Wyse WY-60 User manual

WY-60

Maintenance

Manual

For Service Manuals

MAURITRON

SERVICES

8Cherry Tree Road, Chinnor

Oxfordshire,

OX9

4QY.

Tel

(01844) 351694

Fax (01844) 352554

email:[email protected]

WYSE

...

OVERVIEW

This

maintenance

manual

contains

information

how

service

and

repair

the

WY-60

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.

The

first

chapter

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

summary

this

manual:

Chapter

wGeneral

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

wTroubleshooting,"

tells

you

what

look

for

and

how

fix

problems

with

the

terminal.

includes

list

tools

needed

for

troubleshooting,

quick

reference

guide,

and

flowchart.

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

Operations,"

describes

the

terminal

operation

function.

Chapter

"Schematics

and

PCB

Assembly

Drawings,"

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

terminal:

~Y-60

User's

Guide,

Document

880259-02

~Y-60

Programmer's

Guide,

Document

880261-01

TABLE

CONTENTS

OVERVIEW

iii

GENERAL

INFORMATION

Introduction

1-1

High

Level

Functional

Description

1-2

Microcontroller

1-2

Memory

••••••••••••••••.••••••••••••••.••••••••••••••••••.••

1-2

Terminal

Control

1-3

Input/Output

Devices

1-3

Installation,

Operation,

and

Care

1-4

REMOVAL

AND

REPLACEMENT

PROCEDURES

Overview

Remov

ing

Keyboard

Remov

ing

Terminal

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

and

Replacing

Assemblies

the

Modules

and

Replacing

Assemblies

the

Module

2-1

2-3

2-9

TROUBLESHOOTING

Before

You

Start

3-1

Primary

Troubleshooting

Proced

ures

3-2

Troubleshooting

Quick

Reference

Guide

3-4

Troubleshooting

Flowchart

3-5

Additional

Troubleshooting

Procedures

3-12

ADJUSTMENTS

AND

ALIGNMENTS

Before

You

St3.rt

4-1

Checking

Display

Specifications

4-2

Aligning

the

Termin3.l

Display

4-5

Adjusting

the

Terminal

Display

4-10

Test

Patterns

4=15

5ILLUSTRATED

PARTS

LIST

Introduction

5-1

Printed

Circuit

Board

Layout

and

Component

Identification

5-2

Terminal

Display

Assembly

Exploded

View

5-3

Keyboard

Assemblies

Exploded

Views

5-4

Terminal

PCB

Components

List

5-6

Terminal

Board

Assembly

Layout

5-13

WY-60

Full-Touch

Keyboard

PCB

Components

List

5-14

WY-60

Full-Touch

Keyboard

PCB

Layout

5-14

316X-Style

Keyboard

PCB

Components

List

5-17

316X-Style

Keyboard

PCB

Layout

5-17

AT-Style

Keyboard

PCB

Components

List

5-17

AT-Style

Keyboard

PCB

Layout

5-17

Diagnostic

Tools

5-20

THEORY

OPERATIONS

Terminal

PCB

Logic

Components

Functional

Description

6-1

Monitor/Power

Supply

Components

Functional

Description

6-6

Keyboard

6-8

Additional

Functional

Descriptions

6-9

Raster

Scan

Terminology

6-13

7SCHEMATICS

AND

PCB

ASSEMBLY

DRAWINGS

Keyboard

PCB

Schematic,

WY-60

ASCII

7-3

Keyboard

PCB

Schematic,

AT-Style

7-5

Keyboard

PCB

Schematic,

316X-Style

7-7

Terminal

PCB

Schematic,

Logic

7-9

Terminal

PCB

Schematic,

Monitor/Power

Supply

7-13

Keyboard

PCB

Assembly

Drawing,

WY-60

ASCII

7-15

Keyboard

PCB

Assembly

Drawing,

AT-Style

7-17

Keyboard

PCB

Assembly

Drawing,

316X-Style

7-19

Terminal

PCB

Assembly

Drawing

7-21

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

1-2

2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

2-9

2-10

-11

3-1

4-1

4-2

4-3

4-4

4-5

4-6

4-7

5-1

5-2

5-3

5-4

5-5

5-6

5-7

6-1

6-2

6-3

7-1

7-2

-3

-4

7-4

7-5

-6

7-7

7-8

Terminal

Installed

1-4

User

Controls

1-5

Terminal

Modules

2-2

Keyboard

Styles

2-3

ASC

Keyboard

Assembl

2-5

316X-

and

AT-Style

Keyboard

