JUKI SC-20 - Sewing Machine Wont Stop; Stops Outside the Normal Upper Stop Interval

Operation
o\
Problem
B) Sewing machine won't
stop.
O Qieck for unplugged
connector and brake
connector.
C) Stops outside the
normal upper stop
interval.
What to check
(T) High speed or low speed?
Low speed
@ Is the brake transistor circuit board good?
Yes
j
(3) Is the brake gap correct?
It should be 0.2 ~ 0.3 mm
(0.008" ~ 0.012").
Yes
(T) Touch back mechanism functions
normally, however, automatic reverse
feed stitching is not actuated.
Yes
Normal mode
High speed
No
No
No
Repair
Replace PSC box.
Replace PSC box.
Replace brake transistorcircuitboard.
Readjust brake gap.
Replace PSC box.
Replace PSC box.
Synchronizer up/down detection
failure has been detected, causing
safety circuitry to operate.
Replace synchronizer.
From the library of: Superior Sewing Machine & Supply LLC