Brother BAS-304A, BAS-311A, BAS-314A, BAS-315A, BAS-326A Service Manual

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SERVICE MANUAL

{ELECTRICAL)

FOR

'

..

,·..

.

..

. ·

..

..._

..

·

BAS-300A

BAS-304A•311A•314A•315A

SERIES

.. /-·---

=

326A•326LA•341A•342A

,

This service

can

be made into a book since electrical descriptions

for

the

BAS-300A series

manual

has

been compiled so

are

very similar.

that

it

Applicable models

are

BAS-304A, 311A, 314A,

315A, 326A, 326LA, 341A,

For some of them,

separated

for

the

air

the

electrical description

and

solenoid specifications.

and

342A.

is

(ELECTRICAL

Warning

Never touch three large-sized capacitors on the power circuit

voltage residual charges stay

CHECK AND

for

a minimum

of

DIP

SWITCH)

1-2

minutes after the power is turned off.

Cautions

* During checking

* Check if the cooling

damaged due

with

dust, clean them

II1

Fuses

or

repair

work

when the power

fan

in

the

control box works correctly.

to

high temperature inside

at

regular intervals.

Fuse4

Fuse3 Fuse2

Fuse1

is

applied, take

the

control box. To prevent

-+-Bh

board

If

it

stops.

(see

the illustration below).

care

not

to

short -circuit terminals.

electronic parts and

the

air vents from being choked

The

devices

high-

may be

NOTE:

No.

1

2

3

4

NOTE:

When replactng

Part name

Fuse2A

(Glass tube

Fuse

(Glass tube

Fuse

(Glass

GfuseSAFB

(Quick melting

Prior

fuse,

SA

fuse,

15A

tube

fuse,

to

replacing fuse

the

fuses,

2A-125V)

SA·12SV)

15A-125V)

type,

SA-2SOV)

No.4.

be

sure

be

to

use

Part code

152566-000

152565-000

502887·000

508030-000

sure

to

check

the

specified

Fuji

Toyo

the

Measure terminals.

ones

Manufacturer

Tansi

FUJI

Tansi

FUJI

Tansi

FUJI Fuse

TOYOSA

TR

array

- If 20 -

works correctly.

-

If

0 Q or

pulse

listed below.

Company

2A

Company

SA

Company

15A

Company

assembly.

the

resistance

30

n:

Replace

co:

Replace

motor drive

Problem

The

work

clamp does

operate.

The power lamp does

on

and

no operation

The

feed plate

plate

The

machine

tum.

between

fuse

(by 1 oon

the

(PMD)

do

1. range)

TR

PCB,

and

not operate.

motor

The

TR

array

assembly

instead

the

array

of

not

occurs.

presser

does

not

EB

and e

assembly

and the

fuse

come

1.

-1-

rzl

Voltage measurement

1. Checkng

ru·m

between

2. Checkng

Turn

pins 1 and 2

3.

Checkng solenoids' voltages

the

on

control

power pins 1 and 2, 3

the

+

on

power

of

voltage

while

SV

source

while

connecting

connector P7.

connecting

and

4, and

the

connector

between

connector

5 and 6

P7

P8

to

the

of

connector P1.

to

the

control

(1) Turn

Remove

control

off

PCB,

the

P1

PCB,

Check on

the

Between Between

Between

then

Check

on

the

Between

power.

from

then

points of control

pins 1 and pins 3 and pins

measure

points

control

pins

J1,

and

measure

P8

PCB

2 4

5 and 6

the

of

P7

PCB

1 and 2

measure each solenoid's

resistance.

Resistance values are different according

sewing machine model.

Check

points Solenoid Value

Between Intermittent

pins1

and2

presser foot

Proslerfoot(Oftly

forsolennl

Between

pins3and4

Between

pins5and6

Between

pins7and8

)&(

tpedfb11oct)

Tension

release

Thread

trimmer

Thread

wiper

Resistance and voltage values

Resistance

Voltage

Resistance

Voltage

Resistance

Voltage

Resistance

Voftege

Resistance

Voltage

:;?'

~

the

voltages

Acceptable value

Approx.

65

11

25

Vdc

Vdc Vdc

voltage between

Acceptable value

Approx.

304A 326A 341A 311A

50

12V

50

10V

50

30V

60

30V

are

65

Vdc

to

the

342A

326LA

12n

~

_/"

20V

./'

~

./'

~

50

_/"

20V

~

100

sn

20V · 60V

110

20V

60

30V

approximate.

...

_.,.,.

