Juki SC-20, SC-120, SC-220, SC-320 User Manual

aJUKI

SC-20

SC-220

SC-120

SC-320

ENGINEER'S

MANUAL

SC-20

SC-320

No.

1-35-3

1990.7

PREFACE

The engineer's manual is written for the technical personnelwho are responsible for the service and maintenance of the

sewing machines. This manual presents detailed explanationofthe adjusting procedures, etc. which are not covered by

the INSTRUCTION It is advisable to use this engineer's manual is combination with the pertinent INSTRUCTION

MANUAL

intended for the maintenance personnel and operators at a garment factory.

MANUAL

and PARTS

LIST when servicing the sewing machinesofthese models.

1. Keep hands away from (he needle when the power switch is turned ON or while the machine it

operating.

OPERATION

Z Oo

not

put

while

(he

machineisoperating.

4.

During

operation,becareful

Other person's head or hands to come close to the

handwheel,Vbell,

not place anything close to them. Doing so may be

dangerous.

your

(irsgers

bobbin

PRECAUTIONS

into

the

thread

not to allow

winderormotor.

i 1_

take-up

your

cover

or any

Also, do

3. Be sure to

the

machine

S. If

your

guardorany

machine

turn

the

power

headorremoving

machineisprovided

other

with

protectors,donot

anyofthem

switch OFF

the V

with

removed.

belt

a belt

before

cover,

operate

tilling

finger

your

6. To achieve earth

sewing

security,besure

wire has

machine.

been

connected

that

the

before

power

ope'ating

supply

7. No

motor

the

not

operating.

OFFatthe

soundisheard

endofwork.

So. do

when

not

forgettoturn

the

sewing

machine

the

power

is

i

•'*

*•'

CONTENTS

1.

GENERAL

1-1.

Features • • • . 1

•

•••••;

•• ^

2. OPERATION 3

2-1.

Name

ofpart 3

2-2. Test run ^

2-3.

SC-20

Powerindicatorbox ^

2-4.

2-5.

SC-120

SC-220

Control

panel

2-6. SC-320 Control panel 12

3.

ADJUSTMENT

3-1.

Belt

tension

21

3-2. Prevention motor vibration (for Ncompany'smotor) 21

3-3. Checkingand correcting the rotational direction of sewingmachine 21

3-4.

Pedal

3-5. Maximum sewing speed 25

3-6.

Auto-lifter

3-7. Howto

reduce

the handlightfrom

flickering

(for

single

phaseonly) 28

22

27

^

®

4.

FUNCTIONS

4-1. Power supply voltage 29

4-2.

Functions

selection

switches

4-3. Increaseofcontrol panel functions 44

44.

Safety circuit 46

4-5. Connectors for standing work 48

4-6. Production control systemand needle-upstop switch functions 50

5.

MAINTENANCE

AND

INSPECTION

5-1. How to replacethe sensorpotentiometer set 51

5-2.

Memory

5-3.

Motor

54.

Solenoid

5-5. Howtoreplace each circuit board 55

5-6. Troubleshooting 64

5-7. Circuit board installment diagrams 75 5-8. Connector connection diagrams 80

battery

malfunction

monitor

charging

detector

LED

monitor LED

LED

(SC-320

only) 53

5-9. Typeofrating plates for SC seriesofthe PSC unit 81

5-10. Block diagrams 82

29

30

51

53

54

1.

GENERAL

1-1.

Features

1)

Use

ofanACservomotor

(1) No noise or vibration while the machine is at rest.

(2)

The

power

consumptionis40%to60%

(3)

The

motor

weight

(4)

The

absence

(H

company's

Unlike the DC servomotor, there is no bmsh.

2) Pedal operation features

(1) Youcansetthe

stepswith fingertipcontrol according to the type of

operation and your levelofproficiency.

(In the conventional unit, themotor pulleyhad to

be changed to alter the maximum

Further, you canget the samespeedat any time.

ofa

provides

has

been

clutch

(no

brakeisgood

maximum

the

following

almost

halved,

brakeincase

for

more

sewing

speed

sewing

mqor

compared

permitting

ofN

than10

in400

speed.)

advantages:

with

easier

company's

years

under

s.p.m.

the

conventional

layout

motor)

normal

power

change.

makes

theunit

operation.)

consumption.

virtually

maintenance-fiee.

High-speed'

play

stroke

(2) The

(3) The

(4) The minimumspeedfor depressing the front part of

3)

Reverse

(1)Asin

(2)

(3)

conventional

So, by combining the knob with the function

mentioned in(1)

be provided. This eliminatesthe need for large pedalingforce to maintain high speed,significantly

reducing operator foot fatigue.

speed

about 1mm (0.039") by pedal stroke to suit with

each operator.

the pedal can be changed (from 200 s.p.m.to 400

s.p.m.).

feedstitchingfeatures

the

conventional

starting

a preset speed.

The

Furthermore, the

The

stitching speed is changed.

reverse

speed

above,

acceleration

feed

stitching

speed

control

circuitry

limit

high-speed

starting

model,

stitching

speed

canbe

knobis

pointcanbe

you

orthe

has

adjusted

has

been

also

provided.

playstrokecan

can

select

modeinwhich

been

increased

from

improvedtoprevent

adjusted

either

1,000

the

modeinwhich

the

machine

from

1,700

s.p.m.

to 3,500

overrunor1-stitch

Pedal

(3)

1mm

adjustable

pedal

Pedal

priorityisgiventopedaling

performs

nonstop

s.p.m.to1,900

s.p.m.,

using

depression

(0.039

by

stroke

depression

s.p.m.

the

error

when

amount

'l

^

>

/

/ (4) 400 spm

_t

200

amount

reverse

feed

(about

variable

the

reverse

spm

for

stitching

12%

increase).

resistor.

the

at

feed

4) The softstart speedhasbeen

The

soft

start

speed

for

to 800 s.p.m.

The

soft

start

speedisnow

the speedmore than necessary.

increased.

assuring

adjustable

properly

interlaced

withinarangeof200

threads

- 1 -

ofa

starting

stitch

s.p.m.to2,000

has

been

s.p.m.,soyoudonot

increased

from

200

s.p.m.

havetodrop

5)

Enhanced

Thecontroller

simplybyreplacing

6) A manualcount-downcapabilityhas been added.

Asanadditional

switchtoprovide

series

comes

with

easy

inthe

their

capability,

the

control

upgrading

SC-20,

control

the

based

panels

manual

SC-120,

(excluding

count-down

ofa

preset

SC-220,

numberofstitches.

SC-320

the

SC-522).

capability

and

SC-522

has

been

series,

andyoucan

addedtothe

easily

one-touch

• '•^ ^ ^

upgrade

?; > ..

type

reverse

them

feed

When the one-touch type reverse feed switch

Count

back

Count

back+Thread

7)

Even

ifa

material

(After

thread

highestposition.)

8) Aconnectorfor standing workhasbeen

9) A

10)

terminal

The

circuit

for connection to a

automatic

board.

trim

overlapatsewing

trimming,

presser

ispressed,the preset number of stitches is

counted

When the one-touch type reverse feed switch

ispressed,the preset numberofstitches is

counted

startorendis

youcanturnthe

sewing

foot

lifting

capability

down.

down,

handwheel

provided

control

Description

and

threads

thick,

inthe

asa standarditem.

system

canbeadded

are

trimmed.

the

needle

reverse

hasbeen

provided.

simplybyadding

Sewing pleats

Replaces the reverse feed

stitching at a seam end. (This feature is especially useful

in a sewing machine for standing

work

because

operating

switchiseliminated.)

will

notbe

caught

directiontobring

theAKauto-lifter

Applications

the

need

the

thread trimmer

inthe

the

needle

for

thick

overlap.

barup to its

andatransistor

11)

The

control

12)Toensure

13)

You

(Forasewing

14)

The

output

should occur, the minimum function isassured.

(Example

reversefeed stitching.)

15)

The

input

16) Reliability

The

17)Weare

Sewing

panelisvery

easier

operationofthe

can

setthe

lifting

machine

transistor

: If

the

trouble

machine

checking

system.

This

uses

planningtoprovide

controlcounter(oflowcost)

easytooperate

duration

for

has

thread

trimmer

feature

enables

only

the

standing

been

youtoquickly

components

the

control

ofthe

work,itis

designedtobeaunit

transistor

for

the

following

and

panel,

Auto-lifter

fails,

output

and

which

options

the

slant

panel

each

key

after

thread

advisabletoset

circuit

the

wiper

system

(output

easily

identify

have

passed

inthe

future:

surface

has

makesiteasiertosee

been

assignedtoonly

trimming

the

lifting

boardtomake

transistor

monitor

defective

our

reliability

for60

sec.

duration

ita

common

will

worktopermit

LED)

has

parts.

test

conductedoneach

one

or ten

for

been

addedtothe

indicationonthe

function.

minutes.

ten

minutes.)

part.Ifany

thread

panel.

trouble

trimming

and

conventional

discrete

component.

18)

The

machine

controller

now

canbeappliedtothe

controlofthe

- 2 -

ED-1

(cloth

edge

sensor)

(Optional).

2.

OPERATION

2-1. Nameofpart

O Power switch

o Control

box

0 Synchronizer O

L-shaped

0

PSCbox

0 Max.speedcontrol knob

0 Motor

threadstand

m

0 Pedal

0 One-touch type

0

Wiper

0 Stand

0 400 s.p.m.-step speed control knob

0 Connector for standing operation

0 Connector for production control system

levelling

reverse

feedswitch

screw(or caster)

- 3

O Power switch

Power switch for

the

motor,

PSC and

control

box.

0 Control

Usedtomake

sewing conditions.

® Synchronizer

box

settings

Incorporatedinthe

speed,

then

sendsaresultant

L-shaped

O

0 PSC box

thread

stand

Comprisesacircuitrytocontrol

trimming

actuate

0

Max. Allows

0 Motor

Operates

(AnH

solenoid,

the

elements.

speed

controlknob

analog

the

company's

adjustment

machineathigh

for

machine

reverse

motoris

automatic

pulley,

input

the

feed

solenoid,

of the

maximum

speed

provided

reverse

the

synchronizer

signal

to the

sewing

etc.),apedal

medium

witha

feed

stitching,

main

machine

sewing

speed

brake.)

the

number

detects

circuit

and

the

board

motor,anoutput

sensortodetect

without

low

speedinresponse

ofstitches for pattern

needle

position

inthe

PSC

box.

circuitrytooperate

pedal

position,

changing

themotor

toa

(upordown)

. .

andapower

pulley.

signal

received

sewing

and

the

from

orother

the

se^ymg

elements

circuitry

the

PSC

(thread

to

box.

0 Pedal

The

front

and

back

parts

ofthe

pedal

are

depressedtocontrol

presser

©

One-touch

#

0 Stand

0 400 s.p.m.-step speedcontrol knob

This

0 Connector for standing operation

0 Connectorfor production control system

footlifter

Usedby hand to perform

Wiper

Wipes

the

needle

PSC

box.

levelling

Usedtoperform

switch

Used

fora

Usedto connect the machineto aproduction control system.

(only

type

reverse

thread

screw

adjustment

has16steps

sewing

machine

fora

version

feed

switch

reverse

off

the

(or caster)

sothatthe

from

1to 16in

designed

with

AK-31,

feed stitching.

material

after

stand

ordertodigitally

for standing operation.

AK-34),

thread

rests

etc.

trimminginresponse

flatly

onthe

setthe

the

sewing

speed

toa

floortominimize

maximum

speed

andtoactuate

wiper

signal

vibration

in400

s.p.m.

the

thread

received

during

steps.

trimmer,

from

the

operation.

- 4 -

2-2.

Test

Run

1) Operation when the power switchisturned ON

When

the

power

switchisturned

needle reaches If

the needle is already in its upper stop position when the power switch is turned ON, the sewingmachine stays

stationary.

the

upper stop position, and then stops with its needle in that position.

ON,

if the

2)Pedal operation

(1) The pedalis operatesin the

©

foUowing

—

High

Low

Stop

Thread

needle

isnot inits upperstop

four steps, (except for a

speed

trimming

Version

position,

with

AK-31,

the

machine

AK-34)

High

Low

Stop

rotates

speed

(neutral)

^

untilits €?

'-Uf

Thread

The

sewing

machineruns at low speedwhen you depress the front part of the pedal.

The

sewing

speed

changes

(However,if the automatic

until it completes When

the pedalisreturnedto the neutral position(stop position),the

When

the backpart of the pedalis depressed, the thread trimmeris actuated and the needlegoesup and

stops in its upper position.

(When

the wiperswitchhas beenset to ON,the wiperis actuated.)

reverse

fromlow to highwhenthe front part of the pedal isfurther

reverse

feed stitching switch has been set, the machine will not mn at high speed

feedstitching.)

machine

will

depressed.

stop with

trimming

needle

down.

7^

- 5 -

(2) In caseof a versionwith AK-31,AK-34

The pedal isoperated in the

following

High

Low

Stop

Presser

Thread

speed

trimming

fivesteps:

foot

lifting

@

High

Low

Stop

Presser

speed

(neutral)

foot

lifting

2-3.

Thread

o The

sewing

o The

(However,

highuntil

o

When

o

When

o

When

machine

sewing

speed

if the

reverse

the pedalis returned to the neutral(stop) position,the

the back part of the

the backpart of the pedalisfurther depressed, the presser foot comesdown,thread trimmeris

startsat low

changes

automatic

speed

whenthe front part of the pedalislightly

from

lowto highwhenthe front part of the pedalisfurther

reverse

feed

stitching

feed stitching iscompleted.)

pedal

islightly

switch

depressed,

the

has

been

presser

set,the

machine

foot

depressed,

depressed.

sewing

speed

will

stopswith its needledown,

will

goup.

actuated, and the machine stops with its needleup.

(If the wiper switchhas beenset to ON, the wiperis actuated.)

o

Between

the low and high

sewing

speedpositions, the

machine

runsat a speedcorresponding to the pedal

depressionamount. (The speed isinfinitely variable.)

o The proper thread trimmingaction will not be disturbed even if the pedal is returned to the neutral

position immediatelyafter the machinestarts thread trimming.

At this time, the thread trimmerproperlyoperates

the safetycircuitryisput in operationso that the

even

if the front part of the pedalisdepressed,

machine

will

not mn afterthread

trimming

Therefore, the pedal must be returned to the neutral position once.

SC-20

Power

Indicator

Box

trimming

not

change

however,

iscompleted.

to

1) Power indicator LED o Lights up when the power switch is turned ON.

o Thislight stays ON for a while after the power isturned OFF. It is dangerousto carry out maintenance or

adjustment with the PSC box cover open. Be sure that the LED is OFF before starting maintenance such as

part replacement.

SC-

- 6 -

2 0

2-4. SC 120 Control panel

1) Controlpanel

Automatic

reverse stitching (for end) indicator

lamp (LED)

• Lights

switchisON.

when

the

ending

Power indicator lamp (LED)

•

Lights

up when the power switchis turned ON.

•

Stays

ON

forawhile

power

switchisturned

It is

dangeroustoperform

work

with

the

PSC

box

Be

sure

that

the

lampisOFF

forming

replacement.

maintenance

reverse

immediately

OFF.

any

cover

open.

work

such

stitching

after

the

maintenance

before

per

as

parts

m m

Automatic

reverse stitching (for start) indicator

lamp (LED)

• Lights

switchisON.

Switches

•

These

numbersofstitches

The

Automatic

•

Used

stitchingatsewing

•

Each

turns

invalid

has

when

for

setting

are

pushbutton

setting

[+]...

.Increases

B . . . .Decreases

reverse stitching (for start) switch

to

turn

time

ONorOFF.

when

been

setto"0".)

the

starting

the

numberofstitches

reverse

switches for

for

rangeisfrom0to

ON

this

switchispressed,italternately

the

stepsAand

9.

the

numberofstitches

the

numberofstitches

or

OFF

start.

numberofstitches

automatic

(This

switchisrendered

stitching

setting

B.

reverse

for

step

the

B

Switch

for

raising

the

needle.

•Ifthis

• By depressing

stops

and

thread

(Note

needle

stopsinits

switchisturned

with

its

needle

upper

the

trimmer

that

has

maybeactuated.

this

switch

been

moved

down,

position.

back

2) Howto use the automatic

Automatic

switching

switchO

Stitching

Automatic

stitching

switch 0

reverse

(for

pattern

reverse

(for

start)

end)

OFF

ON

when

the

needle

partofthe

willbeinvalid

downbyhand.)

reverse

ON

OFF

machine

goes

up

pedal,

the

when

the

stitchingpatterns

OFF

N

ON

N

ON

Automatic

•

Used

stitchingatsewing

•

Each

turns

invalid

has

By combining ON and

stitching (for start) switch O and automatic

reverse stitching (for end) switch

to

turn

ON

or

OFF

automatic

end.

time

this

ONorOFF.

when

been

switchispressed,italternately

(This

switchisrendered

the

setto"0".)

OFF

numberofstitches

conditions of automatic reverse

reverse

for

step

stitching

B

m

El

m

(for end) switch O , four different stitching patterns are

available.

- 7 -

2-5.

SC-220

1) Control panel

Control

panel

Automatic reverse stitching (for end) indicator

lamp (LED)

• Lights when

• When pattern 4 has been selected, this lamp does not

the

ending reverse stitching switch is ON.

light. ^

Automatic

reverse stitching (for start) indicator

lamp (LED)

• Lights when

• When

light.

the

pattern

starting reverse stitching switch is ON.

4 has been selected, this lamp does not

Power indicator lamp (LED)

• Lights when

• Stays ON for a while immediately

switchisturned

It is dangeroustoperform any maintenance work with

the

PSC

Be sure

maintenance

box

that

the

cover

work

power

OFF.

the

switch is

open.

lamp is

suchasparts

turned

ON.

after

OFF

before performing

replacement.

the

power

Automatic thread trimming indicator lamp (LED)

• Lights

• Ughts whenever pattern 4 has been selected.

