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Troubleshooting 189
5
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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.
Use the spool cap that best fits the
size of the spool being used.
page 31
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 39
The upper thread tension is too
tight.
Loosen the upper thread tension. page 62
The thread is tangled, for example,
in the bobbin case.
Remove the tangled thread. If the
thread is tangled in the bobbin case,
clean the race.
page 176
The needle is bent or blunt. Replace the needle.
page 41
The needle is incorrectly installed. Correctly install the needle.
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
Bobbin thread
does not wind
neatly on the
bobbin.
The thread is not passed through
the bobbin-winding thread guide
correctly.
Correctly pass the thread through the
bobbin-winding thread guide.
page 24
Bobbin spins slowly.
Move the sewing speed controller to
the right (so that the speed will be
fast).
page 25
The thread that was pulled out
was not wound onto the bobbin
correctly.
Wind the thread that was pulled off
around the bobbin five or six times
clockwise.
page 25
The lower thread is
tangled or breaks.
The bobbin thread is incorrectly
installed.
Correctly install the bobbin thread. page 27
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 176
Symptom Probable Cause Remedy Reference