs

special

cooling.

Users

should

make

sure

the

rear

the

terminal

has

free

flow

air.

They

shouldn't

set

the

terminal

sound-deadening

devices

that

block

the

flow

air

beneath

it.

1-4

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