P1

1

(2) lnsertP1

Insert

intoJ1,andturnonthe

the

measure the voltage.

•

As

for

the

foot

solenoids, measure

and

lowering

·As

for

tension thread measure

in

Since, very

briefly,

measure.

Each

voltage value is

·2-

power.

test

probe

from

the

lead

wire

side,

presser foot and intermittent presser

the

voltage

while

them.

release,

wiper

solenoids,

the

voltage upon finishing

this

case,

the

the value

as

in

thread

start

indicator

is

used as a

the

above

trimmer, sewing,

of

sewing.

only

oscillates

table.

and

raising

and

then

rough

4. Checkng

NOTE:

(J)

Presser

e

Presser

air

valve's

When

the

connect the

foot

(R) valve

foot

(L) valve

voltage

machine

air

valves.

G Intermittent presser valve

(only

for

BAS-341A

and

342A)

® Inner clamp valve

$ Option valve 1

8 Option valve 2

(/) Option valve 3

8 Needle cooler valve

~

+24V

®

+24V

is

for

solenoid specification

of

the

BAS-304A

1)

Turn

the

power

P8

from

J8,

then measure

valve.

Resistance

of

each valve (from (t)

should be approx. 3000.

2)

Connect connector

switch

Insert

lead

When

reading

3)

When

Measure

®. (Refer

Measure

and ® (

ON.

the

test probes

wire

side, then measure

Check

points

Between pins 1 Between pins 2 Between pins 3

the

(-}and (-)and (-}and

the

work

should be max. 24V I min. 0.1V.

optional valve

the

resistance between each valve and

to

step 1.)

the

resistance between

+)

when

step2.)

or

switch

P8

10 C 10 C 10 (

clamp

311A, there

OFF.

Disconnect connector

the

to

J8,

into

connector

the

+)

pedal is

Is

used:

resistance

to$,

then

turn

voltages.

Acceptable

treadled,

is

no

P8

0.1V-24V

each

each valve operates. (Refer

need

of

each

e

to~)

the

power

from the

value

each

valve

to

(-)

to

NOTE:

@to

8 are options.

-3-

Ill Control box

~0

JS

J4

~~

r---.,

lra:QJI

: 1

~Kmlr

'"---.J

J1

s1o

J2

0

J8

J6

fi~---~

_____

"----

J1

J2

J3

J4 X-drive pulse JS

J&

J7 J8

J9 Machine light connector (6V AC. 2A)

J 1 0 :

Solenoid connector

Synchronizer connector Connector for emergency stop, zero-point

sygnal

and

thread

Y-drive pulse

Foot switch connector

Programming device connector Air

valve connector

Marker

light

breakage

motor

connector

motor

connector

,

•.

detection

(SV

AC,

3A)

lool

J9

Ill

Explanation

If

the

machine

to

connector problems including improper connection

each connector number and pin contact

procedures.

The

table

connector and harness arrangement, refer

has

below

of

connectors

been disassembled

lists

the

connector numbers and symptoms resulting

or

adjusted during repair work, most

for

correct connection prior

to

•coNTROL

or

weak contact.

CIRCUIT

to

from

BLOCK

of

the

machine

It

is,

therefore,

proceeding

wrong

DIAGRAM•.

connections. For detailed

troubles

necessary

to

the troubleshooting

are

to

due

check

Connector No. and location

Main

PCB

I P8 I

I P3 I

PMDPCB

.MainPCB I

I

P6

I

I I

PS

Solenoid drive power

I

m [5[5

ElBg

I J11 I

Solenoid

~In~

~~

Air

PS

Y

nlsve.

pu

motor

valve

a

Drive signals and source

Control

Pulse

source

power

motor

source

drive

power

source

Symptoms resulting from wrong connection

• Abnormal motion

•

Nomotion

• Only Pan

•

Faulty presser

main

release components

• Step out

• Unusual noises motors

motor

operation

foot,

presser,

in

X and Y

operates

of

thread

axes

of

X-drive

the

presser

wiper

components,

trimming ,

andY-drive

plate,

thread

pulse

Motor

-[ L

I

;.

1:

I I I

I

ll

Main

PCB

·I

P13

I:

:I

I:

:~M+r:

1

PMD

Main

PCB

I P14 I

I I

Start/stop

I

the

LJ

:1

I

+SV

Needle stop position control,

synchronization control, and

rotation control signals

control currents

machine

~

P2

I

Synchronizer

r.

