Failure Investigation
for Electronic Parts
Bobbin thread cannot be
wound on the bobbin.
Is the bobbin winder assy. attached
correctly?
Is the main PCB assy. attached
correctly?
(Is the BW switch OFF?)
Replace the main PCB assy.
Bobbin thread cannot be wound on the bobbin
Y
Y
N
Attach the bobbin winder
assy. correctly.
N
Attach the main PCB assy.
correctly.
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