High-pitched sound while embroidering
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Needle is turned, bent or the point is dull.
Replace the needle.
Refer to How do I change the needle?
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Pieces of thread are caught in the race.
Clean the race.
Refer to How do I clean the race?
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Upper threading is incorrect.
Check the steps for threading the machine and rethread the machine.
Refer to How do I thread my machine?
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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.
Refer to How do I set the bobbin?
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There are needle holes or friction scratches in the bobbin case.
Replace the bobbin case, or consult your authorized Brother dealer.