Assembly

2-8

Removing

the

Terminal

Enclosure

2-9

Replacing

the

Fuse

2-10

Removing

the

Terminal

PCB

2-12

Removing

the

CRT/Yoke

Assembly

2-14

Replacing

the

Yoke

2-15

Discharging

the

Anode

Before

Removal

2-17

Discharging

the

Anode

Before

Installation

2-18

Troubleshooting

Flowchart

3-6

Power

Supply

Component

Layout

4-8

Adj

tmen

Loca

ions

-10

Yoke

Lock

the

CRT

Neck

4-12

Centering

Rings

·.

4-13

Display

Magnets

4-13

Pattern

4-15

Pattern

4-16

Sample

PCB

5-2

Terminal

Display

Assembly

Exploded

View

5-3

Keyboard

Assemblies

Exploded

Views

5-4

Terminal

Board

Assembly

Layout

5-14

WY-60 ASCII

Keyboard

PCB

Layout

5-16

316X-Style

Keyboard

PCB

Layout

5-18

AT-Style

Keyboard

PCB

Layout

5-20

Terminal

PCB

Logic

Circuitry

Functional

Block

Diagram

6-2

Monitor/Power

Supply

Circuitry

Functional

Block

Diagram

6-7

Keyboard

Block

Diagram

6-8

WY-60 ASCII

Keyboard

PCB

Schematic

7-3

AT-Style

Keyboard

PCB

Schematic

7-5

316X-Style

Keyboard

PCB

Schematic

7-7

Terminal

PCB

Schematic

(Logic)

7-9

Terminal

PCB

Schematic

(Monitor/Power

Supply)

7-13

WY-60

ASCII

Keyboard

PCB

Assembly

Drawing

7-15

AT-Style

Keyboard

PCB

Assembly

Drawing

7-16

316X-Style

Keyboard

PCB

Assembly

Drawing

7-17

Terminal

PCB

Logic

Assembly

Drawing

7-18

vii

•

...

··,·

·o:D"'¥"~'

...

;

....

··_--·-

I.J.f

Oi~'tt:'Ior1wiA

...

,....._..

LIST

FIGURES,

Continued

B-1

Numbers

(MODEM

and

AUX

Ports)

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

B-1

D-1

Video

Inspection

Reticle

D-1

D-2

Checking

Width

and

Height

;D-3

D-3

Checking

Straightness,

Pincushioning,

Centering,

and

Vertical

Linearity

D-4

LIST

TABLES

3-1

Module

Level

Troubleshooting

Quick

Reference

Guide

3-5

3-2

Terminal

Installation

Checklist

3-13

3-3

Terminal

PCB

Circuit

Isolation

Jumpers

3-16

4-1

Display

Problems

and

Their

Adjustments

4-9

4-2

Screen

Areas

Affected

Display

Magnets

4-14

5-1

Reference

Designator

Letters

5-2

Terminal

PCB

Components

List

5-7

5-3

WY-60

ASCII

Keyboard

PCB

Components

List

5-15

5-4

316X-Style

Keyboard

PCB

Components

List

5-17

5-5

AT-Style

Keyboard

PCB

Components

List

5-19

5-6

Diagnostic

Self-Test

Connectors

5-21

6-1

Clock

Rates

6-4

6-2

8051

Port

Assignments

6-9

B-1

MODEM

Port

Connector

Assignments

(DTE)

B-1

B-2

Typical

Modem

Assignments

B-2

B-3

AUX

Port

Connector

Assignments

(DCE)

B-2

viii

GENERAL

INFORMATION

Introduction

1-1

High

Level

Functional

Description

1-2

Microcontroller

1-2

Memory

1-2

Terminal

Control

1-3

Input/Output

Devices

1-3

CRT

Display

1-3

Communications

Interfaces

1-3

Keyboard

1-3

Installation,

Operation,

and

Care

1-4

Installation

1-4

Opera

ion

1-5

Care

1-6

INTRODUCTION

This

versatile,

full-function

ASCII

terminal

includes

the

following

features:

Choice

three

different

keyboRrds

seven

pages

display

memory

Choice

26-

44-line

80-

132-column

display,

with

split

screen

capability

and

selectable

status

lines

Hidden

character

display

attributes

that

can

combined

with

double-high/double-wide

line

attributes;

nonhidden

attribute

modes

Seven

predefined

character

sets

and

512

user-definable

characters

Fifteen

operating

modes

with

personalities

characteristic

other

terminals,

including

and

PC/AT

terminal

modes

Bidirectional,

interchangeable

communications

interfaces

1-1

WyseWorks

desktop

accessories

Wyseword

WordStar

key

definitions

The

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

terminal

contains

two

independent

communications

interfaces.

