12-9
Error Type Cause
Excessive thread tension
Excessive pressure of
presser foot
Needle failure -
worn out/damaged needle
tip needle is too large for
thread
Needle hole is too large
for needle
Short-circuit of trimming
fuse
Poor connection/quality of
trimming solenoid
Bad connection
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
See 5-7)
SWF/ needle holes
are 2.0mm
Check fuse spec
See 9-1)
Reference
Puckering
Trimming failure
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