Brother International DB2-B737 Network Users Manual - English - Page 26

TROUBLESHOOTING)

*

When

the

troubleshooting

is

required,

inspect

separately

such

main

parts

as

the

condo]

box,

motor,

operation

panel

box,

motor,

operation

panel

box,

synchronizer,

power

switch,

machine

solenoid

and

presser

foot

lifter.

*When

the

control

box

is

found

to

be

out

of

order,

inspect

the

control

circuit

board,

power

board,

treadle

unit,

and

transformer

separately.

*Whatever

troubles

you

encounter,

check

whether

the

connectors

are

secured.

*Pay

great

attention

to

the

maintenance

of

the

power

and

control

circuit

boards

because

the

high

voltage

is

applied.

*

Refer

to

the

circuit

drawings

provided

separately

to

check

the

quality

of

the

detailed

parts

(semiconductors)

for

maintenance.

Trouble

Check

Point

Parts

to

Be

Replaced

Ref.

Page

1.

The

machine

does

not

run

even

by

stepping

on

the

treadle

while

the

power

switch

is

ON.

Check

the

power

source

voltage.

(Try

to

plug

into

another

outlet.)

(1)

Power

indicator

lamp

(red

LED)

does

not

go

ON.

(2)

Power

indicator

lamp

(red

LED)

is

ON.

Fuse

blown:

3

-phase

5

A

fuse

(2

pcs.)

Single-phase

15

A

fuse

(1

pc.)

(Replace

with

new

ones.)

Fuse

Control

box

Check

whether

the

connectors

are

secured.

(Check

especially

the

6P

connector

of

the

motor.)

Control

box

2.

The

machine

stops

during

operation.

(1)

Power

indicator

lamp

(red

LED)

flickers.

(2)

Power

indicator

lamp

(red

LED)

does

not

flickers.

The

machine

pulley

is

so

heavy

to

turn

man

-

ually.

[The

machine

or

the

motor

(brake

lining)

is

locked.

Remove

the

trouble

cause

and

turn

on

the

power.

Then

the

machine

runs

normally.)

Power

source

voltage

drop.

(The

motor

is

not

out

of

order.)

3.

The

machine

starts

running

just

by

turning

on

the

power

switch

even

with

the

treadle

set

in

the

neutral

position.

Control

box

4.

The

machine

does

not

run

at

high

speed.

Check

whether

the

high

speed

volume

is

not

set

at

"tow."

(The

setting

range

of

the

high

speed

volume

is

from

230

spm

to

the

maximum.►

Power

switch

assembly

Control

box

5.

The

machine

does

not

stop

even

if

the

treadle

is

returned

to

the

neutral

position.

If

the

machine

stops

after

turning

off

the

power

switch,

removing

the

synchronizer

switch,

then

turning

it

on

again,

the

synchronizer

is

out

of

order.

(Use

as

a

clutch

motor

for

a

while.)

Synchronizer

Control

box

6.

Abnormal

motor

running

(variation

in

rpm)

Motor

P25

7.

The

brake

produces

abnormal

noises

during

operation.

Adjustment

of

brake

clearance

Remove

washer.

P

11

8.

The

operations

related

to

the

machine

sole-

noid

do

not

work.

(thread

trimming,

reverse

rotation,

thread

wiper,

and

presser)

Check

the

8

A

fuse

provided

on

the

control

cir-

cuit

board.

8

A

fuse

Control

box

9.

Abnormality

related

to

automatic

backtack-

ing,

etc.

Control

box

Operation

box

P26

10.

The

machine

does

not

make

proper

hem

stop,

using

the

sensor.

If

the

thickness

cannot

be

monitored

with

the

[ply

sensor]

LED,

or

the

monitoring

is

unstable,

adjust

by

pressing

the

[ply

sensor]

key

again.

If

the

[ply

sensor]

LED

does

not

go

on

even

after

the

adjustment

above,

check

the

connec-

tor

for

the

sensor.

Brother International DB2-B737 Network Users Manual - English - Page 26

Troubleshooting

Page 26 highlights