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APPENDIX — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
The lower thread
is tangled or
breaks.
The bobbin thread is incorrectly
installed.
Correctly install the bobbin thread. page 19
The bobbin is scratched or does
not rotate smoothly, or has a burr
on it.
Replace the bobbin. –
The thread is tangled.
Remove the tangled thread and clean
the shuttle.
page 146
A bobbin designed specifically for
this machine is not used.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
page 16
The thread tension
is incorrect.
The upper thread was not
threaded correctly.
Correct the upper threading. page 21
The bobbin thread is incorrectly
installed.
Correctly install the bobbin thread. page 19
The combination of fabric, thread
and needle is not correct.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
page 34
The presser foot holder is
incorrectly installed.
Correctly install the presser foot
holder.
page 40
The thread tension is incorrect.
Adjust the tension of the upper
thread.
page 52
A bobbin designed specifically for
this machine is not used.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
page 16
The fabric is
wrinkled.
The upper thread was not
threaded correctly, or the bobbin
is incorrectly installed.
Correctly thread the upper thread and
correctly install the bobbin thread.
page 19,
page 21
The spool is incorrectly installed. Correctly install the spool. page 21
The combination of fabric, thread
and needle is not correct.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
page 34
The needle is bent or blunt. Replace the needle. page 35
If thin fabrics are being sewn, the
stitch is too coarse.
Shorten the stitch length or sew with
stabilizer material under the fabric.
page 55
The thread tension is incorrect.
Adjust the tension of the upper
thread.
page 52
Symptom Probable Cause Remedy Reference