• When

ON.

light.

when

the

automatic

pattern

1 has been selected, this lamp does

thread

trimming

switch

Pattern indicator lamps (LEDs)

been

• When a

corresponding

Switches

pattern

for

lamp

setting

(1 to 4) has

lights.

the

numberofstitches

• These are pushbutton switches for setting

of

stitches for steps A to D. The setting range is from 0

to

9.

(When pattern 2 or 3 has been selected, the number

stitches

canbeset

^

0

for0to99forCandDtogether.)

Increases

Decreases

the numberof stitches

the

number

selected,

of stitches

the

numbers

is

not

the

of

Automatic reverse stitching (for start) switch

•

UsedtoturnONor sewing

start.

• Each time this switch is pressed, it alternately

or OFF. (This switch is valid for patterns 1, 2

For patterns 1 and 2, the switch is invalid for step B. For pattern 3, it is invalid when the rotary switch

"SW1.

SNUMA—D"

"0".)

Automatic

•

UsedtoturnONor

sewing

• Each

or The

in

"SWI.

"0")

reverse stitching (for end) switch

end.

time

this

OFF.

(This switch is valid for

switch is invalid for step C in

pattern

2. It is also invalid when

SNUMA~D"

OFF

automatic

in

the

OFF

automatic

switch is pressed, it alternately

in

the

PSC

reverse

box

reverse

patterns

pattern

the

box

has

1 and step B

rotary switch

has

stitching

turns

and

been

stitching

turns

1, 2 and 3.

been

set

ON

B B B B

m

AB

AS

ICPj

Pattern

• Used to select

at

3.

to

at

Switch

• If

• By depressing the back partofthe pedal, the thread

Automatic

•

to

• For patterns 2 and 3, this switch turns ON or

selector

panel.

for

this

switchisturnedONwhen

its

needle

upper

positions.

trimmer

(Note

that

has

been

This

is a

automatically

switches

oneofthe

raising

the

down,

the

maybeactuated.

this

switch

moved

downbyhand.)

thread

trimming

selector

trim

threads

sewing step even with

depressed.

alternately

each

time

four

needle

goes up

will be invalid

switch

to

upon

the

front part

it is pressed.

patterns

displayedonthe

the

machine

and

when

cause

the

completionofthe

of

stops

the

machine

the pedal

with

in its

needle

to

last

OFF

• For pattern 4, the indicator is always ON regardless of

the switch

ON/OFF

condition.

- 8 -

2)

How

to use

each

stitching pattern

fim

H.

•

:>

•

i>

i»1

f

%

I."

AB AB

IcdI

A/Ci

B

ID

CO

A. -B • C D

• Q Q E)

HS

(B

ii

(9 (9

GO

1. Pattern $>

Automatic

stitching

switch 0

Stitching

Automatic

stitch

switch

(for

0

reverse

(for

pattern

reverse

end)

start)

OFF

0 0

ON

OFF

>€•

OFF

n

ON

•JUKI

e e

1. Turn pattern selector O ON.

2. By combining ON and OFF settings of automatic

reverse

stitching (for start) switch 0 and automatic reverse

stitching (for end)

patterns

are available.

3. For the starting automatic

switch

0 , four different stitching

reverse

stitching, set the

numberofstitches using A and Bofswitch O . For the

ending automatic

reverse

stitching, set the number of

stitches using C and Dofswitch O .

(Precaution) Be sure that, when you selecta pattern selector

switch,

lamp

lights

the

corresponding

up.

pattern

Indicator

2. Pattern :|>

Automatic

stitching

switch 0

Stitching

Automatic

stitch

switch

(for

0

reverse

(for

pattern

reverse

end)

start)

OFF

CD

ON

OFF

CD

OFF

ON

1. Turn pattern selector switch 0 ON.

2. By combining ON and

conditions

of

automatic

OFF

reverse stitching (for start) switch 0 and automatic

reverse stitching (for end) switch 0 , four different stitching patterns are available.

3. For bofo starting and

ending

automatic

reverse

stitchings,

set the numbersofstitches using A and B of switch O .

4. The

numbers

of stitches for theintermediate stepscanbe

set within the range of 0 to 99, using C and D of switch

O .

5. When automatic thread trimming switch 0 has been

tumed ON, the thread trimmer

will

automatically be

actuated upon completion of steps CandD or the ending

reverse stitching.

6.

When

automatic thread trimming switch 0 has been

tumedOFF, the

machine

stopswithits

needle

down

upon

completion of steps C andD. At thistime,if you operate

the one-touch type reverse feed switch, the machine mns

at low

speed

(for

compensative

return the pedal to itsneutral positionbefore you

the front part of the

operation regardlessofthe preset numberofstitches.

pedal

stitching). Further, if you

again,

you can

resume

depress

sewing

- 9 -

3. Pattern :|>

Automatic

(for start) switch ©

Automatic

(for end) switch 0

Stitching

reverse

pattern

reverse

stitching

stitch

AB

OFF

*

CD

AB

CD

OFF

1. Turn pattern selector switch © ON.

2. By combining ON and OFF conditions of automatic

reverse

stitching (for start) switch © and automatic stitching (for end) switch 0 , four different

stitching patterns are available.

3. Set the numbersofstitches for steps AB and CD within

the

range

of 0 to 99, usingA to D of switch 0 .

4. Set numbersofstitches N for the starting and ending

automatic reverse stitching steps. (See the setting method

described below.)

5. Upon completion of each step, the machine stops with its needle down even when you depress the front part of the pedal. .At this time, if you operate the one-touch type reverse feed switch, the machine will perform

compensative stitching.

6. If you depress the back part of tlie pedal during

intermediate AB or CD steps, the machine will immediately trim the threads. If you depress the back

part of the pedal during the last CD step, the machine will

trim the threads either immediately or upon completion

of the ending automatic reversestitching.

ly

I/n

ON

OFF

Yn

CD

AB

CD

OFF

AB^

7. When automatic thread trimming switch 0 has been

turned ON, if you depress the front partofthe pedal after

completion of the last step, the machine will

threads either immediately or upon completion

ending automatic reverse stitching.

8.

When

automatic thread trimming switch © has been

turned OFF, the machine will stop with its needle down upon completion stops, the pedal is in its neutral position. If you depress the front part operation. At this time, if you return the pedal to its

neutral position before you depress the back part of the

pedal, the machine will trim the threads either immediately or upon completion

(Note) For a machine equipped with an Auto-lifter, the

Auto-lifterisactuated

its

needle

the

machine

compensative

CD

l/N

AB

CD

ON

of

the last step. When the machine

of

the pedal, you can continue sewing

when

down

upon

completionofa

stops

stitching

with

operation.

AB

of

reverse stitching.

the

machine

its

needle

ON

CD

AB

CD

ON

trim

of

stops

steporwhen

down

the

with

in

★

4.

How

to set numberof stitches Nfor startingand

SNUMA~D

TP6

S.GND

BT

SUB

•nCZl'^

JMAX

PNEUF

M400I

Pattern

301

ending

automatic

reverse

stitching steps

1. Turn the power switch OFF.

2. Open the PSC box cover.

3.

Using

a flat-bit screwdriver, set the arrow on rotary switch

(SWl) O on the main circuit boardtothe desired

numberofstitches.

4.

Close

the

PSC

box

5. Turn the power switch ON

cover.

again.

This completes the

settingofnumberofstitches N.

(Note) Both starting and ending automatic

steps

will

have

the

same

numberofstitches.

1.

Turn

pattern selector switch O ON.

(At this

time,

the

automatic

thread

reverse

trimming

stitching

indicator

lamp lights up.)

2. Set the numbers of stitchesfor steps A to D,

of

switch

0 .

using

A to D

3. By depressing the front part of the pedal once, you can

make the machine perform a

series

of operations from

sewingsteps A to D to trimming the threads.

-

10

-

^

Howtoincrease

the numberof stepsfor Pattern

$>

(upto 9 steps)

O

'^BSHPT

sc.

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For the nonnal sewing specification, the number of steps is

four (A, B, C and D) at the maximum. The number of steps

can be increased as many as nine, however, by changing the

settingofthe relevant DIP switch on the main circuit board

in

the

PSC

1.

Tum

box.

OFF the power switch.

2. Open the coverofthe PSC box.

•:

tr

K

d

a

E

3. Set DIP switch (SW44BSRPT) O on the main circuit

boardtoits ON position.

4.

Close

the

5.

Tum

the

coverofthe

ON the power switch. This completes the setting

DIP

switch.

PSC

box.

of

Now the sewing specification is as illustrated in the figure.

Set the numberofstitches for steps A to C, using A to C

switch

of

O . Dof

all the steps.

switch

O is

usedtospecify^enumber

of

(Example)

/A-»-B->-C^B=>The

A^B^C^B^C

numberofall

=>

the

steps

D=4 \

\ The number of allthe steps D = 5 /

(Precaution) If D is set to

"0",

all the numbers of stitches

specified for A through C will cometonothing

regardlessofthe

set

values

for

them.

11

-

2-6. SC-320 Control panel

1) Control panel

o o

+ -I- +

O Power indicator lamp (LED)

• Lights up when the power switch is turned ON.

• Stays ON for a while immediately after the power

switchisturned

Reverse

• Used to select a reverse stitching

OFF.

stitching

pattern

switch

pattern.

• When this switch is turned ON, lamp 0 comes ON,

while overlapping stitch indicator lamp 0 goes OFF.

Also, all indicator lamps associated to programmed stitching will go

0

Reverse

OFF.

stitehing pattern indicator lamp

(LED)

• Lights up when the reverse stitching pattern switch is

turned

(DN.

O Overlapping stitch

to

• Used

select an overlapping stitch pattern. When

pattern

selector switch

this switch is turned ON, lamp 0 lights up, while

reverse

stitching indicator lamp 0 goesOFF. Also,

ail indicator lamps associated to programmed stitching

will go

OFF.

0 Overlapping stitch indicator lamp (LED)

•

Lightsupwhen

is

turned

ON.

the

overlapping

stitch pattern

switch

0 Programmed stitching pattern ^ switch

• Used to select the

programmed

stitching

pattern

1.

• When this switch is turned ON, lamp 0 lights up.

O Programmed stitching pattern

(LED)

$>

indicator lamp

• Lights up when the programmed stitching pattern 1

switchisturned

ON.

0 Programmed stitching pattern ^ switch

• Used to select the programmed stitching pattern 2.

• When this switch is

turned

ON, lamp 0 lights up.

0 Programmed stitching

pattern

^ indicator lamp (LED)

' Lights up when the programmed stitching pattern 2

switchisturned

)

Switches

Used to set the numberofstitches within the range

0 to 9 for steps A to D.

"+":Increases

" :

Decreases

0

Stitch

number

ON.

for

setting

the

displays (LED)

the

numberofstitches

numberofstitches.

of

• Indicates the numberofstitches for each step (A to D).

0

Automatic

• Used to

sewing

reverse stitching

turn

ON or

start.

OFF

(for

automatic

start)

reverse

switch

stitching

• Each time this switch is pressed, it alternately turns

ONor OFF.

automatic reverse stitching at sewing start

(When

step Bhas been set to "0", the

cannot

be

set.)

0 AutcMnatic reverse stitching (for

(LED)

• Lights up when the automatic

start)

reverse

indicator lamp

stitching (for

start) switch is turned ON.

0

Automatic

• Used to sewing end.

reverse stitching (for end) switch

turn

ON or

OFF

automatic

reverse stitching at

• Each time this switch is pressed, it alternately turns

ON or OFF.

(When

step C has been set to "0", the

automatic reverse stitching for sewing end cannot be

set.)

0 Automatic reverse stitehing (for end) indicator lamp

(LED)

• Lights up when the automatic reverse stitching (for

end)

switch is

turned

ON.

at

(E>

Stepsetting

switch

• Usedtomake a step change in order to set the number

of

stitches, needle

ON/OFF,

thread trimming or

stop

position, presser

other

sewing conditions

foot

lifter

for each step in programnied stitching. .

• The step can be changed from 1 to 15. (If

there are steps for which the numbersofstitches

have

not

been set, only the stepofthe lowest number

will be displayed.)

•

"+"

: Increases

" : Decreases

I

Step

display (LED)

the

step

No.

Displays a step (1 to 15).

I

Step

stitch

number

Used to set the

of

0 to 99 for each sewing step.

"+"

:

Increases

" :

Decreases

When

the

depressed,

or

decrease.

I

Step

"+"

the

numberofstitches continues to increase

stitch

number

setting

switch

numberofstitches within

the

numberofstitches.

the

numberofstitches.

or

side

of

the

switch

display (LED)

the

is

range

held

Displays the numberofstitches for a step within the

range

of 0 to 99.

I Machine

stop

mode

selector

switches

Used to select the following machine stop modes at

the time when a step has been sewn: o The machine will stop with the needle up. o The machine will stop with the needle down,

o The machine will stop with the presser foot up.

o The machine will stop with the presser foot down,

o The machine will stop after thread trimming.

Indicator lamps (LED) for showing

stop

modes:

The

machine will

The machine will stop with

stop

with

the

selected machine

needle up.

needle down.

The machine will stQpwith the presser foot up.

The machine will stop with the presser foot down. The machine will stop after thread trimming.

Step

insertion

switch

Usedtoinsert a new sewing step in preset sewing steps.

Step

deletion

switch

Used to delete a particular one from the preset'sewing

steps.

®

Restart

switch

• Used to restart sewing a programmed stitch step after

an empty bobbin has been replaced.

Switch

for

raising

the

needle

If the machine has stopped with its needle down, the needle goes up and stops in its highest position when

this

switchisturned

' Memory

battery

ON.

exhaustion

monitor

lamp (LED)

This lamp may light up if the machine has been unused

of

for an extended period

been

exhausted.

time and the battery has

2) Howto useeach stitdimg pattern

(1) Reversestitching pattern

0 O O O 0 0 O

^

Hi

w

^ ^ ^

•JUKI

ac-3eo

Y Y V

0

1. Pressreversestitching pattern switch O •

2. Reverse stitching pattern indicator lamp 0 lights up,

and stitch number displays (LEDs) 0 for steps A to D

indicate the preset numbersofstitches. Also, automatic

reverse

automatic

show

stitching (for start) switch 0 and automatic reverse

stitching (for end) switch 0 .

stitching (for start) indicator lamp O and

the

reverse

ON

stitching (for end) indicator lamp 0

and

OFF

conditions

of

automatic

reverse

-

Automatic

stitching

switch O

Stitching

Automatic

stitching

switch O

3. To change the numbers

reverse

(for

patterns

reverse

(for

end)

start)

OFF

ON

OFF

of

stitches, press the

OFF

ON

" sides of switches 0 for setting the numbers of

stitches located under stitch number displays 0 for

steps

A to D.

4. By combining ON and OFF settingsofautomatic reverse

stitching (for start) switch 0 and automatic reverse stitching (for end) switch 0 , four different stitching

patterns

13

are

available.

ON

"+"

or

(2) Oveilapping stitch pattern

9«

•JUKI

8C-3eO

★

Howtoincrease

the

number

1. Pressoverlappingstitching pattern switch O .

2.

O

GO

Overlapping and stitch

numbersofstitches.

3. To stitches located under stitch number

steps AtoD.

5

1

5

El

4. By cause

thentoactuate

(Precaution)

f T Y

of stepsfor Pattern (upto 9

stitch pattern indicator

number

change

"

depressing

the numbers of stitches,

sidesofswitches

the front part of the pedal once, you can

the

machine

its

The

for

separately

reverse

steps)

lamp

O

lights

up,

displays

O for setting the

press

the "+" or

numbers

displays

preset

of

to sew steps A to D in sequence and

thread

trimmer.

numbersofstitches

steps A to D are stored In memory

from

the

stitching

pattern.

which have

numbersofstitches

been

set

for

a

^3)

Programmed

sc.

EC

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For the normal sewing specification, the number of steps is

four (A, B, C and D) at the maximum. The number

of

steps

can be increased as many as nine, however, by changing the

of

setting

in

the

the relevant DIP switch on the main circuit board

PSC

box.

1. Turn OFF the power switch.

2. Open the coverofthe PSC box.

3. Set DIP switch (SW44BSRPT)

O

on

the

main

circuit

boardtoits ON position.

4.

Close

the

coverofthe

a

5. Turn ON the power switch. This completes the setting of

the

DIP

switch.

PSC

box.

Now the sewing specification is as illustrated in the figure.

Set the number of stitches for steps A to C, usingA to C of

switch

of

O . Dof

all the steps.

switch

O is

usedtospecify&enumber

(Example) A-^-B-^-C^B

A^B-J-C-^B-^C

The number of all the steps D = 4

=>

The numberofall the steps D = 5

(Precaution) if D is

setto"0",

specified regardlessofthe

forAthrough

set

all

the

numbersofstitches

C will

values

for

cometonothing them.

SjTi.

© ©

I

X

O

n

•JUKI

SC-38a

Y Y Y

1.

Checkingchanging

pattern

5>

1. Pressprogrammedstitching pattern 1 switch O .

2.

Automatic

reverse

stitching (for start) indicator

and automatic reverse stitching (for end) indicator lamp

©

light

A to D show

up, and stitch number

S] S]SIm .

3. Step display © shows i

display © shows12I01.

the

programmed

displays

111

, and step stitch number

O for steps

stitching

lamp

r+)

©

o 0

© ©

4. The needle-down stop lamp and the presser-foot-up stop

lamp of indicator lamps © (for showing the selected

machine stop modes at the time when a step has been

completed) light up.

5. If any of stitch number

reverse stitching pattern indicates a number of stitches

other than 4, then you can change it to 4 by pressing

the "+" or side of the corresponding switch © for

-

setting the number of stitches.

