12-9
Error Type
Cause
①
Excessive thread tension
②
Excessive pressure of
presser foot
③
Needle failure -
worn out/damaged needle
tip
needle is too large for
thread
④
Needle hole is too large for
needle
①
Short-circuit of trimming
fuse
②
Poor connection/quality of
trimming solenoid
③
Bad connection
④
Trimming driver TR
damaged
Inspection & Repair
Adjust tension
Change presser foot spring
Change needle
Use adequate size of needle
Check and change fuse F1 in
joint board
Check and change solenoid and
solenoid connection
Check connection
Change joint board
Ref. 5-10, 5-6) 2)
Ref. 5-12, 5-7) 2)
※
SWF/
�
needle holes
are 2.0mm
Check fuse spec
Ref. 9-1, 9-1)
Reference
Puckering
Trimming failure