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APPENDIX
Symptom
The thread is
tangled on the
The upper thread was not
wrong side of the
threaded correctly.
fabric.
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
is incorrect.
The presser foot holder is
incorrectly installed.
The thread tension is incorrect.
A bobbin designed specifically for
this machine is not used.
The upper thread is
The bobbin thread is incorrectly
too tight.
installed.
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 coarse.
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. Correctly install the needle.
Dust has accumulated under the
needle plate or in the bobbin case.
174
Probable Cause
Remedy
Correct the upper threading.
Correct the upper threading.
Make sure that the thread is hanged
on the thread guide spring which is
on the left side of the thread guide
cover.
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 install the bobbin thread.
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.
Remove the needle plate cover and
clean the race.
Reference
page 30
page 30,
page 31
page 25
page 37
page 43
page 58
page 20
page 25
page 20,
page 30
page 29
page 37
page 39
page 58,
page 66
page 58
page 30
page 37
page 39
page 39
page 170
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