Brother CS5055PRW - Bobbin Thread Cannot be Wound on the Bobbin

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