14

-

© ©

displays

[-1

o

(A to D) O for the

The

is

"+"

pressed

side of

onceata

•

ir

switch

time

f

Indication

display 0

on

•

Indication

display 0

Dn

i-

/ n

I u

on

u

Indicator lamps o

The

following

lamps

°-l-

%

light up

4M

Pattern

10

Step

—O

4

Zi

u

I

C

6. Each time the "+" side of step setting switch 0

pressed, the indications will change as illustrated above.

7. If the

numberofstitches

display

above,

switch

0 is different

change

0 for

it by

setting

shown

from

pressing

the

numberofstitches

on step stitch

those

the "+" or side of

given

in the table

fora step.

8. If a machine stop mode is different from those the table above, set it using switches 0 for selecting

jn

(_

I u

number

given

I n

u

n

u

IS

9. With these settings, you can sew the pattern illustrated

° 1

Step

20

1

10

Step

at left by repeating the seriesof operations

the front part of the pedal Automatic stop based on the

preset number of stitches Setting the pedal to its neutral position Depressingthe front part of the pedal.

At this time, the step display indicates the step No. being

in

sewn, while the stitch number display and the machine

stop

mode indicator lamps stay OFF.

the machine stop modes.

*

Selectingamachine

stop

mode

You can make the machine stop with its needle up after trimming the threads, or stop with its needle down or up without

trimming the threads, or stop with its presser foot up or down.

Howtoset

Example 1 :

the

desired machine

Setting

its

for

needle

making

down

and

stop

the

presser

mode

machine

foot

stop

up

with

Example

2 :

Setting

its

presser

for

making

footupafter

the

machine

thread

20

Step

2

Depressing

stop

with

trimming

3

°J_

^-5-

P

>€

How to release

%

>§

Press

the

switches

1—I.

corresponding indicator lamps to

light up.

the

thread trimming switch The following two methods are available:

(T)

Press

This will place the needle-down and the corresponding indi

cator

indicator lamp for machine stop

goes

This

will

switch

lamp will light up. (The

after thread trimming

OFF.)

L^J

the

machine in

stop

cause

and

the

again.

mode,

• ^

° 1

-5-

-5_

>§

ff"

Press

the

switches

i

—i

.

corresponding indicator lamps to

light up.

This

j>g| and

will

cause

the

In this case, the needle-up stop

lamp and the needle-down stop

lamp

stay

OFF.

Q)

Press

the

switch;-J-;

the switch j . This will

cause the corresponding indi

cator lamps to light up. (The indicator lamp for machine

stop

after thread trimming

OFF.)

goes

or

>§

-

15

-

Adding

The

following

Illustrated

steps to the programmedstitching pattern 1

procedure

below:

shows

howtoadd

two

steps

tothe

programmed

rrartlo

stitching

pattern

1in

ordertosew

^

Step

the

pattern

6

s a a a

•JUKI

1)

Press

the "+"

k

times.

2)

Press

the

machine stop mode selector switches O •

3)

Press

the

4)

Keeponpressing

setting

switch@until20stitches

switch

"+"

side

of step setting

I—I and the

sideofstep

the

"+"

setting

sideofstep

®Fl

switch

switchI-r-|

switchOonce.

are

O three

stitch

number

reached.

iSBi

Fl!

Indicationonthe

of

Indication on the panel |

indicationonthe

ra.

panel

j ^

J

Step1120

Indicationonthe

jn

panel

u

20l

Steps

I

5)

Press

the

switch

S machine stop mode selector switches O .

6)

Press

the "+"

7)

Keep on pressing the

setting

switch0until30stitches

8)

Press

the

machine

9)

You can set up to 15 steps.

10) By turning ON or OFF automatic (for start) switch O and automatic

(for end) switch © , you can

perform reverse stitching at the sewing start and/or

end.

(This cannot be programmedfor each step.)

switch

stop modeselector

i—I

and

the

side

of step settingswitch O

"+"

sideofstep

f—i

and

the

switches

switch

stitch

are

reached.

switch

© .

reverse

make

the machine

again.

number

f^l

stitching stitching

Indicationonthe

mdicationonthe

of

panel

Indicationonthe

D n

Indicationonthe

panel

u

panel

(4)

Programmed

By

pressing

pattern

The

1.

panel

indications

Automatic

number

displays

stitching

programmed

and

reverse

stitching

(Ato D) ®

pattern

stitching

(for

will

^

pattern2switch

pattern

start)

show

storedinmemory

switch

[3]

S [2 H] .

@

® ,

and

you

can

areasshown

automatic

perform

reverse

check

below.

stitching

and

change

(for

end)

justasinthe

switch

programmed

a

O

are

ON,

stitching

and

stitch

The

"+"

sideofswitch

0 ispressedonce a,

a

time

•JUKI

ac-3ao"

Indicationondisplay

0

•J

J

Indicationondisplay

0

I D

I U

U

I

c n

D u

0

i

1

n

0

@ o 0

Indicatorlamps o

The

following

cr

lamps

light

i-f

'•

o

1 D

L.

o

140

up

0—6—0

Stitching

4

12

1'D1

pattern

12

0-<

\4'

0

4

iX

•

~sl

5

D C

c n

J u

°4-

50

4

I D

I

L.

n

u

-

17

-

(5) Inserting or deleting a stitching pattern

Based on the programmed stitching pattern 1, you can modify

step deletion switch O .

e

1

m

aJUKI

8C-3aO

.'1

ISl l!l

s s a a

0000

/ ! 1

0 0 0

1.

Step

insertion

1) Press programmed stitching pattern 1switch © .

2)

Press

step insertion switch O once.

switch

O

Indicationonthe

your

stitching pattern using step insertion switch O and

^ Q

So

Step

1

20

\ 5 5 ^

Step

panel

2^^

1

o

L u

10

Step

J n

u

Step

6

10 T

20

3

Step

4

5

3) Keep on pressing the " sideofstep stitch number

settingswitch O until 5 stitchesare reached.

* By so doing, 5 stitches have been set for

the machine stop mode for stopping with the presser foot up and needle down has been inserted.

4)

Press

the "+"

5)

Press

step insertionswitch O once.

6) Keep on pressing the " sideofstep stitch number

setting

* By so doing. 5 stitches have been set for step 4. and

the

machine stop mode for stopping with the presser

foot up and needle down has been inserted.

7)

Press

the

side

of step setting

switch

O

until5stitches

"+"

sideof step setting switch © twice.

switch

are

step

reached.

indicationonthe

2. and

Indicationonthe

indicationonthe

1st

indicationonthe

panel

ff;

o

u

3

j

u

1

u

1

c

3

c

3

1 n

u

/ n

1 u

c

3

3 n

u

ff"

8) By depressingthe front part of the pedal, you

can sew the pattern illustrated above.

2nd

indicationonthe

* If the number of stitches and the machine

-

18

panel

the same,

same sewing conditions by pressing step insertion switch

-

c

O

you

can set the desired

/ n

1 u

numberofsteps

stop

mode are

of the

O-

•

Step

deletion switch O

The

following

the

stitching

pattern

procedure

1.

Step

isusedto deletea step,

_ 4

Steps

' Q

10

1

20

Step

which

5

has

been

inserted

using

c>

step

insertion

switch

O , inorderto

Step

3

restore

\5

Step 10 Step 4

Step

5

3

1) Press the "+" or " side of step setting switch ©

to

set

it to

step

1. indication on the panel

* If the machine is sewing a step, depress *he back part

of the pedal to trim the threads before working on

this operation.

2)

Press

3)

the "+"

Press

Stepdeletion switch © once.

side

of step setting

switch

©

once.

Indicationonthe

* The 5 stitches in step 2 and the machine stop mode

(machine

down)

stop

are deleted.

with

the

presser

foot up and

needle

Instead, the subsequent step 3 with 10 stitches and

the same machine stop mode becomes step 2.

4)

Press

the"+"

* By this deletionofone step, step 4 with 5 stitches is

side

ofstep

setting

switch©once.

Indicationonthe

replaced by step 3 with 5 stitches (the number of

stitches remains unchanged).

panel

Step

2

3 n

L.

Zi

u

3

1 n

1 u

3

j

1^

U

c

3

Iff

c

3

5)

Press

stepdeletion

* The 5 stitches in the previous step 4 (replaced by

step 3 in 3) above) are deleted, and the subsequent step 5 with 20 stitches is replaced by

6) Pressthe sideof step setting switch © once.

* As a result of

with 10 stitches is replaced by step 4 with 10 stitches

(the numberofstitches remains unchanged).

7) By depressing the front part of the pedal, you can

sew the stitching

switch

the

pattern

©

once.

step

3.

deletionofthe two steps, step 6

1 (shown at

top

right).

Indicationonthe

-

19

-

panel

3

u

f

n

u

/ n

1 u

(6) How to operate the restart switch

The

restart

switchIstypically

usedtorestart

sewing a

step

afteranempty

bobbin

has

been

replaced.

@19

•JUKI

The bobbin thread has run out while

Set the pedal to the neutral position to stop sewing, and

depress the back part of the pedal to trim the threads.

o

Press

restart

switch

Replace the empty bobbin, route the bobbin thread, and

move

the

material

stitches in step 2. O

Depress

depresseduntil stop point Q of step 2 is reached.

the front part of the

o . o

back

a little to overlap the sewn

UUUU

+ +

sewing

pedal.

Hold the pedal

r+

a step. O

+

6)

At

stop

point

Q ,

press

restart

causes the next step to be displayed as I

the programmed stitching pattern will go on.

* If a thread breaks during the free sewing operation

initiated by restart switch O ( ®

pedal back to its neutral position, and then depress the back part of the pedal to actuate the thread trimmer.

Re-thread the machine, and move the material back a

little

before

you can resume the free sewing operation. After that,

perform steps 5) and 6).

(Note) Follow the procedure shown below when going back

to

1) The bobbin thread hasrun out

2)

Set the pedal back to its neutral position to

and depress the back part

threads. ©

3)

The

step

start from

the

pressing

first step

display

the

beginning.

restart

without

will

show

using restart switch O ^

switch

of

O . By so

while

sewing

the pedal to trim the

I

111,enabling

O .

131

©),

set the

doing,

step 2. O

stop

sewing,

you

This

, and

to

-

20

-

3.

ADJUSTMENT

3-1.

Belt

Tension

Fig. 3-1

An

excessive

belt tension may

damage

the mainshaft bushingof the

machineor the motor bearing. On the contrary, an insufficient belt

tension may

cause

the belt to slipwithconsequent shortenedlifeof

the belt, and alsocause-otherfailures suchasoverrunafter thread

trimming

and

machine

stopswith

uneven

needle

stopheight.

To avoidsuch problems,usea belt of the appropriate length as specifiedin the instruction book. Adjust the belt tension using

nut O sothat the

when it is pressed with a finger.

center

ofthebelt

slacks

about18mm

(0.709")

3-2. Prevention

3-3. Checking

Motor

and

Vibration

Fig.

3-2

Correcting

(forNcompany's

the

Rotational

motor)

At the rearof the motor, there are hexagonbolt O and nut O

for preventing motor vibration between the table and motor base.

Adjustthe hexagonbolt so that it touches the table, then lockit

with

the

nut.

DirectionofSewing Machine

H

company's

N

company's

7

t

Fig.

3-3

Tum

the handwheel by handtobring the needle down. Turn ON the power switch, and check the rotation

directionofthe

observed from the handwheel side. To change the rotational directionofthe handwheel,

the

sewing

handwheel can be changedby using switch 0 mounted on the print circuit board located on the far side from you. ON :

(Note) There are two types of printed circuit boards as shown above.

handwheel.

machine,

CCW

The

handwheel

remove

screw

O in the

(counterclockwise)

should

rotateinits

PSC

box and open cover O . Nowthe rotationaldirectionof the

...

Standard setting OFF : CW(clockwise)

-

21

-

normal

direction,

i.e.,

counterclockwise

tum

as

OFF the power

to

3-4.

Pedal

1)

Adjusting

(1)

(2) Pressure required to depress the back part of

the pedaling

Pressure

of

the pedal

required to

pressure

depress

the front part

Hook pedal pressure adjustingspring O on

the right side to increase the pressure, or hook it on the left side to decrease the pressure.

the pedal

Screwadjustingscrew O in to increase

liniiitliiil/

'iiimiiiiiiiiiiit*^

Highest

pressure

Fully

<=>

screwed

In

Levelled

illlKlilMl

Lowest

1_1

nBiiiinniii

the pressure, or screw it out to decrease

Fig.

the

pressure

withinthe adjusting

range

3-4

shown at right.

(Note)

After

adjustment,

lightly

retighten

the

stopper

with

fingers

2) Adjusting the pedal stroke

The pedal stroke dependswhether the connecting rod isattached to position O or © . The stroke

be

smaller case, change

the

pressure

onlythe

when

the

connecting

requiredtodepress

stroke,

adjust

rodis

the

pedaling

fixedinposition

thefrontand

back

pressure

after

O than

parts

ofthe

fixing

when

pedal

the

connecting

it is

fixedinposition

increases.

rod.

When

you

pressure

want

Stopper

will

to

Pedal

sensorA(asm)

(for version

without

AK-31, AK-34)

-©

Fig.

3-5

Pedal

(for

AK-34)

version

sensorB(asm)

with

AK-31,

-

22

-

3)

Adjusting

variable

resistorsonthe

resistors, adjustment

main

ranges

circuit

board

and functions.

and

Table

adjustment

3-1

range

table

Table

3-1

below

shows

the

adjusting

VRNo.

VRl

VR2

VR

symbol

BT

SOFT

Used to control the reverse stitching speed at sewing start/end.

The

BTVR

alone

controls

is always

200spm.

Used to adjust the speed of soft start for ensuring interlaced

threadsofbeginning

Pi

>

00

VR3

.c

at

a

'5'

a

•a

4>

o.

OT

VR4

LSH

LSL

Used to increasethe sewingspeed in the lowest speed sewing

mode actuated by pressingthe front part of the pedal.

Used to adjust

time

of thread trimming which requires to be performed at low

the

Function

both

BTL

and

stitches.

running speedofthe

BTH.

(The

difference

sewing machine at the

speed regardless of the speed control function of the pedal.

VR

Normally,itis

(If

the

5

MIN

Usedtochange

about

1 mm

LSL

fixed.

is changed,

the

accelerating

(0.039")

the

through

LSH is also

point

pedal

changed.)

from

stroke.

low

speed

by

Adjustment

1000~3500

_ . ,

Standard:

Counterclockwise:

Clockwise:

200~2000spm. Standard:

Counterclockwise:

Clockwise:

LSL~+200spm.

Standard:

Counterclockwise: Clockwise:

150

^300

Standard:

Counterclockwise: Clockwise:

About1mm

Standard:

Counterclockwise:

Clockwise:

range

spm.

BTL

ITOOspm.

i900spm.

Decreases

Increase

SOOspm.

Decreases

Increases

200spm.

Decreases

Increases

spm. Fixedto200spm.

Decreases

Increases

(0.039")

Fully

clockwise

Low

speed

stroke,

Low

speed

short

storke,

long

VR6

FLSW

Used to adjust the position where the presser foot is raised

by depressing the back

part

of tlie pedal in a version with

Standard:

RefertoP.25.

AK-31, AK-34.

Pi

>

00

c

at

p

VR

•a'

C3 V

o

at

£

VR8

TSW

7

Used to adjust the position where tlie thread trimmer is

actuated by depressing the back part of the pedal.

LSW

Used to adjust the stroke for starting sewing by depressing

the

front

partofthe

pedal.

Clockwise:Increases

Counterclockwise:

Standard:

RefertoP.24.

Clockwise:

Counterclockwise:

'

Standard:

RefertoP.24.

Clockwise:Increases

Counterclockwise:

Increases

stroke

Decreases

stroke

Decreases

stroke

Decreases

stroke

-

23

-

4) PedaladjustmgVRand its function in detail

ErHl"B

-IICI

I

Standard

ETjsP

S 1 VR« VR7 VR*

5—1

F—2

value

Rsr

I

rn

fusw''Tsw'

Fig.

Pedal

sensorAasm.

(excluding

•

rn

'tsw'

SZlHihB

3-6

the

AK-31 and -34)

(1)

Adjustmg

the pedalstroke

o How to adjust the stroke of the pedal before starting

sewing.

The stroke can be adjusted usingVR8

(LSW).

Turn

this dial clockwise O using a small screwdriver

increasethe pedal stroke, or counterclockwise O to

decrease it. (Take care

nottoturn

the dial excessively,

otherwise the sewingmachine failsto stop when the pedal is returned to its neutral position or failstorun

when the front part of the pedal is depressed.)

Pedal

sensorBasm.

(for

the

AK-31

and

-34)

to

Fig.

3-7

o Howto adjust the pedal stroke for turning ON the thread trimmer

The

pedal

strokefor

clockwisetoincrease

(Takecarenot to tum the dial

returned

to its

turningONthe

the

neutral

thread

trimmer

stroke, or counterclockwise to decrease

excessively,

positionorthread

otherwise thread

trimming

canbe

isnotactuated

adjusted

trimming

depressed.)

Standard

value

Pedal

sensorAasm.

(excluding the AK-31 and -34)

I

using

VR7

(TSW)inFig.

it.

isactuatedimmediately after the pedalis

even

when

thebackpart ofthe

Pedal

sensorBasm.

(for

the

AK-31

and

-34)

3-6.

Turnthis

pedal

dial

is

OO,

Fig.

3-8

-

24

-

Standard

r-^

value

Pedal

sensorBasm.

u u

Fig.

3-9

o Adjusting the accelerating point (from200 spm)

Asshown in Fig. 3-10, the acceleratingpoint can be

adjusted

about1mm(0.039").

When

VR5

(MIN)

shownin Fig. 3-11is turned fully clockwise, the low

speedstroke shownby the solidline (Fig.3-10)is

shortened,

When

resulting

in an earlier accelerating

timing.

VR5is turned counterclockwise, the lowspeed

stroke is lengthened'as shown by the broken line,

resultingin a later acceleratingtiming.