I

l

..

s-

for

• Abnormal rotation speed

• Stop operation failure

• The pulley

• The speed,

lamp

• The machine does

at

the

• The pulley rotates,

does

machine

then

stops. (The EMERGENCY

lights.)

upper position.

not

work

not

sews

.

rotate

at

not

stop with

but

the

of

the

pulley

abnormally

the

needle

feed mechanism

high

stop

Connector No. and

Main

PCB

[PO

f I

P1

panel

Main

em]

l J

PCB

1control

location

PCBJ

Drive

signals and

+SV

Speed control signal

Key and switch signals

Indicator control

source

sig~ls

from

does

wrong

not

come on.

Symptoms resulting

• The

•

Although

POWER

lamp

the

speed <ontrol dial is

the machine does riot change the

speed and keeps

•

Malfunction

it

at

2000

of

programming

spm.

connection

turned,

rotation

device

· I Programmer

MainPCB

IIP31

I

86

I

Floppy

Main

Qifl

~

r

I . . h I

Xh

ome

position Y

I

PCB

Main

QCJ

,,2

T T

P7

disk

PCB

1

PCB

ome

~

.J

II

I

..

positiOn

i

Read

and

write

from/to

X signals

EM

LED

Drive signal

Presser

floppy

andY

home

switch signal

signal

plate

signals

disks

position

lifting

signal

•

The

floppy

(Error No.4)

• The machine

• The emergency activated.

• The function

• The machine

lifts

foot

disk data

cannot

EMERGENCY

cannot

neither

the

presser

switch is depressed.

cannot

detect

home

stop

function

stop

lamp

be canceled.

starts

plate

If

the

be

read.

position.

cannot

lights

and

operation

corresponding

be

its

nor

liJ

Dip switch settings

NOTE:

®

No.

1

2

3

4

5

6 7

8

Be

sure

to

turn

off

the

power

before

Work clamp Rfght..,.lefttwo-stepwork clamp (When

Left~

When the

at

one timer and presser foot

Work clamp does Presser

(Inner damping Single pedal operation Activates thread breakage detector

does

not

rise when sewing

right two-step work clamp (When No.

switches

crank

2, 3 and 4 are on. left

not

rise

during

of

Inner clamping

device

Is

optional.)

possible

changing

When

will

descend

split

mode

device

turns

using

the st.rting pedal

(Thread

the

DIP

ON

com

plated

No.4

fs

ON)

41s

ON)

and

right work

With

two

operation.

to

the other

breakage detector

switch

settings.

ct::::J.

clamps

side

will

Is

optional.)

positions.

0

descend

Fer

the

BAS-304A

or

311A

with solenoid spedfication,

set®

No.2~

3#

and 4

to

OFF.

No.

1

2

3 Thread trimming

4

5

6

7

8

Single split 8000-stitch sewing mode

Needle cooler Thread breakage detection stitch margin setting

mode

Ad:ivates fiber thread breakage detector (optional part)

Triplet pedal operation

High

feed

speed

possible

does

not function when

can

be

used. (Needle cooler

possible

When ON

{Triplet

©

No. When

,

2

3

4

The first two stitches are

Thelalttwo The

with

Does

stitches are

upparshaftturns

the

needle

at

its highest position.

not

output

error

In

No.2 even

sewn

the

at

low

at

low

reverse

If

synchronizer

emergency

device

pedal

ON

speed

(approx.

speed

(approx.

direction afterttvead breakage, and the

stopswitd1

Is

optional.)

can

be

set

is

optional.}

260

Is

notconnocted

to

spm).

is

pressed.

either 8

or

14

-7-

stitches.

machine

stops

@

The

setting

*

If

the setting

of

the

is

DIP

switch@ in

not

correct

for

the

control box determines

the

machine head,

It

may

the

machine model.

cause

damage

to

a printed circuit board.

0-1

304A

311A

326A

326LA

341A

342A ON

OFF

ON

OFF

ON OFF

D-2

OFF

ON

OFF

D-3

OFF

ON

D-4

OFF

OFF OFF OFF

No.

1

2

3

4 5

6

7

8

9

No.2

0N

No.1,

3,4

OFF

Emergency

Trouble

Over-area

Floppy disk Floppy disk No program registered

Error occurred

Thread breakage detected

Protection network activated

stop switch

with

the motor

not

inserted,

is

locked (write protected)

in

program

No.1,20N No.3,40FF

(

ERROR

pressed

or

synchronizer I

or

mode

cable

because

NO.

LIST)

Cause

Motor

not

properly connected

of

abnormal voltage

stopped when voltage dropped

A

No

usable pattem data on

di'k

·