JUKI SC-20 User Manual

4) If power is turned 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 reverse stitching 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 ON continuously, power
to the reverse feed solenoid is shut off.
<Resetting> Turning the manual reverse stitching switch OFF releases the safetycircuit.
6) Auto-lifter safety circuit
After the thread is trimmed, the presser foot is raised by the automatic lifting function,but if it staysup for
1minute, the power to the presser foot lifting solenoid is automatically shut offand the presser foot is lowered.
However, asdiscussed in the explanation of dip switches FLONand FLPW on Item 4-2-3)-(7), when both FLON
and FLPW are ON it stays up.
< Resetting > Afterthe presser foot is lowered the system 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.
4-5. Connectors for standing work
On the SC20, SC-120, SC-220 and SC-320,4 connectors for use
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 control dial 0 , it cannot be changed
by the conventional maximum speed adjustment dial
0 ).
4) Connector O for low-speedsewing
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 operation is
summarized in Table 4-15 below.
Needle position detector connector
Fig. 4-26
oJlQflCSD.
• ED
Fig. 4-27
From the library of: Superior Sewing Machine & Supply LLC

JUKI SC-20 Specifications

General

Brand	JUKI
Model	SC-20
Category	Sewing Machine
Language	English