(Normally, VR5 is turned fully clockwise before

shipment.)

o Howto adjust the stroke for actuating the

or

-34

Auto-lifter

For the sewingmachineprovidedwith the or -34,depressing the back part of the pedalraises

the presser foot just as with the knee switch.

Adjust the stroke for actuating the auto-lifter

usingVR6 (FLSW)in Fig. 3-6.

clockwisetoincrease

wisetodecrease

(Take care

nottotum

the

it.

the dial excessively,other

wise the auto-lifter will be

if

the knee switch is

kept

Tum

this dial

stroke,orcounterclock

kept

in its ON state as

turned ON when the

pedal is retumed to its neutral position.)

Fully

clockwise

Fully

counterclockwise

Low

About1mm

(0.039'

speed

AK-31

3-5. Maximum sewing speed

1) Adjusting the low speed

-pot

eev y M(

I

cc a S S R87 5

....

xoc

itu.

j f 3

M

n^an

r-MOO—

J?'

VR2

VR3

LSH

Fig. 3-11

VR4

LSL

rnrnrnrnrni-

I I I I I I I I I I

BT

SOFT

s I

VR5

MIN

, • o

o~

S - m

s--s

mm

B-IUI

mm

Pedal

stroke

Fig.

3-10

o In the conventional

sewing

machine,thread trimming

speed determines the low speed. In this machine,

however,only the low speed which is controlled by

of

depressing the front part

the pedal can be increased

usingVR3 (LSH)in Fig. 3-11 without changing the

thread trimming speed.

Tum

the dial clockwiseto

increase the low speed of the sewingmachine, or

counterclockwise to decrease it. The adjustablerange

isfrom the thread trimming speed(LSL)to approxi

mately

200

s.pjn.

(Normally, the dialhasbeen tumed fully counterclock

wiseat the timeofdelivery.)

-

25

-

2)

Howtoadjust

Direction

larger scale values

i ^

.2

ai

s I

IT S

the

Direction

smaller

toward

maximum

Fig.

3-12

toward

scale

value

Fig.

3-13

sewing

w

Pedal

stroke

speed

(for

the

4,000

s.p.m.

type

PSC

box)

The

maximum

sewing

speedisadjusted in the twodifferent

ways,i.e. by using400 s.p.m.-stepspeed control knob

( @ in

maximum between the rotational

pedal

Fig.

3-12)

whichisdesignedtochange

sewing

speedwithout

stroke(hereinafter

speed

called

changing

of the

the relationship

sewing

"start-up")or by

onlythe

machine

using

andthe

max.sewingspeed control knob ( O in Fig. 3-12) whichis

designedtochange

start-up.

the max.

sewing

speedbyretarding

The former method is equivalentto the conventionalmethod

to adjustthe

latter

sewing speed control knob.

The

actual

max.

sewing

methodisequivalent

max.

sewing

speed

speedbyreplacing

to the

adjustment

will

bethe

lower

pulleys,

using

one

andthe

the specified

usingeither O or © .

(1) 400 s.p.m.-stepspeed control knob

400 s.p.m.-stepspeedcontrol knob can be set to 16

different steps from 1 to 16 in 400

s.pm.

steps.

The sewingspeed, therefore, can be adjusted to

400

through 4,000 s.p.m. with ease.

This method of limitting the maximum sewing speed

increases/decreasesonly the maximum sewingspeed without changingthe start-up as shown by the

arrows in Fig. 3-13. The desired sewing speed can

be easily reached even when the max. sewing speed

is

settolow.

The relationshipbetween the scaleof the switchand

the sewingspeed is as shown in Table3-2. The max.

sewingspeed changesafter thread trimming or re-tuming ON the power to the machine. Conse

quently, the changingof the switch during sewing

will

not

be effective until the machine performs

a thread trimming.

the

max.

Scale

Max.

S a>

Ol u>

value

sewing

speed(s.p.m.)

Fig.

3-14

1 2 3

400

^

^Counterclockwise

O ^ \ /

Clockwise

Pedal

stroke

800

Table

1200

7

3-2

4

1600

5

2000

6 7

2400

2800

(2) Max.sewingspeed control knob

The

functionofthis

the conventional max. speed control knob. Turn

the

dial

knob

clockwisetoincrease

speed of the sewingmachine, or counterclockwise

to decrease it. The rangeofadjustable speed is

from 200 to 4,000 s.p.m. In this method, the

max. sewing speed is changed with the start-up

retarded,

which

the one described in (1).

The max.

sewing

0 to © by turning the dial knob counterclock

wise.

This dial knob is designedtouse the pedal stroke

to the full until the specified max. sewing speed is reached. On the contrary, speed acceleration on the way issluggish.

8

3200

dial

makes this

9

3600

knob

method

10~16

is as

sameasthat

the

4000

rotational

different

from

isdecreased in the order as O to

of

It is

advisable

to adjust the start-up by appropriatelycombining methods(1) and (2) by meansof knobs O and ©

accordingto the sewingprocessor to the operator's convenience.

-

26

-

3-6.

Auto-lifter

The Auto-lifter is available as an option.

It is

designedtoautomatically

of thread trimming.

To

operate

(When

AK-34,the transistor circuit board assemblyand pedal spring(AK-31,AK-34)in addition to the AK-30,

AK-31,AK-34).

1) How to use

the Auto-lifter,

the Auto-lifter is added to a

the

Auto-lifter

The Auto-lifter comes in two different types.

Knee

switch

raise

and

hold

the

function selector switch on

version

AK-30,

AK-33

the

presser

foot

for60

the

main circuit board should be set to ON.

whichwasnot originally

Fig. 3-11

seconds

designed

orfor10

for the

AK-31,

minutes

AK-30,

AK-34

after

completion

AK-33orAK-31,

Neutral

\ Thread

AK-33

or

Presser foot lifting

trimming

When

it is

partof the

lower

the

release

the

2)

Adjusting

necessary

pedal

forthe

presser

foot

knee

switch

the

to stop

AK-31,

immediately

after

height

ofthelifter

sewing

and

raise

AK-34).

The

afterithas

depressingit(for

(AK-33,

the

presser

moment

been

the

AK-31,

-34)

foot

you

raised

automatically,

AK-34,

during

sewing,

release

the

depress

Rotate the solenoid shaft using screwdriver O .

then tighten the clampingscrew usingscrewdriver

® .

At this time, adjust the solenoid

to

the

depress

switch,

directionofthe

the

depress

the

back

presser

the

partof

the

front

knee

foot

part

the

arrow.

switch

comes

ofthe

pedal).

while

(depress

down.

pedal

pressing

or

the

To

back

it

-

27

-

3)

Adjusting

the

height

ofthe

7

lifter

(AK-30,

-31)

0

Loosen

0

Loosen

(A)©

(D

Inthe

solenoid,and confirm that the lifting amoimt

of the If

adjusttheheightof the

plunger

footisnot

heightof the

the plunger clockwise.

0

Actuate

untilitcomesincontact

0 Turn OFF the knee switch. Then further move

up stopper (A) 0 by one turn.

locknut

the

,and

state

presser

the presserfoot is

O ofthe

locknutofpresser

fully

lower

describedin0,

foot isapproximately10 mm.

raised

0 counterclockwise. If the

raisedashigh

presser

foot to 10 mm by tuming

the

solenoidtoraise

connecting

lifter

thestopper

actuate

beyond 10mm,

presser

foot by tuming

fitting.

stopper

(A).

the

presser

as10mm,adjustthe

stopper

with

the

oil reservoir.

(A)

0

0 Tightenthe locknut of stopper(A) 0 and the

locknut of the connectingfitting.

0

Raise

presser

lifter

stopper

in contact with the oil reservoir,and adjust the clearancebetween knee lifter pushingrod 0

and the indented sectionof

lever O .

(B)0imtilitcomes

presser

barlifting

0 Tighten thelocknut of stopper(B) 0 .

Fig.

3-12

(Caution) The lifting

(A) 0 . However, If you wish to change the liftingamount of

step 0 through

amountofthe

the

presserfoot may fail to go up if

0.

presser

foot

can be changed

3-7. How to reduce the hand light from flickering

only

by raising or lowering presser lifter stopper

the

liftingamount isset to an excessivevalue.

the

presserfoot, be suretofollow

(for

single phase only)

When you rapidly accelerate the sewing machine, the

hand light or the room lighting may flicker. This is

causedby a line voltagedrop due to the abrupt start and acceleration

no harm to the performanceofthe

To

reduce

the light flick,turn

of

the PSC box in the directionofthe

screwdriver.

(If

you do this, the risingspeedofthe sewingmachine

will decrease.)

the

seriesof procedure from

of

the motor. Such flickering will do

sewing

machine.

screw

O on the back

anow,

using a

Fig. 3-13

-

28

-

4.

FUNCTIONS

4-1. Power

supply

voltage

200V-band (for H company's motor)

^Black

Volts

200 220 240

Amps

^iTTT'Ti

TypeDlAEAS

JUKI

CORPORATION

Mad«inJapan

0.5(CONTROLL£R)

Phase 3

Hertz

50/60

Mfo.No.(

lOOV-band (for H company's motor)

^

Black

|H|HH

MTTT^n

Type

D1BEAS

JUKI

CORPORATION

Made m Japan I

Volts

Amps

O.SICONTROLLEfl)

Phase 1

Hertz

50/60

Mfg

No.i

120

3(M0T0R)

6.5(M0T0R)

There are

a power supply voltageofabout

about

They

200V.

can be

two

typesofPSC

told

box,

apartasshown

one for use with

1OOV

and one for

in Fig. 4—1,

from the numbers following "Volts O " on the

of

the

numbers

the

the PSC box.

are

200V-band

In

the

lOOV-band

200V,

name plate O on the side

For

the

200V-band

200 220

For 100

For

voltages

220Vor240V

lOOV, 1

240.

the

lOOV-band

no

120.

each

box

can

lOVor120V

box

anyof3 actual power supply

be selected. In

canbeselected.

The switching is done as follows.

How

<

(l)

to switch the

Tum the

Tum

power

the fuse holder cap in Fig.

power

OFF.

supply voltage >

4—2

in the

direction shown by the arrow, using a coin,

not

then remove the cap. (Do

use a screw

driver to remove the cap. Use a coin.)

200V-band(for N company's motor)

^

Blue

Volts

200 220

240

O.SICONTROLLER)

3

50/60

I I

aSICO^ROaERI

3(M0T0R)

—^

6.5(MOTOR)

f"

4-1

HTbTwI

Type

D1AEAS

JUKI

CORPORATfON

MadeInJapan

1

OOV-band

^

Blue

Type

D1B

JUKI

Made

EAS

CORPORATION

inJaosn [

Amps

Hertz

Mig

No.r

(for N company'smotor)

^m|^

Mfg.

No.

Fig.

< How to switch the power supply voltage >

(T)

Turn

the

power

OFF.

Turnthe

fuse

holder

capin

Fig.

4-2in the

(Do not use a screwdriver to remove the cap. Use a coin.)

j

1

direction

shown

by the

arrow,

using

a coin,then

remove

the cap.

Fuse holder Plug

Fig. 4-2

-

29

-

@

Unplug

then

(J)

Tighten

Note1)Any

whenchangingvoltageon one box.

Note

2) The

the

plug

showninFig.

plug it back in.

the

cap

withacoin.

of3

power

fuse

capacities

supply

forthe

4-2,

voltages

lOOV

change

the

play

angle

until

canbeselected

with

one

PSC

bandand the 200Vbandare

Table

4-1.

the

desired

box.

Itisnot

giveninTable

voltage

indication

necessaiytochange

4-1.

becomes

visible,

the

fuse

4-2.

Functions

1)

Main

Remove

visible

(Thereisdanger

when

Voltageband Operatingvoltages

lOOV

band

200

band

selection

circuitboard dip

set

screws

on the front right part of maincircuit board O .

resetting

the

switches

O on

when

front

switches.

switches

PSC

cover9is

The

box

front

function

coveroand

opened,soalways

will

not

change,

•

remove

turn

even

Fuse capacity

4A

250V

3A

250V

the

front

cover.

Then

the

power

OFF.

Also,

ifa

switchisreset,aslongasthe

dip

turn

switches

the

power

powerisON.)

1to 6

OFF

are

Change-overofswitch

Off

stateofswitch

On

stateofswitch

o o o

P5

TP6 TP7

5V S.GND

function

SWI

+'8y

SW2

LH

ex

SUB

JMAX

PKEUF

M400I

SNUMA—D

J240

1^0.^

301

OATR o

FLuo

EVON

TPMH

SC/EC TESTA

TESTB

TESTP

S8TM/A

WIPON

NFEEO

BSRPT HOSAO

HOSAI

HOS0O

HOSBl

I

•

UPTRM

SCMBT

SOFTON

SOFTI/2

o

^

SCMATR

SCMESP

ACTA

ACTS

ACTD

BDw

CM^

OK-

^KP-45V-0

DDL-5550-6 isshown asset at the time of factory shipment.

_

30

- Fig. 4-3.

2) Tableofdip switches and their selection functions

The namesofthe

dip switches and their functions are summarized in Tables 4-2-1 and 4-2-2.

Table

4-2-1

Dip

SWl

SW2

SW3

SW3-3

SW3

SW4

switch No.

-4

-2

-6

7

- 1

-2

-4

Switch

SNUMA~D

PNEUF

FLUD

REV

TESTA

TESTB

SET M/A

WIPON

BSRPT

abbreviation

ON

Official

switch

name

Stitch

Number

A ~ D

Used to select

numberofstitches for Nofpattern

Pneumatic

Foot

Lift

Usedtoselect

presser lifter lifting switching.

The

presser

trimming

andiskept

SWS - 1 and -2 are settorespective ON positions.

(If

only

SWS - 1 is settoits

footiskept

Foot

Lifter Up Delay

Reverse

On

Usedtoselect

when

turningONthe

Used to select

the

machineinthe

trimming.

TESTA

TESTB

Start

Back

Tack

Manual/Auto

Used to select

gramsinaccordance

1.

Speed

test

Used to select of

sewing

and

Wiper On Used to select

Bar

Stitch

Repeat

Usedtoselect

Siunmaryoffunctions

the

manual

countback,

the

"without

foot

automatically goes up

control"

raised for 10 minutes

ON position,

raised for 60 seconds.)

the

delay

timeof30 msor60 ms

presser

lifter

the

functiontoraise

reverse

direction

oneofthe

the

following

with

2.

howAandBare

Input

check

reverse feed stitching at

speed

control

wiper program

overlapped

sewing

settingofthe

3 for

mode

switch.

the

after

three

3.

Synchro,

function.

pattern

the

after

the

needle

thread

test

the

SC-220.

using

the

thread

when

presser

rotating

pro

combined.

check

start

Dip

SW5

SW6-3

SW6-4

switch

SW5-

SW6

SW4

SW6

SW4

SW6

-1

-4

-5

- 5

- 6

- 7

- 1

FLON

2

No.

7 8

6

8

2

FLPW

UPTRM

SCMBT SCM

SCM

Switch

ATR

ESP

abbreviation

SOFT

ACT

HOSA

ACT

HOSE HOSB

ACT

HOSD

ON

1/2

A

0

1

B

0

1

D

0

i

Foot

Lifter

Foot

Lifter

UptoTrimmer

Simple

Count

Simple

Coimt

Trimmer

Simple

Count

Official

Soft

Start

Soft

Start

Active

Timing

Correction Correction

Active Timing B

Correction

.

Correction

Active

Timing

Correction

On

Power

Back Back

Back Enable

Table

switch

On

1or2

A

A 0

1

B 0

1

B

D 0

1

Mitigation

Tack Auto

4-2-2

name

to

select

the

foot.

the

stop

the

machine

Summaryoffunctions

selection

1-stitch,

Stop

Used

presser Used to select

device.

Used to

pedal

is settoits

Used to select

Usedtoselect

Used to select

back

Usedtoselect

sewing

Soft

start

Soft

start

SET, reverse feed solenoid ON timing

selection

^Selectionofcorrection

SBT, reverse feed solenoid

selection

^Selectionofcorrection

EBT,

reverse

feed solenoid OFF timingcorrection

selection

^Selectionofcorrection

functiontoautomatically

presser

foot

lifting

machine

neutral

is at

with

its needle up

position.

thread trimming

manual

count

thread

trimming

manual

count

rest.

1-stitch

2-stitch

selection

with

back

after

back

amount

OFF

timing

amount

power

the

manual

even

when

correction

lift

the

lightening

when

the

needle up.

count

the

SW6

- 8

H/N

Hitachi/National

Hitachi,

-

31

Matsushita,

reduction

curve

selection

Notes)

o Ifanydip

switches

otherthan

those

inthe

tables

(SW2-1,2,3,SW34,

5,8,

SW4-3,

SW5-3)

are turned ON,there isa dangerthat the sewingmachinehead willbe damaged. Absolutely do not

touch

them.

o Selectfunctions with the powerOFF.

(While

the poweris ONthe function selectionswillnot change.)

3) Detailed explanationsoffunctions

(1) Starting automatic reverse stitching speed selection

Select whether the starting reversestitching speed is to vary with the amount the pedal is depressed or to

depend ON: The set number of stitchesareallsewnat the speedset by BTVRand LSLVR

solelyon the speedsetting. Thisselection is

far the pedalis depressed (consequently,

pedal is in neutral).

sewing

made

with

SW4-1

(SBT

M/A).

regardless

cannotbe stopped in the middleevenwhenthe

OFF: The speed depends on how far the pedalis depressed (except that the speed cannot exceed the

upper limit set by BT VR). In pedal priority operation, sewingcan be stopped in the middle by

putting the pedal in neutral (during reversestitching step, turn the solenoid OFF while sewing

is stopped).

(2) Wipercontrol selection

Selectwhether or not wipercontrol is to be applied(when wiper control is to be not applied temporarily,

this can be accomplished with the switch on the head).

Make this selection with

ON: After thread trimming the wiper solenoid comes ON for about 45ms and the wiper operates.

