SunStar SWF/B Series User Manual page 143

Error Type
Puckering Excessive thread tension
Excessive pressure from
presser foot
Needle failure -
worn out/damaged needle
tip needle is too large for
thread
Needle hole is too large for
needle
Trimming failure Short-circuit of trimming
fuse
Poor connection/quality of
solenoid
Bad connection
Trimming driver TR
damaged
Cause
Adjust tension
Change presser foot spring
Change needle
Use adequate size of needle
Check and change fuse F1, F3 in
joint board
Check and change solenoid and
solenoid connection
Check connection
Change joint board
Inspection & Repair Reference
See 5.5.2, 5.6.2
SWF needle holes are
2.0mm, fit for threads
and needle of the sizes
below:
#50 ~ #70 cotton
#75 ~ #120 rayon
#9 ~ #14 DB K5
Check fuse rating
See 9.1