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Troubleshooting 161
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4
The upper thread
breaks.
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).
Correct the upper threading. page 28
There are knots or tangles in the
thread.
Remove any knots or tangles. –
The selected needle is not
appropriate for the thread being
used.
Select a needle that is appropriate
for the type of thread being used.
page 38
The upper thread tension is too tight. Loosen the upper thread tension. page 57
The thread is tangled, for example, in
the bobbin case.
Remove the tangle thread. If the
thread is tangled in the bobbin
case, clean the race.
page 149
The needle is bent or blunt. Replace the needle.
page 39
The needle is incorrectly installed. Correctly install the needle.
The area around the hole in the
needle plate is scratched, or has a
burr on it.
Replace the needle plate. Contact
your dealer or the nearest
authorized service center.
–
The area around the hole in the
presser foot is scratched, or has a
burr on it.
Replace the presser foot. Contact
your dealer or the nearest
authorized service center.
–
The bobbin case is scratched, or has
a burr on it.
Replace the bobbin case. Contact
your dealer or the nearest
authorized service center.
–
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 22
The lower thread is
tangled or breaks.
The bobbin thread is incorrectly
installed.
Correctly install the bobbin
thread.
page 26
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 149
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 22
Symptom Probable Cause Remedy Reference