Also, when

SW4-2

(WIP ON).

the

Auto-lifter has been selected, there is a delayofabout 30ms before the shift to

presser foot lifter control (to allow time for the wiper to return).

OFF:

Wiper

is not actuated (For this reason,whenthere isan Auto-lifterit takes 45 ms for suction and

30 ms for return for a fast total time of 75 ms, then the presserfoot risesautomatically.

(Caution) if

SW3-2

the the

(FLUD)issimuhaneousiy set to its ON position, the time required to start controlling

presser

lifter

presser

is changedtoapproximately60ms. (This

foot

comesincontact

with

the

wiper.)

function

is useful in

the

case

of how

where

the

(3) Selection of

back-up

needle

raising

after thread

trimming

Whenthe presser foot is raised after thread trimming, when the needle tip gets in the way below the

presserfoot the sewingmachine can be backed up to the vicinity of the needle upper dead point. Make

this selectionwith SW3-3.(REV ON)

ON: Needle can be raised by backing sewing machine up

(but

in this position the balance is lowered

quite far, so the needlethread should be drawn out farther than normal from the needle tip).

OFF:

Back-up

(4) Selectionofroutine needle-up stop function

When this function is selected, whenever the needle is stopped by putting the pedal in neutral it stops in

control is not applied after thread trimming.

the upper position. Make this selection with SW5-4 (UP TRM). ON: Needleroutinely stops in upper position (in this case,run the sewingmachine one cycle by pedal

return, trim the thread and then stop it again in the upper position).

OFF: Needle stops in lower position.

(5) Selection of soft start function

When

the

sewing

interlaceat the start of

pitchisfine

sewing

orthe

the

needle

isthick,

sewing

stability can be improved by limitingthe

when

the

needle

thread

andbobbinthread

sewing

machinespeed

during the first or second stitch at the startofsewing.

Make

this selection with combination of

(refer to Table 4-3).

Nameofswitch

SW5 SOFT

- 7 ON

SW5

SOFT

- 8

1/2

SW5-7

(SOFT ON) and SW5-8 (SOFT 1/2).

Table

4-3

Output

function

fail

to

OFF

ON

OFF

ON

OFF

ON

Soft

start

function does

Soft start function operates during first stitch.

Soft start function operates during second stitch.

-

32

-

not

operate.

(6) Selectionofmanual countback control function

Numberof stitches limitation and thread trimmingcommand functions canbe added to the touchback

switchonthe

head.

The number ofstitchesisset by the rotary switches (SWl

This

Application

o

0

O

©

selectionismade

SW5

- 5

SCMBT

OFF

ON

using

Nameofswitch

SW6

- 3

SCMATR

ONorOFF

OFF

ON

SW5-5

(SCMBT),

SW6

SCMESP

ONorOFF

OFF

ON

OFF

ON

SNUM

A to D)on the main circuit board.

SW6-3

(SCMATR)

Table

4-5

-4

Manual countback function does not operate.

Whenthe pedal is depressedand one-touch type reversefeed switch

is operated, the number of switches set by the rotary switches

(SW 1 SNUM A to D) are reverse-stitched.

Even when the sewingmachine is stopped, when the pedal is depressed and the one-touch type reverse feed switch operated

the number of stitches set by the rotary switches (SWl SNUM A

toD)are

Whenthe pedal isdepressed and the one-touch type reverse feed

switch operated, the number of stitches set by the rotary switches

(SW 1 SNUM A to D) are reverse-stitched, and then the thread is

trimmed.

Even when the sewing machine is stopped, when the pedal is

depressed and the one-touch type reverse feed switch operated

the number of stitches set by the rotary switches (SWl SNUM A

to

D) are reverse-stitched,

and

SW6-4

reverse-stitched.

Output

and

(SCMESP)

function

then

the

threadistrimmed.

(referto

Table

4-5).

O

0 0

O

©

Usedasa

Used Used

Usedasstart

ofthe

Usedasstart

ofthe

machine).

In the

o During

regular

one-touch

for

reinforcement

for

reinforcement

switch

pedal;

operates

switch

pedal;

operates

following

numberofstitches

type

stitchingofpleats, stitchingofpleats

for

terminal

only

while

for

terminal

whether

cases,

the

manual

reverse

feed

switch.

(only

reverse

the

sewing

reverse

sewing

operates

(operates

stitching

(used

machineisrunning;

(used

machineisrunning

while

whether

the

sewing

insteadofthread

particularly

insteadofthread

orstopp^;

the

countback controlisinoperative,

count

control

o Duringstop after thread trimming

o

While

TSWisON

immediately)

o

WhenBTswitch

On

SWl

SNUMAtoDare

SNUMAto

(when

TSWisturned

isturnedON

D

usedtoset

ON

during

countback control

the

numberofstitches

while

manual

when eitherofthe following two functions is selected.

o Whenmanual countback is selected, the numberofstitches

is

indicated.

sewing

machineisrunning).

machineisrunningorstopped).

trimming

particularly

countback

engagedbydepressing

useful

withastanding

engagedbydepressing

useful

withastanding

isin

progress,

BTSUB

JMAX

PNEUF

the

back

machine),

back

part

sewing

the

sewing

threadistrimmed

SNUMA'^O

M400I

Fig. 4-5

o ; Needle entry point

• : One-touch type reverse

feed

switch

ON

X ; Thread trimming

When4 is set, asshown in Fig.4-4, the number of stitches

isasfollows.

Here,

when

the

number

ofstitches is0, thread

is performed unmediately.

(Notes)1.The

numberofreverse

in

both

forward

and

reverse.

2. Insert a screwdriver Into

_ 33 _

arrowtochange

the

Fig. 4-4

stitchesisthe

the

groove shown by

number

ofstitches.

301

trimming

same

[

o Whenthe SC-220panel is used, when pattern No. 3 is selected the numberofstitches for start reverse

stitching and

finish

reverse

stitching isindicated. 4

When4 is set as shown in Fig.

44,

the stitchingis

done as shown in Fig. 4-6.

Notes) 1. The number of reversestitches is the same

in

both

forward

and

reverse.

2. Insert a screwdriverinto the grooveshown by the arrow to changethe number of

stitches.

(7)

Selectionofautomatic presser foot lifting function

Fig. 4-6

The presser foot is operated automatically by a solenoid without need to use the lifter lever, when the automatic presser foot lifting function is selected.

Make

FL

ON

OFF

ON

thisselection

FL

OFF

ON

OFF

PW

using

a combination of

SW5-1

Table

(FL ON)and

4-6

SW5-2

(FL

PW)

(referto Table4-6).

Control applied

Operation independentofthread trimming and sewing machine operation.

When there is no Auto-lifer, use these settings.

Disable

Auto-liftercontrol (raised automatically for 60 seconds after thread trimming).

ON

Auto-liftercontrol (after thread trimming,raisedfor 10 minutes unless there

is some input from the switchesincluding the FL SWor L SW.)

In addition, the aforementioned combinations of the switches can also control the valvesby

setting SW2-4(PNEUF) to its ON position.

ON : Valvesare controlled pneumatically or hydraulically. (The signalretaining the

presser foot is set to non-switching

output

state.) DC34V

OFF : Valvesare controlled by solenoid. (The signal retaining the presser foot is set to

ON/OFF switchingoutput state in 2.5 ms intervals.)

(Caution) When

the

position.

solenoid controls

If it is

settoits ON

the

valves, be suretoset

position,

the

solenoid

the

PNEUFtoits

willbeburnt

OFF

out.

In addition, when pneumatic or hydraulic valvecontrol is made, be sure to follow oneofthe procedures mentioned below. And be sure to add a diode on the outsideofthe circuit board or add a jumper wire on the circuit board.

If

you do

not

add oneofthese, the transistor

circuit board might be injured.

1) Add a diode outside the circuit board

Additionallyattach the diode between terminals 3 and 4ofthe presserhfter

connector as shown in the figure.

P48

4 3 2 1

Q O O O

Diode

U05E

(Part

No.

HG26740140P)

7

i

\

Pneumaticorhydraulic

(Caution)

Take

in

the

care

nottoattach

wrong

direction,

the

presser

-

34

diodeinthe

lifter

transistor

-

wrong

valve

direction,ifthe

and

diode

maybeburnt

diodeisattached

out.

2)

Addajumper

(a)

(b) Fit a

(c)

wire

onthe

Remove

with

shownonpage

circuit

Re-install

removing it.

the

power

"replacementofpower

57of the

single

copper

board

and

the

power

(Whenajumper

power

supply

circuit

supply

circuit

board

supply

circuit

Enginner's

wire

00.5to 01.0 inthe

solder

it.

supply

circuit

board

wireisadded,adiode

board

from

Manual.

inthe

isnot

inside

board

position

PSC

required

inthe

PSC

box.

ofthe

PSC

assembly

A , or

indicatedasW8

boxin the

tobe

attached.)

boxinaccordance

assembly

on the

inverse

order

B

electric

of

O Q

GND

61®^

Y*33V J5===-.=-=-j=--=-.J^irs=-_r^.r''

m

(8) Test program selection

Anyof 3 test

programs

canbe

asin the table below,(refer to Table 4-7).

o'""

.5VT-ais

M4101

selected

by a

IS .-i

y

—I

7)

Z

S

WP

o

30

rpRM®

•aD'.tl

(0 o

sj

combinationofSW3-6

Table

4-7

TP1

s\

\

w

O

s t

I -

e

BT

PCW®™"REV

aJUi«

(TEST

A)and

SW3-7

(TESTB)settings

TESTA

ON

OFF

ON

★

Speed test program

This

testis

usedtomake

TESTB

OFF

ON

Speed

test

(SC-320 indicates rpm)

Switch

input

Synchro test

*

Make

sure

certain

adjustments

Test

test

TEST

such

P is

asthe

OFF.

low-speed

Applicable units

SC-20,

120,220,

SC-320 used as the checker)

SC-320 (but applies to all units if an SC-320 is

used as the checker)

Five

(but

rpm

and

different

applies to all units if an SC-320 is

automatic

320

reverse

stitching

speeds

canbe adjusted by repeatedly

rpm.

depressing and releasing the pedal, as shown in

Table

4-8.

The

speeds

the 4

potentiometers

inside

the

BT

SOFT LSH LSL

areadjusted as

PSC

front

Reverse feed speed

Soft

Pedal minimum speed Thread trimming speed

showninFig.

on the main circuit board

cover.

start

speed

4-7,with

Fig.

4-7

-

35

-

Table

4-8

Indicator No.

50

51

52

53

54

Check

Low

speed-*—•High

1

Stop

I

Low

speed

i

Stop

I

Soft

start

i

Stop

i

Automatic

low

speed

i

Stop

Automatic

high speed

item

(thread

reverse

speed

trimming)

feed

Adjustment

High speed

the pedal, maximum speed adjustment dial and

adjustmentdial.

200to400

150to300

(depending on the mechanism

might be flxed at 200 s.p.m.)

200to2000

1000to3500

(when

automatic

speed is adjusted, the fast speed

changesatthe

method

can

be adjusted using

400

s.p.m.

with

s.p.m.

with

s.p.m.

with

s.p.ih.

withBTVR

reverse feed

same

time)

s.p.m.

LSH

LSL

SOFT

VR

VR;

low

VR

Standard

200 ± 20 s.p.m. -•maximum sewing

speed (LSH)

sewing

speed

200 ± 20 s.p.m. (fixed) (LSL)

800 ± 100 s.p.m. (SOFT)

1,700 ± 200 s.p.m. (BT)

High

speed

the

differenceofabout

s.p.m.

1,900

± 200 s.p.m.

same

also changes

time,

with

at

a

200

Stop

n

u

n

u

11

u

c u

i

Notes) 1. When the SC-320 is used, the panel switches to rpm indication as shown above.

2.

Before

lifter

operating the

lever.

sewing

machine,

always

remove

the

needle

threadand

raise

the

presser

foot with the

36

-

Switch

using

malfunction.)

input test

This

isa test of

the

SC-320

Fig.4-8 showswhich

program

whether

indicatorstocheck

(using

SC-320

the

various

input

(while

signal

appearson each indicator.

panel)

switch

testing

signals

isin

are

being

progress

correctly

the

sewing

read

into

machine

the

will

PSC

box

notrun;

microcomputer, this

isnota

Note)

n

u

a Switch input status indication

0 :

OFF

1 ;

ON

To

change

pulley by hand.

Table 4-9

Among

panel

open

main circuit board. The

the

gives

these,

switches

the

PSC

data

select

the list of switches for which the input can be checked.

data

selectNo04 to 09 are

cannotbechecked).

boxfront

n

u

No.,

cover

SC-320

1 /

u

b Test program indication

Fig.

4-8

turnthe

upper

switches

detection

onthe

signal

SC-120

Whenacheckisnecessary,

and

plug

the

SC-320

will function as an input checker.

connector into connector J6l

HD^EB9ii

c

Data

00,

c

ON/OFFbyturning

and

SC220

control

while

the

SC-120orSC-220isbeing

nn

uu

select

01,

the

sewing

boxes

(SC-320)

No.

machine

(the

onthe

2 3

]

SC-320

used

Fig.

4-9

-

37

-

Table

4-9

fta

E «

Head

3> C >

Q.

q

«s

<N

o s CO

o ^

A Work

Pedal depress signal

-

SPDET

C S

Pattern1<(^

SBTSW

«

StepAbit

J=

"5

StepBbit

c

StepCbit

Step D

EDATR

SC/EC (SW3-5)

FLON

SCMBT

SNUMA

SBTM/A

Q

step

indication

(Forward)

A

1

bit

(SW3-1)

(SW5-1)

(SW5-5)

(SWl-1)

(SW4-1)

• •

B Work

step

indication

Input switch or

input

Pedal depress signal

(Backward)

SPDET

B

Pattern

2

EBT

H

1

SW

StepAbit

Step

B bit 2

Step

C bit 2

StepDbit

FLUD

TESTA

FLPW

EDON

SNUMB

WIPON (SW4-2)

N

2

(SW3-2)

(SW3-6)

(SW5-2)

(SW5-6)

(SWl-2)

C Work

signal

step

One-touch

reverse

SPDET

Pattern

ATRM

StepAbit

bit

Step B

Step C

bit

Step D

REVON

TESTB

PNEUF

SOFTON

SNUMC

NFEED

indication

type

feed

switch

C

3

SW

3

bit

3

(SW3-3)

(SW3-7)

(SW2-4)

(SW5-7)

(SWl-4)

(SW4-3)

>§

•

D Work step indication

Lifter

switch

SPDET

D

Pattern

4

bit

u

4

(SW3-8)

(SW5-4)

(SW5-8)

(SWl-8)

(SW4-4)

UP

SW

Step A

StepBbit

Step C

StepDbit

TPMH (SW3-4)

TESTP

UPTRM

SOFTl/2

SNUMD

BSRPT

Numberofstitches

indication

Data

select

No.

00

01

02

03

04

05

06

07

08

09

10

11

12

13

14

15

16

17

18

a

(5

HOSAO

HOSDO

ACT A (SW6-5)

(SW4-5)

(SW6-1)

HOSAl

HOSDl

ACT

B (SW6-6)

(SW4-6)

(SW6-2)

HOSBO (SW4-7)

SCMATR

ACT D (SW6-7)

(SW6-3)

HOSBl

SCMESP (SW6-4)

(SW4-8)

H/N (SW6-8)

19

20

21

22

23

-

38

-

Remarks

Bit 1 to bit 4 in data select No. 03 A, B, C, D

and

05 to09bit

1 to

bit

4 are in binary.

The correspondence between decimal and binary numbers is given in Table 4-10.

Table

4-10

SPDET

Decimal

0

1 2 0 3

4

5 0 1

6

7

8 1

9 1

10

11

12

13

14

15

D

bit

4

0 0

0

1

SPDET

bit

C

3

0 0

1

0

1

SPDET

bit

B

2

0 0

1

0

1

0

1

0

1

A

bit

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

Note)

In maximum speed limit switch read-in,

0 is

takentobe 1, so

the

decimal-binary

correspondence is displaced by 1.

Decimal

16

Binary

0000

nil

Examples:

B

A

B

s

4 4

El

V /

CB

D

C

B

4

B

aJUKI

\

I

TTl

Ul

I

nc

il/O

t t

StepA,for4stitches

Indicator

since

the

shows

0 (zero) is

actual

numberis9.

10,

however,

takentobe

1,

Test

program

Tl\

u

t

Test program

StepAcheck

n 3

U D

EZE

400

s.p.m.-step speed

control

knob

t

check

-

39

-

Synchro test program(using

SC-320

panel)

Whenthis function is used, the control box indicator section is used and indications are output from the

synchronizer. This test checks whether

tachometer

signal

are beinginput correctly(duringtesting the

the

upper/lower position detection signal and rotation detection

sewing

machinewillnot run; this is not a

malfunction).

Upper

1 :

detected

0 :

not

detection

detected

Lower

n

u

detection

n

u

Tacho

1 0

generator

Fig.

4-10

Test

771

u

program

indication

In

u u

Whenthe upper position is detected by turning the pulley by hand, the step A indicator switches from 0 to 1.

Whiledetection continues it keeps indicating 1. If the pulley is turned farther by hand and the position is no

longer detected, the indicator switches back from 1 to 0. The lower position detection can be checked in a

similarmanner by using the step B indicator section.

If the pulleyturning is

speeded

up slightly and continued,the step D indicator

change

from0 to 1 and 1 to 0

in succession. This is because pulses are generated by the generator incorporated into the pulley. This

repeated changingofthe indication confirms that the rotation detection signal is being

output

normally.

(9) Reversestitching solenoid timing correction

In automatic reverse stitching, if the fon\'ard and reversestitches are not properly aligned this function will

correct for this by changing the

reverse

feedsolenoidON/OFF timing(this is only effectivewhen there are

at least 3 stitches in each step).

