JUKI SC-320 - Thread Trimmer Is Actuated When It Should Not

o
)
Operation
Trouble
What to check
Repair
C) Thread trimmer is actuated when
it should not.
@ Touch back mechanism functions normally, however, automatic
reverse feed stitching is not actuated.
Yes
(T) Isthe spring pressure ofthe pedal sensor applied tothe pedal when
the back part of the pedal is depressed adequate?
Yes
@ Is stroke adjustment potentiometer adjusted correctly?
Yes
No
No
No
Replace PSC box.
Synchronizer up/down detection failure
has been detected, causing safety circuitry
to operate. Replace synchronizer.
Increase spring stiffness.
Adjust VR7 (TSW).
Replace PSC box.
From the library of: Superior Sewing Machine & Supply LLC