Brother International FAX 275 Service Manual - Page 144

2.

TROUBLESHOOTING

2.1

Introduction

This

section

gives

the

service

personnel

some

of

the

troubleshooting

procedures

to

be

fol-

lowed

if

an

error

or

malfunction

occurs

with

the

facsimile

equipment.

It

is

impossible

to

an-

ticipate

all

of

the

possible

problems

which

may

occur

in

future

and

determine

the

trouble-

shooting

procedures,

so

this

section

covers

some

sample

problems.

However,

those

samples

will

help

service

personnel

pinpoint

and

repair

other

defective

elements

if

he/she

analyzes

and

examines

them

well.

2.2

Precautions

Be

sure

to

observe

the

following

to

prevent

the

secondary

troubles

from

happening:

(1)

Always

unplug

the

AC

power

cord

from

the

outlet

when

removing

the

covers

and

PCBs,

adjusting

the

mechanisms,

or

conducting

continuity

testing

with

a

circuit

tester.

(2)

When

disconnecting

the

connectors,

do

not

pull

the

lead

wires

but

hold

the

connector

housings.

•

Before

handling

the

PCBs,

touch

a

metal

portion

of

the

machine

to discharge

static

electricity

charged

in

your

body.

•

When

repairing

the

PCBs,

handle

them

with

extra

care.

After

repairing

the

defective

section,

be

sure

to

check

again

if

the

repaired

section

works

cor-

rectly.

Also

record

the

troubleshooting

procedure

so

that

it

would

be

of

use

for

future

trouble

occurrence.

(

3

)

2.3

Checking

prior

to

Troubleshooting

Prior

to

proceeding

to

the

troubleshooting

procedures,

check

that:

(1)

Each

voltage

level

on

AC

input

lines

and

DC

lines

is

correct.

(2)

All

cables

and

harnesses

are

firmly

connected.

(3)

None

of

the

fuses

are

blown.

Brother International FAX 275 Service Manual - Page 144

Troubleshooting

Page 144 highlights