When

the stitches are off due to such

causesaschange

of automatic

reverse

stitchingspeed or

change

use this function to make the necessary adjustment.

of head,

* Automatic start reverse stitching solenoid ON timing correction

ACTA

ON

ON ON

OFF

ON

Note)

The

mechanical

Make

the correction asin

(HOSA 1).

Table

HOSAO

OFF

ONorOFF

OFF

ON

solenoidisactuated

operation.

4-11

HOSA

OFF

ONorOFF

ON ON

one

Table

4-11

using

a combination of

Correction

1

- 1

-0.5 0

0.5

1

Fig. 4-11

stitch

beforetoproduceatime

delay

SW6-5

between

(ACTA),

SW4-5

(HOSA

0) and

* Assuming the point, which

is

one

stitch

before,

zero,

made

after

the

correction

one

that

electrical

stitch

zero.

signal

can

before

and

SW4-6

as

be

or

the

-

40

-

Example1) Withthe settingin Fig.

44,

stitchingwillnot be done in the

reverse

direction.

b)

(>

> <

" I

"/

II

\t

c

(

\l

<

r

Fjg.

4-12

If situation a), b) or c) above occurs, reset so that the reverse feed solenoid will be actuated faster (—

direction).

Example 2) With the setting in Fig.

C)

t

' b) The

' I

J

1

44

stitching is

a) The pitch is too small in

the

first

stitchinthe

reverse

point

c) There is one stitch

manyinthe direction. _

not

a) The pitch is

forward

b) The needle enters

c) There is one stitch too many in the reverse

direction.

needle

enters

one

twice.

too

forward

done in the forward direction.

too

small on the

direction.

the

same

—

point

These

situations

occur

when

backstitching speed

is

increased.

4th

stitchinthe

twice.

can

the

Fig.

4-13

Situations a), b) and c) can occur when the reversestitching speed is too slow. In such a case reset

so

that

the reverse feed solenoid will be actuated later (+ direction).

-

41

-

o Automatic start reversestitching solenoid OFF timing correction

Make

the

necessary

SW4-8(HOSB 1).

conectionasin

Table

4-12

Table

4-12

usingacombinationofSW6-6

(ACT

B),SW4-7

(HOSB0)and

ACTB

ON

OFF

ON ON

Example

o

1/

I

a)

,/

HOSBO

OFF

ON

ONorOFF

OFF ON

1)

j)

S

With

the settingin

b)

o

'

fl

ll\

<

/

<

r

HOSB

1

OFF

ONorOFF

ON

) <

Correction

-1

-0.5

0

0.5

1

Fig.

4-4 there are too fewstitchesin the

c)

>

»

• J > c) There is one stitch too few

(

/

<

/

a) The pitch of the last stitch

is

too

short.

b) The needleenters the same

point

twice.

in the reverse stitching

(one is carried over

the free sewing). _

reverse

into

Fig.

4-14

direction.

-

These

situations

occur

when

reverse stitching speed is

too

can

the

slow.

Example

a)

j <

T J

f

7

1/

Fig.

4-15

In sucha case,reset so that the

2)

With

the

settingsinFig.44there

b)

c)

c

f n

<

\

if

<

Fig.

In

suchacase,

4-16

reset

\

<

1

<

sothat the

reverse

9

reverse

feedsolenoidgoesOFF later (+direction).

are

too

many

stitches

a) The pitch is too short in the

first

stitchofthe

sewing.

b) The needle enters the same

point twice at the end the reverse stitching.

c) The first stitch of the free

sewing is sewn in the

reverse

direction.

feed

solenoid

goes

inthe

reverse

free

of

OFF

earlier(—direction).

direction.

-These occur

reverse stitching

speed is

situations

when

too

can

the

fast.

-

42

-

p Automatic terminal reverse stitching solenoid OFF timing correction

Make

this correctionasshownin

Table

4-13

using

a combination of

SW6-2(HOSD 1).

Table

4-13

SW6-7

(ACT

D),SW6-1

(HOSD

0) and

ACTD

ON ON OFF

ON

Example1)

a)

HOSDO

OFF

ON

ONorOFF

OFF

ON

HOSDl

OFF

ONofOFF

ON ON

With

the setting in Fig.4-4, there are too manystitches in the

b)

Correction

-1

-0.5

0

0.5

1

c)

a) The

stitchistoo

pitchofthe first forward

b) The needle enters the same

point

twice at

from

forwardtoreverse.

c) There are

in

the

too

reverse

short.

the

change

many stitches

direction.

Fig.

reverse

4-17

direction.

-

These

situation

occur

when

reverse stitching

speed is

too

can

the

fast.

Fig.

4-18

In such a case reset so that the reverse feed solenoid goes OFF sooner(-direction).

Example 2) With the setting in Fig. 4-4 there are too few stitches in the reverse direction.

a) The pitchofthe last stitch

in

the

Fig.

4-19

reverse

too

short.

b) The needle enters the

same

point

change from forward to

reverse.

c) There are

in

the

Insuch a casereset so that the

too

forward

direction

twiceatthe

many

stitches

direction.

is

-

These occur

reverse stitching

speedistoo

reverse

OFF later (+ direction).

situations

when

can

the

slow.

feed solenoidgoes

Note) Since the automatic terminal reverse stitching solenoid ON timing is such that actuation is done

from low speed, and on a command from free sewing, corrections are

43

-

not

made.

4-3. Increaseofcontrol

panel functions

The numberoffunctions can be increased by changing the control box. Dependingon the typeofcontrol box, the

functions given in Table 4-14 are available.

Table

4-14

Control

No

SC-120

SC-220

SC-320

The

SC-120, SC-220

are shown in Fig. 4-20.

box

and

box

SC-320

Model

SC-20

SC-120

SC-220

SC-320

control

Principal functions

Thread trimming, wiper, reverse stitching

Thread trimming, wiper, reverse stitching, SET, EBT

Thread trimming, wiper, reverse stitching, SET, EET,

pattern sewing, overlap sewing Thread trimming, wiper, reverse stitching, SET, EET,

pattem sewing(programmed), overlap sewing

boxes

SC-120

UUKI

(U

•

SC-220

SC-320

mm

OOOD

00DD

Fig.

• fD

El

fO-DBS

§0

4-20

0

C.9Z"

>C

-

44

-

1) How to remove the control box

(l)

Remove

box O in Fig.

@

Remove

the

the 2

screws

screw

PSC

box, and open front cover O .

O on control

4-21

with a screwdriver.

® in

the

front

cover

•JUKI

Fig. 4-21

of

Remove

which

(SC-120/-220)

on main circuit board 0 Then, remove

cable ©ofthe

bush

the hole in

route,

connector

has

been

O.

Finally,pull out the cablethrough

the

and

remove

0

of

the

connected

or the J61

control

table according to

the

to

(SC-320)

box

control

the

from

control

J60

the

box.

box

mounted

rubber

wiring

Fig.

a

4-22

Fig.

4-23

45

-

2) Control box mounting

(1)

Place

the newcontrolbox in the correctbox mountingpositionon the top surfaceof

head and mount it with the 2 accessory screws(Fig. 4-21).

(2) Bringthe cord to the PSCbox position alongthe wiring route in Fig. 4-23.

(3) Openthe

(SC-20

(4) Finally, connectthe cord to the type of rubber

[so

to complete the mounting.

The position specifiedfor the rubber bushingisshown in

PSC

box front

J67

2P,

that the cord

cover.

SC-120•SC-220

bundling

band

Connectthe type of connector

J60

16P,

fits

SC-320

inside

the

J61

bushing

rubber

20P.)

specified

bushing

Fig.

specified

for the type of box

(inside

4-24.

sewing

machine

for the type of box beingmounted

being

mounted.

thebox)], and

close

thefront

cover

4-4.

Safety

The SC-20,SC-120,SC-220and

circuit operation and resetting.

circuit

SC-320

SC-20

SC-120

220

I < 1

O Q O

Fig. 4-24 shows the connections for the SC-20.

Fig.

4-24

allhave safety circuits such as the following. Here we explain their functions,

1) Sewingmachine lock safety circuit

< Purpose >

If the sewing machine should lock in place due to some mechanical or electrical malfunction

orifit idles due to the V-belt coming loose, after 2 seconds (0.1 second in caseofa sudden

sewingmachine lock) power to the motor and pedal input are shut

< Circuit

< Resetting >

operation

from burn

All input and

run. Manualreversestitching alsobecomes inoperative as does the

Turn the power switch OFF, remove the cause of the sewingmachine stopping and

power

>

back

out

and reduce damage to the sewingmachine to a minimum.

output

ON.

off

to protect the motor

is prohibited. Even if the pedal is depressed the sewing machine will not

reverse

feed solenoid.

tum

the

-

46

-

2) Synchronizer malfunction safety circuit

< Purpose >

When

the synchronizer that detects the

needlestopping position becomesindeterminate (it stops anywhere) or it failsto stop and keeps running, the thread trimming mechanismcould be damaged,which would make the

sewing machine unusable.

To prevent this, the microprocessor constantly checks the synchronizer up and down signals. If an abnormality occurs in the signals the sewingmachine continues to work its motor

functioning as a clutch motor without thread trimming.

< Circuit operation >

If an abnormality isdetected during sewingmachine operation, even if the pedal is depressed the sewingmachine stops. After that, when the pedal is returned to neutral and depressed

againthe unit works asa clutch motor, so

motor without thread trimming or automatic reversestitching (reversestitching by the manual

switch and presser foot lifting by the knee switch can be done).

< Resetting >

Turn the power switch OFF, replace or repair the synchronizer and turn the power switch

back

ON.

<

Error

indication

>

In the case of the SC-320, when the sewingmachine locks or the synchronizer malfunctions

an indication appears on the control

needle

position(up or down)malfunctions, orif the

sewing

can be done with it operating as a clutch

box

as shown in Fig. 4-25.

(1)

When

the sewingmachine locksor the detector malfunctions the nature of the trouble can be determined

from

the

control panel indicators.

Detector

Sewing machine lock

malfunction

c c

L

c

O

n

1

(2) A panel error can be identified from the control panel indicators (when a panel error is indicated, turn the

power switch OFF and back ON).

Panel

error

E

n

u

n

Fig.

4-25

(3) Every time a control panel switch is turned ON a beep sound is produced for confirmation (if an inoperative

switch is pressed no sound is produced).

(4) If the pedal is depressed and the sewing machine fails to operate, a beep sound is produced. Example : if all

steps have

not

been

set in a programmed sewing pattern.

3) Thread trimming in progress/completed safety circuit

If the pedal is depressed while terminal reversestitching or thread trimming is in progress,after the sewing

machine

< Resetting> Return the pedalto neutral, then

hascompleted thread

normal operation.

trimmingitremains

-

stoppedto

prevent

depressitagain

47

-

needle

and the

breakage

sewing

machine

or blade

will

damage.

return to

4) If power isturned ON while pedal is depressed

If the power switch is turned ON while the pedal is depressed, if the needle is down it goes to the up position,

if up it just stays there. Operation is the same as when the pedal is in neutral.

< Resetting > Return the pedal to neutral, then depress it again and the sewing machine will return to

normal

operation

5) Reverse feed solenoid safety circuit

If the manual reversestitching switch is held ON continuously for 12 seconds or more, power to the reverse feed solenoid is shut off, except that automatic start and finish reversestitching proceed normally even while this safety circuit is operating. If thread trimming takes place while this switch is held ONcontinuously, power

to

the

reverse

feed

solenoidisshut

<Resetting> Turning the

off.

manual

reverse

stitching

switch

OFF

releases

the safety circuit.

6) Auto-lifter safety circuit

After the thread is trimmed, the

1minute, the

However,

and

FLPWare ON it stays up.

power

to the

asdiscussed in the explanation of dip switches FLONand

< Resetting > After the presser foot is

presser

foot

foot is

raised

by the automatic

lifting

solenoidisautomatically

lowered

the

system

lifting

function,but if it staysup for

shutoffandthe

FLPW

on Item 4-2-3)-(7), when both FLON

presser

foot is

returnsto the initialcondition,and the

presser

foot can be raised at any time by thread trimming or the knee switch.

7) Needle position detector loose connector safety circuit

If this needle position detector connector becomes disconnected

and then the power is turned ON, the

motor

will not operate.

< Resetting > Turn the power OFF, plug the connector in

correctly as shown in Fig. 4-26 and turn the

power

back

ON.

Needle

position

detector

lowered.

connector

4-5. Connectors for standing work

On

the

SC20,

SC-120,

in standing work are on the front after PSC box as standard equipment. When the pedal switch is connected to the pins of these connectors and turned ON, the following operations

are

carried

out.

1) Connector O Auto-lifter (operative only for a

machine with an automatic presser foot lifting function)

2) Connector Q for actuating the thread trimmer

(valid after low-speed or high-speed sewing operation)

3) Connector @ for high-speed sewing operation (the sewing speed in this case is determined by the 40U

spm

step

speed

by the conventionalmaximum speed adjustment

0 ).

4) Connector O for low-speedsewing

SC-220

control

and

SC-320,4

dial

0 , it cannot be

connectors

changed

dial

for

use

Fig.

oJlQflCSD.

4-26

•

ED

Note)

Automatic presser fool lifting operation (when

connector

O

switchis

turned

ON)

is as .le<ic!ibed

in 4-2-3)-(7) Lxplanation of dip switch FLON

(SW5-1) and FLPW (SW5-2). This

summarized

in

Table

4-15

below.

operation

is

Fig.

4-27

Table

4-15

FLON

(SWS-l)

ON

FLPW

(SW5-2)

OFF

Control

When

connector

O switch is

turnedONthe

presser foot is automatically raised;ifthere is

that

no input for 60 seconds after

it is

automatically lowered.

ON

presser

it willbe kept raised for 10 minutes aslong as

there is no

input.

foot

is automatically raised,

After

the

Note) In standing sewingmachine operation, if connector O is used set

FLON (SW-5)to ON.

< Standing work cable > (S134) MAS134000AO

The standing work cable can be connected to the various switches of the different section usingthe adapters in Table 4-16, which can be ordered. (Since one cable is needed for each connector, four cables are needed to connect to four connectors.)

Switch

Symbol

O

o

e

< Wiring to external switches.>

presser

foot

thread trimming switch

Part

male

plug

connector

lifter switch

2?

Fig.

4-28

Table

name

terminal

cover

4-16

Part

number

D6043555B00

HKO17400020

MAT81126T00

Vinyl

wire

(Use

AWG

5V

24 to 18)

high-speed sewing switch

low-speed sewing switch

49

-

5V

4-6. Production

JPS

1

IbiJJ

>8

control

1

0119]

system and needle-up

When

a cableis connected to connector O InFig. 4-30, either the (1)

production control system function or the (2) upper stop function can

be operated. To operate these functions it is necessary to reconnect

the

connectors

These functions are explained below.

1) Production control system

Connect

as shown in Fig. 4-31 (this is how the machine is wired at the time of factory shipment) and also connect connector O to an external

cable to make the production control system usable. When the

wiringis done this way, a signal is output at the timeofthread

trimming.

stop

switch functions

on

the

J58

MANU.Conthe

rearofthe

front

main

cover.

circuit

boardtoconnector

O

Fig.

llOi^l

4-30

I I

CZH

t2-SJ

open

front

cover

connector

control

Fig. 4-31

for

system

connector

main

production

for

upper

circuit

-

J

SSAMANU.C

stop

board

-

2) Upper stop switch

When

connector O in Fig. 4-31 is connected to J64

USW

on the main circuit board, and the special order

upper stop switch is connected to connector O , the needle is stopped in the upper stop position without

thread being trimmed during the sewing operation.

<

Attachment

(T)

Fix

@ Next,fix the

(3) Connectthe

upper

to

table

stop

cable

>

switch

O in

cordin

to connector O in

place

with

with4

the

staples.

Fig.

wood

4-31.

Fig.

4-32

screws

that

come

table

packed

withit.

5.

MAINTENANCE

AND

INSPECTION

5-1. How to replace the sensor

If the

sewing

speed of the machine decreases suddenly or the machine stops whilethe front part of the pedal is

potentiometer

depressed,replaceit because it has reachedend of its Bas shown in Fig.

replace

them

5-1

(a) and (b). However, they are different from each other only in their pedalingsprings,so

the

same way.

(a) Pedal sensor type A

(for AK-30, AK-33)

set

service

life. There are two types of the pedal sensorsA and

(b)

Pedal sensor

(for AK-31,AK-34)

Fig. 5-1

type

B

qDOOCSD.

Fig.

5-2

• a

•

I

Fig.

'6^,

iponi

5-3

1) Remove the front cover setscrew (Fig. 5-2 O ) in the

PSC

box,

and open the front cover.

2) Disconnect the 6P connector of the sensor potentiometer

set (Fig. 5-3 O ) from the main circuit board. (The

locking device is installed in the pushitopenbyhand,

and pull it

connector

out.)

housing, so

3) Remove the FG cordofthe pedal (Fig. 5-3 O ) screwed

on

the

main

frame.

4) Removethe pedal connecting bar (Fig. 5-4 O ) from the

pedal lever (using two spanners for MIO).

5) Remove the four screws attaching the pedal sensor (Fig,

5-4 d ), then remove the pedal sensor set from the

box.

Fig. 5-4

PSC

Fig.

6)

Loosen

the two pedallink

setscrews

(Fig.

5-5

O ) with

an L type hexagon wrench. Then, remove the pedal FG

cord setscrew (Fig. 5-5 O ) and

(Fig.5-5 0 ). (Do not

remove

the pedallink

pedallever O ).

7) Remove the three sensor potentiometer setscrews (Fig. 5-5 O )»then removethe sensor potentiometer set (Fig,

5-5.0).

8) Loosenthe potentiometer link setscrew(Fig. 5-6 O )

of the sensor potentiometer set, then remove the

potentiometer link (Fig. 5-6 0 ).

