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Electronic Parts
Failure Investigation for Electronic Parts
Bobbin winding cannot be done.
Bobbin winding cannot be
done.
Adjust the bobbin winder
mechanism for correct
assembly and attachment
Is the bobbin winder mechanism
assembled and attached correctly?
Is the resistance between the bobbin
winder assy. connector pins 1 & 2
normal?
• Bobbin winder shaft in bobbin wind
position ………. 1 Ω or less
• Bobbin winder shaft not in bobbin
wind position … ∞
N
N
Replace BW switch assy.
Y
Y
Replace main F3D PCB assy.
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