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Failure Investigation
for Electronic Parts
Failure Investigation for Electronic Parts
Bobbin winding cannot be done.
Bobbin winding cannot be
done.
Adjust the bobbin winder
assy. for correct assembly
and attachment
Is the bobbin winder mechanism
assembly and attachment normal?
Is the resistance between pins 1-2 on
the BWSW assy. connector normal?
• Bobbin winder shaft in bobbin
winding position ... 1Ω or less
• Bobbin winder shaft in another
position ... ∞
N
N
Replace the BWSW assy.
Replace main PCB assy.
Y
Y
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