9) Assemblethe removed potentiometer link on the new

sensor

potentiometer

5-5

O

10) Turn the potentiometer shaft counterclockwise until it

stops, contacting the potentiometer link positioning pin

set.

(Fig. 5-7 O ) to that in the sensor potentiometer mounting position (Fig. 5-7 0 ). Then, tighten the

setscrew at

that

position (tightening torque 8 ~ 10 kgcm).

11) Install the sensor potentiometer set in the pedal sensor

mount

(Fig.

5-5

0 ) with the four

setscrews

(Fig.

5-5

o).

Fig.

5-6

Driver

m

r

(Note: Install it after arranging the lead wires properly

so

that

the

mounting

plate does

not

bulge.

Fig. 5-8 O )

12) Insert the pedal link pin into the potentiometer link slot

to

assemble.

13) Temporarily set the pedal link

and install tlie springs for depressing the front and back

setscrew

(Fig.

5-9

© )

parts of the pedal, (pedal sensors type A: 1, type B: 2).

14) Turn the pedal lever(Fig. 5-9 0 ) in the arrow direction

Fig.

5-7

until it contacts the stopper. Tighten the link setscrew

where the clearancebetween the leverand the potentiometer

link

becomes

2 mm(0.079") and the

axial

looseness

becomes

0.05 ~ 0.1mm(0.002"~ 0.004").

(Note: At this time, check that the pedal leveroperates

easily without looseness.)

1.^)

Finally,

Using

of

the thread trimming and stroke position starting rotation.

O Caution: This part should not bulge.

assemble in

VR6,

VR7 and VR8. adjust the operating positions

the presser foot lifter (pedal sensor type B only) and

0

the

reverse

©

orderofdisassembly.

^2.

Fig.

5-8

-

52

-

Fig.5-9

5-2. Memory battery chargingmonitor LED (SC-320only)

If the sewingmachineis not operated for a longtime, it can

o

Zf n

i-

u

Fig.

5-10

<

For

reference

>

1. Time required to charge.

4 ~ 5 hours (enough for one dayofoperation)

2. Backup

period

Since semiconductors are used, the backup period varies according to the operating conditions.

It

is calculated as follows;

Standard : apprbx. 600 days

Worst case : approx. 6 days

lose charge,and LED 1may light.

When the LED lights, all the patterns in internal memory

are

lost.

If necessary, set the memory again.

However, this does

to

work.

not

cause trouble in sewing, so continue

5-3.

Judging from the above results, the backup should last more than three months in an ordinary location.

Motor

malfunction

detector

LED

The

LEDonthe

main

circuit

board

inside

cover detects overvoltage, overcurrent or low

INALYSIS A

TP3

LSV POV

LV.SWJ57

TP4108

JU6Z

I

A

J58

AMANU.C

M.CTL

voltage applied to the motor in sewing.

of

The explanation

each dectector LED is as

follows;

(I)

LD9O(MTL

3) (ForH company's motor)

Whenthe overcurrent (more than 20A) is

continuouslyappliedto the motor for 100 ms or more, LD9,put the motor in an unenergized

state and then completely stop the motor

within

300

ms.

PI46

Reset the

state by turningthe power switchON

motor

when it is in a operable

Consequently, once the motor islocked,do

not reset it until the power switch is again

turned

ON

evenifthe

solved.

troubles

have

(For N company's motor)

Whenthe defect of signalsfrom the built-in

sewing

speeddetector encoder is detected, light

lightup LD9,put the motor in an unenergized

state and then completely stop the motor within

300

ms.

Reset the motor when it isin an operablestate

by turning the power switch ONagain.

Consequently,once the LD9islit up and the

motor is stopped, do not reset it until the power

switch is again turned ON even if the troubles

have

been

solved.

the

again.

been

front

-

53

-

5-4.

(2)

LDIO©(MTL

.

When

the

supply

2) (ForH

voltage

company's

becomes

motor)

too highor low for themotor condition, lightup

LDIO,

motor controller in an unenergized state and then completely stop the motor within 300 ms. Reset

the motor when the supply voltagebecomes normal valuesat the time

switch back ON. Once die motor is locked, do

Rated

voltage

30200~240V

10100~120V

10200~240V

Solenoid

monitor

01

I c

+

LED

J5I

CM

n •« wilar-

P.Vfl

(D f C

Table

Over

300V

150V

300V

5-1

voltage

Min.

not

reset until the power switch is turned ON again.

Low

1) If malfunction of trimming(TRM),wiper presser

(BR), top feed lifting (XL• PC •BT), etc. has

voltage

140V

70V

140V

foot lifting(PL),

Max.

of

next turning the power

reverse

feed(BT), brake

occurred in ordinary operation, troubleshoot according to the followingprocedure.

Fig.

Solenoid

0)

(0

a>

Q. O

O

c

v>

0)

O

5-12

i'

R46

BR I

R47

TL I

o

PC

•

R48

H

BT I

r

R49

TRM I

"• R50

O wp I

•3

R5I

PL

I

RS2

PWR I

LED

Does

not

Dark

Bright

light

JS9

LOS

L06

I

JZL

R53

I R

• 54

4"

I

R5S

I

RS6

I

R57

I

R58

I

2401'-6

I40l~6

oTl'

Function

Main

circuit

Defective

01

L

I

04

I

05

I

Table

Locationoffailure

selection

boardisdefective.

synchroni2er

5-2

switchisnot

A

-K-

•LOI

,LD2

1X3

.LD3

CtD

,L04

Sl3

•

E(3

•

• LOT

Incorrect wiring system (imperfect

out

and

disconnectionofJ52

Power

circuit

boardisdefective.

boardisnot

set.

Transistor

defective (imperfect contact, breakage).

Defective

imperfect

Defective

(coming

J49

contact,

solenoid

circuit

out,

(12P)

connector

disconnection)

J41

imperfect

connector

(1) After turning the power

"OFF",

PSC front cover setscrew and

(2) Then, turn the power "ON", check the solenoid

operation and the maincircuit board LED

brightness and find the failure.

connector)

circuit

contact,

set

(PL,

WP),

contact,

Transistor

board

is

(coming

out,

power

board

disconnection)

coming

circuit

Checking

Check

Replace

Reinsert

check

Replaceoradd

Use

another

board.

Reinsert

check

Measure

BR

OFF)

method

with

the

board.

the

synchronizer

connector

conduction.

transistor

connector

conduction.

resistance.

LEDON(BR

put the

loosen the

open

manual

and

the

board.

and

solenoid

(WP),

the cover.

Use

Does

not

.c

O)

a>

(3

0)

Q.

O

t/>

a>

3 C

*-*

C

o

Dark

Bright

light

Transistor

Main

Wiring systemorpower

boardisdefective.

Transistor defective.

Main

circuit

boardisdefective.

circuit

boardisdefective.

circuit

board

is

-

54

-

_

Defects

triplicated

another

board.

Replace

board.

box.

main

transistor

circuit

5-5. How to replace each circuit board

1)

Main

circuit

board

assembly

(1)

Loosen

the

(2)

Then

the

(J51-P.VR

J62-M.CTL

setscrewOon

PSC

box

and

remove

main

the

circuit

0 ,

board.

J52-SOL

J67-SC-20

J60-SC-120-220©,J61-SC-320

J58-MANU.C 0 , J63-FRT.SW 0 ,

J66-MAXVR

(3)

Remove

®

and

from the front cover. / / X

(4)

Mount

the

front

coverinthe

® ) 0 O

the

four

remove

new

main

removal.

(5)

Finally,

as

this, the replacement is

2) Speed limitingcircuit board

(1) Disconnect connector J63-FRT.SW after completing the above procedure l)-(l).

(2) Remove the three circuit board setscrews ® , remove the old speed limitingcircuit board from the

front cover and replace it with a new one.

(3) Finally, assemble the new one in the reverse order to thatofremoval. With this, the replacement is

completed.

adjust

the

prescribedinthe

[M4001301AA0Aj

the

front

remove

connector

main

the

O ,

circuit

the

old

main

circuit

reverse

ordertothat

pedal

stroke

assembly

front

mountedonthe

J55-POWER

® , « O

board

circuit

boardonthe

and

clause.

cover

-f

in

O . \

^ y

Jl

~i

•JDDJflCSQ.

0 , M L \

nmstczn.

^ | ',

, \

\

® , W U

Fig.

®©

Ox

5-13

setscrews

board

of

the

speed

With

[M4301301AAD]

^ o

j

/ ' ' i . i

-t

/

^ J /

|

Tb/

X X

/~/

/ ^

O ®

'—'

1

-

55

-

3) Transistor citcuitboards assembly [M42013010A0]

(1) Push up latch O to open

cover

O andupperrighttransistor

PSC

box top

circuit board cover assembly O .

(2) Next, pull the transistor circuit board

. assembly corresponding to the

location

[BR=

of

the malfunction up and out.

O (onlyin the

caseofCompany

FL= 0 (only in the caseof the machine providedwith an AK),

WP=

0 ,

TRM=

(3) Next, pass a new transistor circuit board

assembly through the slit in

top cover and fit securely supply circuit board A and B assemblies,

the

onto

PSC

power

box

(4) Last, fit transistor circuitboardgroup

protrusion 0 to

guide 0 , close the cover, and lock

the latch to complete the replacement.

PSC

box top cover

H),

O ,

Fig.

5-14

It position at whichthe transistor is to be pushed in,marked by a

supply circuit board inside the opened front cover.

BR brake transistor(onlyin the

FL presser foot lifter transistor

WP wiper transistor

TRiM

BT'PC'TL

BT : backtack (reverse feed) transistor

:

thread

trimmer

: Top feed lifter transistor

transistor

caseofCompany

symbol

H)

on the front riglitpart of the power

-

56

-

4)

Power

supply

circuit

board

assemblyA(Company

[M4101301AAA], assembly B(CompanyN;

H;oneand

sing)e-phase)

three-phase,

[M4101301BAA]

(1)

Remove

(only in the case of the machine provided with an

AK) 0 , J47 (3P) (only in the caseof Company

CompanyN;three-phase)

the

connectors

J49 (12?) O , J48 (4?)

H)® andJ46 (7P)O mountedon the

(2)

Loosen

open the coverof the box and removethe following

connectors.

J61-SC-320,J52-SOL<®' and J24 '(p. (J13 in the caseof Company N) on the

control

screw

circuit

0 in

the

J67-SC-20

board.

coverofthe

, J60-SC-120, -220

andJ55-POWER ®

PSC

box.

box,

®,

Side

viewofthe

PSC

Fig.

0 # 0

Fig.

box

5-15

5-16

(3) Then remove FG screw

circuit board A/B asm.

(4) Now,

remove

four

(M4X16) and two

cover

pack

Then remove the power pack cover and coimector

J1 (D , J5 (J4 in the caseof Company N)

and Then,

(5)

pedal sensor.

(6) Loosen four couplingscrews (M5 x 14) in

the

motor

motor.

0 on thesidefaceof the

0 .

remove

box,

pedal

and

®

(CompanyH)®

\

(D

aODOD

'0'inthe

screws,

i.e.,two

screws

J5

0 (M4x 32) in power

coupling

remove the PSC

rod

^

power

screws

PSC

0

from

box

supply

O

box.

the

from

1

the

®

(Company

Fig.

5-17

-

57

-

N)

Power pack cover for U.S.A.

Ground

wire

For

single-phase

0

0®

box

Ground

wire

For

3-phase

box

Fig.

5-18

Pass

powercord O from the power

block 0 inside the cover.

(Precaution) Besuretoconnect

to

the

terminal with ground mark 0 .

screws

switch

through

it to terminal

the

ground wire

m

(7)

Remove

loosen

coverof the

remove screw 0 in

(8)

Then,

Company

and0.Now

PSC

circuit

(9)

Loosen

(M4X45)

board asm. A/B, remove the circuit board and

replace

remove

(10)

Then

the procedure for

reverse

all

the

0

four

and

remove

box

board

five

transistor

screws

two

screws

PSC

box. At this time, never

J2 0 (J3inthe

N)and

relay

remove

together

with

from

screws

©'inthe

circuit

(M4

x 8,

toothed

(M3x8)

the

0 in

transformer.

connectors 0 , 0

thetop

the

main

(M4

x 8) 0 anda

power

cover

power

frame.

supply

it with a newone. At this time,do not

screw

reassemble

0 in.theheat radiator board.

the

components

disassembling

order.

This

completes

the

of the powersupplycircuitboard

boards,

and

screws)

the

case

of

ofthe

supply

screw

circuit

following

themin the

replacement

asm.

top

Fig.

5-19

-

58

-

5) Power circuit board asm.A

Power

circuit

board

asm.

Power

circuit

board

asm.

(CompanyH,3-phase,

(Company N,

(CompanyH,sin^e-phase,

B

(Company N,

(CompanyH, sin^e-phase,200 to 240V)

C

3-phase,

single-phase,

200to 240V)

200 to 240 V)

100to

100to 120V)

120V)

[M7201301ABA]

[M7601301ABA]

[M7201301BBA] [M7601301BBA]

[M7201301CB0 ]

(1) Followthe steps

(2) CompanyH

Remove

RemoveJ4 (6P) from the power circuit board. RemoveJ21 (3P) from the ACservo control circuit board.

J5(

Loosentwo

new

five

one.

Loosen

a

Then reassemble the components following the procedure for disassembling them in the

order. This completes the replacement of the power circuit board asm.

Power circuit

asm.

A/B/C

board

same

as(1) through(8) of

5-5

4).

0 in Fig. 5-17)and J1 ( 0 in Fig.5-17)from the mainframe.

screws

(M5x 10) O , and

screws

(M4x 8) O in the circuit board,

remove

the rectifierfrom the mainframe.

remove

(Company N, single-phase,

the circuitboard and replaceit with

AC

servo

control

circuit

100to120

board

reverse

V only)

(3) CompanyN

(D

Remove

RemoveJ2 (3P) from the power circuit board.

(3)

Remove

(2)

Loosen

(5)

Follow

6)

AC

servo

J4(

(DinFig.

J11 (3P) fromtheACservo

screw

(M5x10)

the

steps

sameassteps

control

circuit

board

Company N

nmma

Fig.

5-21

5-17)

from

the

controlcircuitboard.

O or

screw

(M4x16)

0

and

assemblyB[

CompanyNM75013010B0

Fig.

5-20

main

frame.

0 of(2).

-

0 ,

and

remove

the

rectifier

from

the

main

frame.

^

(1)

Loosen

front surface, and open the front cover.

(2) There are two types of ACservocontrol circuit

board assembly B, depending on the motor, as

shown in Fig. 5-21 and 5-22.

(3) Disconnect allofthe connectors. Since the

connectors have locks, to remove first unlock,

then pull out.

59

-

the

front cover setscrews on the PSC

CompanyH

J21

oOitooW

oo«oo«oO()r~lQ5I>1

-i

(4) Next, remove the 4 circuit board setscrews

(Fig.

5-20

O )

(M4

X8) and

board by a new one.

replace

the circuit

(5) Complete the replacement by reassembling in the

reverse orderofdisassembly.

J24

Fig.

5-22

7) Powerpack (Company H,sin^e-phase/3-phase)

J25

[M73013010B0]

(CompanyN, angle-phase, 100 to 120 V) [M7701301BB0] (CompanyN, 3-phase,200 to 240 V)

[M7701301ABO]

(1) Removethe setscrewsfrom the power pack coveron the sideof the PSCbox, then removethe power

pack cover.

o

W o

olo

OX)

o

o o

o

o/o

o o

oM

e

e 0

Motor

madebyHitachi

Fig.

5-23

Motor

madebyMatsushita

J12—

y>

oaaa

Motor

made

Q 1

1-1

S f.

....l

Motor

madebyMatsushita

Fig.

J

by Hitachi

4-

M

!.«.•

rif?.-

5-24

13

M)

''kjl

J11

e

it

nri

'O

)1

J14

(2) Thenloosentwo

packsafetycover O >and

cover.

screws

(M4

x 10) O in power

remove

the safety

(3) Then pull out coimector (J13 and J14 in the case

of

CompanyH, or J11 and

J12

in the case

of

Company N) mountedon the powerpack circuit

board.

(4) Loosenthree

screws

(M4x 8) 0 whichare used

to fix the power pack circuit board on^emain

frame, and draw the power pack from the main

frame toward you.

(5) Removethe connector which is connected to

power circuit board asm. A/B/C and remove the power pack from the PSCbox.

(6) Then install a new power pack followingthe

procedure for removing the old one in the reverse order. This completes the replacementofthe

power pack.

-

60

-

8)

SC-120,

7

SC-220

oDW

panelcircuitboard

assembly

(1)

Remove

(2)

Remove

with washers, then separate the back panel and front panel.

(3) Open the 2 circuitboard

the

panel assembly from the front panel.

(4)

Finally,

J102© (in

circuit board to complete the disassembly.

cord

opening

the 4 M3x 10 tapping

outside,

then

remove

pull

outJlOl O (in

caseofSC-220)

cover O •

screws

pressure

the

SC-120orSC-220

caseofSC-120)

and

0

locks 0 to

remove

the

or

0

SC-120circuit board assembly (M12013020A0)

--0

P

f-aeiKfc-;

'-V

*--12(5

i.-ldO

r-;oi

•:2

''•O

..-o

Q'

^

S£VC

_rtJ

(5) Using a new circuit board, reassemblein the

reverse orderofdisassembly.

n 0 r

SC-220circuit board assembly(M12013030A0)

Ll6^2aioo.oo!^|;^

3X'.—-Jfyczzfi

I.I

^ —

-

aofea

61

-

9)

SC-320

(1)

panel

circuit

Remove

the

circuitboard

J114

I I J113

Q

board

back

panel

assembly

J112

assembly

from

the

front

panelbythe

replacement steps(1) and(2).

SC-320

Jill

same

procedure

(2) How to remove the connectors and membrane

tail

o Remove setscrew O

that

was

usedin8)

SC-120,

from

the

220

circuit

board(separate the indicator panel from

the circuit board.)

o Remove the membrane tail from

hand.

