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APPENDIX
Symptom
The bobbin thread is incorrectly
installed.
The bobbin is scratched or does
not rotate smoothly, or has a burr
on it.
The lower thread
is tangled or
The thread is tangled.
breaks.
A bobbin designed specifically for
this machine is not used.
The upper thread was not
threaded correctly.
The bobbin thread is incorrectly
installed.
The combination of fabric, thread
and needle is not correct.
The thread tension
The presser foot holder is
is incorrect.
incorrectly installed.
The thread tension is incorrect.
A bobbin designed specifically for
this machine is not used.
The upper thread was not
threaded correctly, or the bobbin
is incorrectly installed.
The spool is incorrectly installed.
The combination of fabric, thread
The fabric is
and needle is not correct.
wrinkled.
The needle is bent or blunt.
If thin fabrics are being sewn, the
stitch is too coarse.
The thread tension is incorrect.
184
Probable Cause
Remedy
Correctly install the bobbin thread.
Replace the bobbin.
Remove the tangled thread and clean
the race.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
Correct the upper threading.
Correctly install the bobbin thread.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
Correctly install the presser foot
holder.
Adjust the tension of the upper
thread.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
Correctly thread the upper thread and
correctly install the bobbin thread.
Correctly install the spool.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
Replace the needle.
Shorten the stitch length or sew with
stabilizer material under the fabric.
Adjust the tension of the upper
thread.
Reference
page 27
–
page 180
page 23
page 29
page 27
page 39
page 44
page 57
page 23
page 27,
page 29
page 29
page 39
page 40
page 57,
page 64
page 57
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