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APPENDIX
Symptom
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 incorrectly
is incorrect.
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
and needle is not correct.
The fabric is
wrinkled.
The needle is bent or blunt.
If thin fabrics are being sewn, the
stitch is too long.
The thread tension is incorrect.
The upper thread was not threaded
correctly.
The combination of fabric, thread
and needle is not correct.
Stitches are
skipped.
The needle is bent or blunt.
The needle is incorrectly installed.
Dust has accumulated under the
needle plate or in the bobbin case.
162
Probable Cause
Remedy
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.
Correct the upper threading.
Select a thread and needle that
are appropriate for the type of
fabric being sewn.
Replace the needle.
Correctly install the needle.
Remove the needle plate cover
and clean the race.
Reference
page 28
page 26
page 38
page 43
page 57
page 22
page 26,
page 28
page 28
page 38
page 39
page 60
page 57
page 28
page 38
page 39
page 39
page 149
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