76
PFM-4000
Part Number 6Z8303
Troubleshooting
Skipping stitches
Incorrect needle size
Bent or blunt needle
Incorrect position of
needle
Tight upper thread
tension
Light pressure on
presser foot
Use 135 x 7 #24 needle.
Insert new needle.
Reset needle. Set needle with scarf side
facing the back of the machine.
Loosen upper thread tension.
Increase pressure on presser foot.
Puckering
Incorrect thread
tension
Light pressure on
presser foot
Using two different
sizes or types of
thread
Bent or blunt needle
Loose presser foot
Reset thread tension, it may be too tight.
Increase pressure on presser foot.
Upper thread and lower thread should be
the same size and type.
Insert new needle.
Reset the presser foot.
Breaking thread
Stitching too fast
Improper threading
Sharp eye or burr in
needle
Bent or blunt needle
Incorrect type or size
of needle
Thread tangled
around tension
spring
Incorrect tension
Dust and debris in
thread path or in
needle and looper
areas
Looper and needle
timed incorrectly
Worn or damaged
loopers
Stitch at a medium speed.
Check thread path. Re thread machine.
Replace needle.
Replace needle.
Use 135 x 7 #24 needle.
Check thread path. Correct as needed.
Loosen or tighten tension as needed.
Clean thread path. Check needle and
looper areas.
See
for timing
instructions.
Replace loopers.
Skipping stitches
in the corners
Synchronizer
incorrectly set
Adjust the sychronizer. Refer to
information.
Problem
Cause
Solution (continued)