Epson SQ-B50/2550 Manuale utente

EPSON

Y502999010-A

EPSON

TERMINAL

PRINTER

5Q-B50/2550

TECHNICAL

MANUAL

SQ.-BSO/2SS0

TECHNICAL

MANUAL

EPSON

NOTICE

•

All

rights

reserved.

Reproduction

any

part

this

manual

any

from

whatsoever

without

SEIKO EPSON's

express

written

permission

forbidden.

•

The

contents

this

manual

are

subject

change

without

notice.

•

All

efforts

have

been

made

ensure

the

accuracy

the

contents

this

manual.

However,

should

any

errors

detected,

SEIKO EPSON

would

greatly

appreciate

being

informed

them.

•

The

above

notwithstanding

SEIKO EPSON

can

assume

responsibility

for

any

errors

this

manual

the

consequences

thereof.

1989

SEIKO EPSON CORPORATION

Nagano,

Japan

REV.-A

PRECAUTIONS

Precautionary

notations

throughout

the

text

are

categorized

relative

personal

injury,

and

damage

equipment:

DANGER

Signals

precaution

which,

ignored,

could

result

in serious

fatal

personal

injury. Great

caution

should

exercised

performing

procedures

preceded

aDANGER headings.

WARNING

Signals

precaution

which,

ignored,

could

result

damage

equipment.

The

precautionary

measures

itemized

below

should

always

observed

when

performing

repair/main-

tenance

procedures.

DANGER

EXPLOSION

BATTERY

INCORRECTRY REPLACED.

REPLACE ONLY

WITH

SAME

EQUIVALENT TYPE RECOMMENDED BY SEIKO

EPSON CO. DISCARD USED BATTERIES ACCORDING TO GOVERNMENTS, SAFETY

INSTRUCTION.

ALWAYS

DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE

HOST

COMPUTER

BEFORE PERFORMING

ANY

MAINTENANCE

REPAIR

PROCEDURE.

3. NO

WORK

SHOULD

PERFORMED

THE

UNIT

BY PERSONS UNFAMILIAR

WITH

BASIC SAFETY MEASURES AS DICTATED

FOR

ALL

ELECTRONICS TECHNICIANS

THEIR LINE

WORK.

4. WHEN PERFORMING TESTING AS DICTATED

WITHIN

THIS

MANUAL,

NOT

CONNECT THE

UNIT

TO APOWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN

THE POWER SUPPLY CABLE

MUST

CONNECTED, USE EXTREME CAUTION

WORKING

POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

WARNING

REPAIRS

EPSON PRODUCT SHOULD

PERFORMED ONLY BY AN EPSON

CERTIFIED REPAIR TECHNICIAN.

2. MAKE CERTAIN

THAT

THE SOURCE VOLTAGE

THE SAME AS THE RATED

VOLTAGE, LISTED

THE SERIAL NUMBER/RATING PLATE.

THE EPSON PROD-

UCT HAS APRIMARY-AC RATING DIFFERENT FROM THE AVAILABLE POWER

SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.

ALWAYS

VERIFYTHATTHE EPSON PRODUCT HAS

BEEN

DISCONNECTED FROM THE

POWER SOURCE

BEFORE

REMOVING

REPLACING PRINTED CIRCUIT BOARDS

AND/OR

INDIVIDUAL

CHIPS.

ORDER

TO PROTECT SENSITIVE

J.LP

CHIPS

AND

CIRCUITRY, USE STATIC

DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC

WRIST

STRAPS, WHEN ACCESS-

ING INTERNAL COMPONENTS.

5. REPLACE MALFUNCTIONING COMPONENTS ONLY

WITH

THOSE COMPONENTS

RECOMMENDED

THE MANUFACTURER; INTRODUCTION

SECOND-SOURCE

ICs

OTHER NONAPPROVED COMPONENTS

MAY

DAMAGE THE PRODUCT AND

VOID

ANY

APPLICABLE EPSON WARRANTY.

REV.-A

iii

PREFACE

This

manual

describes

functions,

theory

electrical

and

mechanical

operations,

maintenance,

and

repair

the

50-850/2550.

The

instructions

and

procedures

included

herein

are

intended

for

the

experienced

repair

technician,

and

attention

should

given

the

precautions

the

preceding

page. The

chapters

are

organized

follows:

REV.-A

Chapter

Provides

general

product

overview,

lists

specifications,

and

illustrates

the

main

components

the

printer.

Describes

the

theory

printer

operation.

Discusses

the

options

Includes

step-by-step

guide

for

product

disassembly,

assembly,

and

adjustment.

Provides

Epson-approved

techniques

for

troubleshooting.

Describes

preventive

maintenance

techniques

and lists

lubricants

and

adhesives

required

service

the

equipment

•

The

contents

this

manual

are

subject

change

without

notice.

REV.-A

REVISION

TABLE

REVISION

DATE

ISSUED

CHANGE

DOCUMENT

April

28,

1989

issue

CHAPTER

APPENDIX

TABLE OF

CONTENTS

GENERAL

DESCRIPTION

OPERATING

PRINCIPLES

OPTIONAL

EQUIPMENTS

DISASSEMBL

ASSEMBL

AND

ADJUSTMENT

TROUBLESHOOTING

MAINTENANCE

REV.-A

Indice

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