Peripherals,

including

hard-copy

printer

plotter,

can

attached

the

terminal

through

the

interface

connectors

the

rear

panel.

The

component

parts

are

organized

around

and

controlled

the

microcontroller.

The

microco~troller

controls

all

internal

data

manipulation

and

processing

functions.

HIGH

LEVEL

FUNCTIONAL

DESCRIPTION

The

terminal

consists

microcontroller

and

logic,

CRT

controller

and

associated

control

logic,

gate

array,

input/output

(I/O)

devices,

monitor

and

power

supply

circuitry,

and

CRT.

All

circuitry

mounted

on a

single

printed

circui

board

(PCB),

the

terminal

PCB.

The

microcontroller

controls

all

basic

functions.

MICROCONTROLLER

The

heart

the

terminal,

the

8051

microcontroller,

8-bit,

single-component

microcontroller

that

has

128

bytes

random

access

memory

(RAM), 32

I/O

lines,

three

16-bit

counter/timers,

full-duplex

universal

asynchronous

receiver/transmitter

(UART),

and

integral

interrupt

and

clock

circuitry.

MEMORY

The

terminal

memory

consists

EEPROM,

RAM,

EPROM,

and

ROM.

The

terminal

EEPROM

the

X2404,

which

stores

all

user

selected

setup

parameters.

Terminal

RAM

includes

the

Character

RAM,

the

Attribute

RAM,

and

the

Font

RAM.

hidden

attribute

mode,

the

Character

RAM

holds

character

for

each

character

cellon

the

screen.

The

Attribute

RAM

holds

attribute

for

each

character

cellon

the

screen.

The

Font

RAM

holds

four

predefined

character

sets

and

that

may

include

additional

user-defined

characters.

Terminal

ROM

includes

the

Code

ROM,

which

holds

the

program

code

that

operates

the

terminal,

and

the

ROM

internal

the

8051

that

supports

the

Code

ROM.

1-2

TERMINAL

CONTROL

Terminal

control

components

include

the

8051

microcontroller

described

above

and

the

2672

programmmable

video

timing

controller

(PVTC). The

2672

controls

vertical

and

horizontal

timing,

consecutive

addressing

for

the

display

memory,

the

microcontroller-display

buffer

interface,

and

consecutive

addressing

row

buffers.

The

PVCT

controller

reads

displayed

characters

and

attributes

from

their

respective

RAMs

DMA

basis,

sending

this

information

the

gate

array.

The

gate

array

generates

the

video

signals

that

control

the

display.

Functions

the

terminal

firmware

include

keyboard

scanning,

programming

the

video

controller,

data

transfer

and

from

the

communication

ports,

and

data

manipulation.

INPUT/OUTPUT

DEVICES

I/O

devices

consist

CRT

display,

two

communications

interfaces,

and

keyboard.

CRT

Display

The

terminal

has

14-inch,

flat-screen

CRT.

displays

rows

characters

and

132

columns.

Available

phosphor

colors

for

the

CRT

include

green,

amber,

and

white.

Communications

Interfaces

The

terminal

has

two

asynchronous

serial

interfaces

that

conform

with

the

EIA

standard

RS-232C.

Data

rates

are

set

independently

for

both

interfaces.

These

parameters

are

operator

controlled

and

are

defined

"Setup

Parameters"

the

User's

Guide.

The

MODEM

interface

can

communicate

data

rates

38.4K

bits

per

second

(bps).

The

AUX

interface

can

communicate

data

rates

19.2K

bps.

Keyboard

The

terminal

available

with

three

keyboards:

the

WY-60

ASCII

keyboard,

316X-style

keyboard,

and

AT-style

keyboard.

Each

has

standard

four-wire

interface

with

the

terminal.

All

keys

are

momentary

action

key

switches.

The

microprocessor

periodically

scans

the

keys,

checking

for

key

closures.

Figure

2-2

Chapter

shows

the

keyboards.

You

can

find

add

ional

rm a

tion

out

the

yboard

Cha

pte

"Theo

Operations"

and

Chapter

"Schematics."

1- 3

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