JUKI SC-20 User Manual

ON
On
)
Operation
Problem
What to check
Repair
1-2 Needle fails to stop in up
position.
A) Sewing machine fails to run.
O Check for unplugged connectors.
Synchro connector
Main circuit board
J52 (SOL),
J55 (POWER),
J62 (M. CTL)
Company H
P5 (white 4P inside power pack)
P23 (white 9P inside power pack)
J21,J22,J23, J24
(Company H control circuit
board)
Company N
(white 4P inside power pack)
(white 9P inside power pack)
Jll, J12,J13,J14
(Company N control circuit
board)
o Belt has come loose.
(T) Can the motor pulley
be turned by hand?
No
Won't stop turning after BR
transistor circuit board is
disconnected.
Yes
Yes
Monitor LED (BR) on the main
circuit board lights up and won't
go out.
©
Can the sewing machine
pulley be turned by hand?
Yes
r
©
Is the input voltage
correct?
Yes
Has the fuse blown?
No
(D Isthe monitor LED (BR) onthe main
circuit board in its normal state?
(Normally, it does not light up.)
j Yes
Is the dip switch on the main circuit
board set to the correct position?
Confirm that the TESTA, B and P
dip switches arc OFF.
Yes
No
No
Yes
No
test mode
No
No
Replace motor.
Replace BR transistor circuit board and
motor.
Replace PSC box
Repair sewing machine head,
or replace.
Check for problem in power plug or
plant power supply.
Replace fuse.
If main transformer is burned out,
replace it.
The power line in the power switch or the
input plug is disconnected.
^ Change over the setting of the dip switch.
From the library of: Superior Sewing Machine & Supply LLC

JUKI SC-20 Specifications

General

Brand	JUKI
Model	SC-20
Category	Sewing Machine
Language	English