188
APPENDIX — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
The lower thread
is tangled or
breaks.
The bobbin thread is incorrectly
installed. Correctly install the bobbin thread. page 29
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 race. page 184
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 25
The thread tension
is incorrect.
The upper thread was not
threaded correctly. Correct the upper threading. page 31
The bobbin thread is incorrectly
installed. Correctly install the bobbin thread. page 29
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 41
The presser foot holder is
incorrectly installed. Correctly install the presser foot
holder. page 46
The thread tension is incorrect. Adjust the tension of the upper
thread. page 59
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 25
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 29,
page 31
The spool is incorrectly installed. Correctly install the spool. page 31
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 41
The needle is bent or blunt. Replace the needle. page 42
If thin fabrics are being sewn, the
stitch is too coarse. Shorten the stitch length or sew with
stabilizer material under the fabric. page 59,
page 66
The thread tension is incorrect. Adjust the tension of the upper
thread. page 59
Symptom Probable Cause Remedy Reference