Jill

o Support J112 with the left hand, suppress

the membrane tail with a fingerand remove

the

connectorinthe

diagram.

direction

showninthe

o Hook a fingernail under the locations

shown by O to removeJ113 and J114.

(3) How to insert the connector and membrane

switch

o Placethe indicator panel and circuit board

together with the front cover between

them.

o

Insert

the

J111

tail

section

and index finger as shown in the diagram,

o Insert the

as

o Push one endofthe plug side of J113 and

J114

J112

tail section

for

J111.

in strongly with an index finger, then

withathumb

the

same way

push the other end in (do this twice).

panel

by

Hook a

to pull the connectors out.

thumb

fingernail

under the stepsshown at O

J112

Jill

index

finger

-

62

-

10) Precautionsin insertingand removing connectors

^ J

•

i|d

11

ID

lock

(1)Asshown

assembly

alwaysbe locked after insertion.

When

first, then hold the connector and pull out.

(2) When inserting or removing any connector,

always

connector by its main body.

at left, the

connectors

pulling

these

turn the powerOFF and hold the

main

circuit

J60,J61

connectors

and

out,

board

J62

unlock

should

-

63

-

5-6.

Troubleshooting

1) Whenever trouble occurs, do the following first.

(1) Pullthe plugout of the controlunit connector,then plugit lock in

(2) Checkthe line voltage. Confirmthat it matchesthe valueon the name plate.

(3) Checkthe control unit fuse. If it is necessary to replaceAe fuse, replaceit with the new fuse provided

for this unit, after you haveconfirmed the capacityofthe fuse.

200~

240V

specification

100~I20Vspecif.catio„

(4) A

sewing

machine

Whentrouble occurs,checkthe stageto which operation wasnormal; if it is known at what stagethe

troubleoccured,the

0

Power

0

Pedal

depression

@

Pedal

neutral

0

Pedal

return

0

Steps

relatedtoreverse

withautomatic threadtrimmershouldoperateas

possible

switch

ON

:3A,(8A)~1 ,

:4A.(8A)-r

troublespotsarenarrowed down,

1-1)

1

2-1)

3-1) 4—1)

4-2)

4-3) 4—4)

feed

5—1)

5—2)

Power

lamp

-2)

The needle bar stops in its highest position.

Sewing

The

needle

Threadistrimmed.

The needle bar stops in its highest position.

Wiperoperates. Presserfoot is lifted.

stitching

Automatic

One-touch type

tube

lights

machine

barstopsinits

reverse

fuse

up

operates

feed stitching.

securely.

-.io

0635x31.8

follows.

making

(low

feed stitching.

speed

lowest

troubleshooting

-»•

position.

high

easier.

speed)

(5) If

trouble

If the trouble ison the control box side,all that happensisthat the control of numberof stitches,suchas

in

automatic

SC-220)

automatic

occurs,

reverse

orJ61

thread

firSt

fmd

feed

(SC-320)

trimmer.

out

whether

stitching,

from

the

does

main

the

trouble

not

work,soit is

circuit

board

isonthe

PSC

box

possibletodisconnect

and

use

the

machine

side

oronthe

connector

asa

sewing

control

machine

box

J60

side.

(SC-120,

with

-

64

-

Operation

Power

switch ON

1-1

Power lamp fails to light.

Problem

Whattocheck

Do the pushbutton switches operate normally?

(i)

Unplug the power cord and check the electrical conduction.

^Yes

No.

Repair

pushbutton

switch.

Is

the

input

voltage

(D

PI (blue) inside power pack cover

(Ex)

1

0ll5V~12OV

3 022OV~24OV

Does Vcc appear inside the main circuit board?

@

o

Connectorstobe

disconnection

Power plug PI (blue 4P inside

main

circuit

board

J55

(POWER),

J67

(SC-20),

J60

o\

Ul

J61

(SC-120 ,

(SC-320)

checked

power

SC-220),

pack)

for

Does Vcc appear at

circuit

board?

SC-

SC-120

SC-220

SC-320

correct?

between between

1 and 2

(115V~120V)

1 and, 2, 2 and 3, 3 and 1

Yes

1

Yes

r

the

control

panel

(220V~240V

connectoronthe

main

5VDC

DC5V

DCSV

No

each)

No

Yes

Repair power cord and check for trouble

in

plant

power

supply.

Replace

PSC

box.

No.

Replace PSCbox.

Replace

control

box.

)

Operation

1-2

ON

On

Problem

Needle fails to

position.

A) Sewing

machine

stop

in up

fails to

run.

(T)

Can

the

motor

be

turnedbyhand?

pulley

Yes

Whattocheck

No

Won't

transistor

disconnected.

Monitor

circuit

go

out.

stop

circuit

LED

board

turning

after

board

(BR)onthe

lightsupand

Yes

BR

is

main

won't

No

Replace

ReplaceBRtransistor

motor.

Replace

O

Check

for

unplugged

Synchro

Main

J52

J55

J62

Company

circuit

(SOL),

(POWER),

(M.

H

connector

board

CTL)

P5 (white 4P inside

P23 (white 9P inside power pack)

J21,J22,J23,

(CompanyHcontrol

board)

Company

o

N

(white

4P inside

(white9Pinside

Jll,

J12,J13,J14

(CompanyNcontrol

board)

Belt

has

come

J24

power

loose.

connectors.

power

pack)

circuit

pack)

circuit

Can

the

sewing

©

pulley be

Is

the

©

correct?

Has

(D Isthe

circuit

(Normally,itdoes

input

the

monitor

machine

turned

Yes

r

voltage

Yes

fuse

blown?

No

LED

boardinits

j

Yes

by hand?

(BR)

normal

not

Is the dip switch on the main circuit

board

settothe correct position?

Confirm

dip switches arc

that

the

TESTA,Band

OFF.

light

onthe

state?

up.)

main

P

Yes

No

test

mode

Repair sewing

or

replace.

Check for

plant

power

Replace If

main

replace

The

power

input

plugisdisconnected.

^ Change over the setting of the dip switch.

Repair

motor.

circuit

PSC

box

machine

head,

probleminpower

supply.

fuse. transformerisburned it.

line in

the

power

board

and

plug

or

out,

switchorthe

Operation

B) Sewing

stop.

Problem

machine

won't

(T)

@ Is

High

speedorlow

the

brake

speed?

transistor

Whattocheck

Low

speed

circuit

board

good?

Normal

High

No

mode

speed

Repair

Replace PSC

Replace

box.

brake transistor circuitboard.

correct?

automatic

not

actuated.

Yes

mm

Yes

functions

reverse

Yes

No

Readjust

Replace PSC

brake

gap.

box.

j

(3)Isthe

O

Qieck

for

unplugged

connector

connector.

C)

o\

Stops normal

interval.

and

outside

upper

brake

the stop

(T)

brake

back

however,

gap

mechanism

It

shouldbe0.2~0.3

(0.008"~0.012").

Touch

normally,

feed stitching is

Synchronizer up/down detection

failure

has

been

detected,

safety

circuitrytooperate.

Replace synchronizer.

causing

Operation

Trouble

Whattocheck

Repair

Replace

No

No.

Replace

Adjust pedal spring stiffness (for

depressing front partofpedal), pedal

sensor angle or

Turn

Repeat thread trimming and

No.

power

Replace

2--i

Front

part

of

pedal

depressed

2-2

o\

CO

Sewing machine fails to

operate.

O Cheek for unplugged

J51 (P. VR) on main circuit board

Fails to reach high

O Check for unplugged

connector.

speed.

connector.

^ (D

Doesitoperate

(J)Isthe

(2) Isthe400

max.

correctly? Has the switch been reset after thread trimming?

after

speed

control

s.p.m.-step

pedalisdepressed

Yes

knobonthe

Yes

speed

control

Yes

once?

PSC

knob

box

onthe

set

correctly?

PSC

boxset

PSC

pedal

the

knob

On again.

PSC

pedal

box.

sensor.

VR8

clockwise.

box.

sensor.

(LSW).

turn

Operation

Pedal

in

neutral

Trouble

3-1

Needle failstostopindown

position.

^

Whattocheck

Repair

(T)

A)

Operation

fails to

o\

VO

B) Stop at

than

stop.

position

the

at low

down

\

position.

Ijj.

Ui

V.vi?

speed

other

Doesitstop

is

depressed

(T)Isthe

different

up

position?

stop

after

once?

Yes

position

from

Yes

pedal

the

No

Is

board

(Checkbyreplacing.)

No

Doesitstop then

Can

theBRtransistor

circuit

good?

Yes

temporarily

movetotheupposition?

Yes

r

1

threadbeti

rimmed?

Yes

and

oJ

No

Replace BR

Replace

Pedal spring for depressing

of

pedal is stiff. Adjust pedal sensor

angle or

Nol Replace

No

Replace PSC

Recheck

selection

Replace PSC

transistor

PSC

box.

VR8

control

box.

main

switch.

box.

(LSW).

box.

circuit

board

board.

back

function

part

)

PSC

box.

up/down

detected,

Replace

spring

(TSW).

PSC

box.

Repair

causing

synchronizer.

stiffness.

detection

safety

failure

circuitry

Operation

C)

Thread

it

should

o

Trouble

trimmerisactuated

not.

when

@

Touch

reverse

(T) Isthe

the

spring

back

@Isstroke

back

mechanism

feed

stitchingisnot

pressure

partofthe

adjustment

Whattocheck

functions

ofthe

pedal is depressed adequate?

potentiometer

actuated.

Yes

pedal

Yes

normally,

sensor

applied

adjusted

however,

correctly?

tothe

automatic

pedal

when

No

Replace

Synchronizer

has

been

to

operate.

Increase

Adjust

VR7

Replace

Operation

Trouble

Whattocheck

Repair

4-1

Threadisnot

part

of

pedal

IS

depressed

O Check for unplugged

P49

(12?)

I

-j

4-2

Sewingmachine fails to stop

in up

position.

trimmed.

connector.

CD

@

©

Does

the

thread

Are

the

pedal

correctly

(When

adjusted?

VR7isturned

after the back

actuated.)

Do

the

thread

The

resistance

7.5

Q.

Is a

thread

Confirm

light

that

up.

trimming

stroke

solenoid

Yes

adjustment

counterclockwise"

potentiometers

failtomove?

partofpedal is depressed, thread

Yes

'

r

trimming

between

trimming

the

signal being

monitor

solenoid

P49

resistance

(12P)10and11shouldbeabout

Yes

1

r

output?

LED

(TRM)onthe

Yes

with

(VR7 TSW)

the

pedalinneutral

trimmer

correct?

main

circuit

is

board

No

Adjust or replace moving knife

No.

Adjust

VR7

No.

Replace TRM transistor circuit board.

No.

Replace

the

and

fixed knife.

(TSW).

solenoid.

PSC box.

thread

trimmer

J1

A)

Continuestorunatlow

speed

without

stopping.

(T)Isa

Confirm

)

brake

signal

that

the

being

main

output?

circuit

board

Yes

monitor

LED

(BR)islit.

Replace

the

PSC

No

box.

Replace BR transistor circuit board.

Operation

Trouble

Whattocheck

Repair

4-3

Wiper fails to

O

Check

for

P49

(12P)

to

4-4

Presser

operate

unplugged

foot

failstorise.

connector.

Is the wiper function selection switch (dip switch on main

®

circuit

board)

set

correctly?

Yes

t

Is

the

wiper

switch

©

Is

the

©

®

wiper solenoid resistance correct?

The

resistance

about

8.5

X2.

Is a wiper signal being

Confirm

that

(T)IstheFLswitch

P48

connector

or standing sewing machine

connector

If

on

(When

between1and

the

machine

the

main

turnedcounterclockwise the

ON?

Yes

between

connector

1

P49

pins6and9should

Yes

output?

the

monitor LED (WP)on

the

Yes

good?

1

and

between

2 ~|_

line r

id

2 J

has AK-31, AK-34 specifications, is

circuit

board

set

correctly?

switch

presser

be

main circuit board light up.

ON

-»•

VR6

rises.)

0

(FL

SW)

OFF

foot

No

Reset referring to

selection

Turn

Replace

No

Replace WP transistor circuit

No

Replace

*

Replace

Adjust

switches.

ON.

wiper

PSC

theFLswitch.

VR6

switch;

box.

(FL

the

sectiononfunction

replace

SW)

solenoid.

board.

I

Replace

the

(2) Isthe FL

The

resistance

5.4X2.

solenoid

between

resistance

connector

correct?

P493and4shouldbeabout

solenoid.

(DIsanFLsignal

Confirm

that

being

the

output?

monitor

O Check for unplugged connector.

P48

(4P)

Connector

sewing

(AK30)

for

machine

standing

(2P).

LED

(FL)on

the

maincircuit

board

light up.

Replace

the

PSC

box.

theFLtransistor

circuit

board.

Operation

Trouble

Whattocheck

Repair

Reverse

feed.

UJ

5—1 Fails to

stitching.

A)

Automatic

stitching fails;

type

operate.

perform

reverse feed

AUTO

reverse feed

reverse

one-touch

does

feed

not

(T)Isthe

The

5

Q.

CDIsa

Confirm

reverse

resistance

reverse

that

feed

solenoid

between

feed

the

connector

signal

being

monitor LED (BT)on

resistance

correct?

P497and8shouldbeabout

Yes

output?

the

main circuit board light up.

Yes

No^

No.

Replace solenoid.

Replace

PSC

box

or replace

control

box.

Replace BT transistor circuit board.

ff

o Check for

connector.

P49

unplugged

(12P)

)

control

PSC

Repair

box.

Operation

B)

Automatic fails reverse

Trouble

but

one-touch

feed

reverse

operates.

feed

type

(T)

Does

installed?

automatic

reverse

Whattocheck

feed

still

fail

Yes

ifa

new

control

boxis

No^

Replace

AUTO

O

Check

for unplugged

connector.

Main

circuit

board

J60

(SC-120,

J61

(SC-320)

C)

Automatic

•p».

works

type

operate.

SC-220),

reverse

but

reverse feed fails to

feed

one-touch

(T)Isthe

Connector

reverse

feed

P491to2switch

switch

good?

ON

OFF

Yes

Replace reverse feed switch.

0

No.

Replace

main

circuit

board.

AUTO

5-2

Reverse

feed

stopping.

continues

without

(T)

(2)

Does

the

monitor

replacing

LED

the

transistor

(BT)

onthe

Yes

circuit

Yes

main

board

circuit

correct

board

the

failtolight

problem?

up?

Replace PSC

No.

Replace

No.

ReplaceBTtransistor

PSC

box.

circuit

board.

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5-8. Connectorconnection diagrams

1) SC-20, SC-120, SC-220, SC-320 connector connection diagrams

(1) Box top surface connectors.

: Connector P46 (synchronizer)

: Connector P47 (brake) [Company H only]

: Connector P48 (Auto-lifter)

: ConnectorP49 (solenoid head)

o

Connector

<^o O O

Connector

O O O O

Connector

P47

P48

P49

10.

11.

12.

1.

BR

COM

3.

BR

FL FL FL FL

BT

WP

SW SW

COM

SW

COM

1.

2.

3.

4.

1.

2.

6.

9.

RTN

red

black

white

black

red

green

white black

white

black

solenoid BR about 6.5 , operating voltage 34VDC

o

o!

FL

switch

7

FL

7

solenoid

operating voltage 34VDC

BT

switch

WP

switch,

WP solenoid

about

5.4 ,

8.5 f2 ,

operating voltage 34VDC

7.

BT

8.

BT

COM

TRM

COM

TRM

FG

white black white

black

green/yellow

BT solenoid

about

5.15

operating voltage 34VDC

TRM

solenoid,

about

7.5 12 ,

operating voltage 34VDC

,

80

-

5-9.

Typeofrating plates

for

SC seriesofthe

Applicable models SC-20, SC-120, SC-220, SC-320, SC-522

PSC

unit

A A 4. A As

.J ! L

Destinations

General

North

Europe

Type

SC-

20

SC-120

SC-220

SC320

export

America

Base

color

Black

D

U

V

JUKI

brand

Company

Color

character

White

H

Typeofvoltage for

PSC

box

lOOV

200V

system

10

system

30

system

10

B

A

C

Typeofreatures

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of

1

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SC-328

SC-522

SC-

SC-120

SC-220

SC-320

SC-328

SC-522

3

20

Blue

Company

White

N

1

3

TypeofZ-stand, J-stand or T-stand

and

presser

lifter

Without

55

Presser

V f

nH

Presser lifter using

•0

Without

c

CS

?

Presser lifter using

presser

lifter

presser

using

lifter

knee

pedal

lifter

knee

switch

A

B

C

G

H

-

81

-

switch

SC-20

4i>

MorroR

module

Transistor

board

circuit

panel

SC-120

driver Pre

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BP-l-BP-4

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board

Membrane

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panel

SC-220

82

-

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arcuit

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SC-320

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FL

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J43

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sewing

sensor

edge

detection

Cloth

SW

FL

machine

SW

PDH

VR.SV

USW

comiol

•utamatic

Preductlon

•ynain

ponwrOFF

diagrams

Block

1) Company H Single-phase100 to 120V

5-10.

type

export

Ordinary

power

servo AC

current,

detector

and

voltage

supply

ocsaov

eahW

u.y.M

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EARTH

99 0

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transformer

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and

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selector

voltage

sensor

Pedal

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I

circuit

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board

circuit

panel

switch

Membrane

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sewing

rain

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and

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power

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DCOC

machine

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circuit ponel

board

circuit

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switch

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export

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•JUKI

JUKI

CORPORATION

HEAD

OFRCE

2-1.

8-CHOME.

CHOFU-CITY.

BUSINESS

23-3.

KABUKI-CHO

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CABLE; TELEX:J22967.

PHONE:

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03(3205)1188.1189.1190

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Juki SC-20, SC-120, SC-220, SC-320 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual