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Symptom
The upper thread
breaks.
The lower thread is
tangled or breaks.
Probable Cause
The upper thread was not threaded
correctly (for example, the spool is
not installed correctly, the spool cap
is too big for the spool being used, or
the thread has come out of the
needle bar thread guide).
There are knots or tangles in the
thread.
The selected needle is not
appropriate for the thread being
used.
The upper thread tension is too tight. Loosen the upper thread tension.
The thread is tangled, for example, in
the bobbin case.
The needle is bent or blunt.
The needle is incorrectly installed.
The area around the hole in the
needle plate is scratched, or has a
burr on it.
The area around the hole in the
presser foot is scratched, or has a
burr on it.
The bobbin case is scratched, or has
a burr on it.
A bobbin designed specifically for
this machine is not used.
The bobbin thread is incorrectly
installed.
The bobbin is scratched or does not
rotate smoothly, or has a burr on it.
The thread is tangled.
A bobbin designed specifically for
this machine is not used.
Remedy
Correct the upper threading.
Remove any knots or tangles.
Select a needle that is appropriate
for the type of thread being used.
Remove the tangle thread. If the
thread is tangled in the bobbin
case, clean the race.
Replace the needle.
Correctly install the needle.
Replace the needle plate. Contact
your retailer or the nearest
authorized service center.
Replace the presser foot. Contact
your retailer or the nearest
authorized service center.
Replace the bobbin case. Contact
your retailer or the nearest
authorized service center.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
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.
Troubleshooting 141
Reference
page 26
–
page 36
page 55
page 138
page 37
4
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–
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page 20
page 24
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page 138
page 20
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