Bobbin Winding Cannot Be Done - Brother XR9000 Service Manual

Failure Investigation
for Electronic Parts
Bobbin winding cannot be
done.
Is the bobbin winder assy. attached
correctly?
Is the resistance between the BW-F SW assy.
connector pins 1 & 2 normal?
• Switch depressed
(bobbin winder shaft is right) : 1Ω or less
• Switch out
(bobbin winder shaft is left) : more than 1MΩ
Is the BW-F SW assy. connector
correctly connected to the main
PCB assy. (CN1)?
Replace the main PCB assy.

Bobbin winding cannot be done

Y
Y
Y
N Adjust the bobbin winder
assy. for correct attachment.
N
Replace the BW switch assy.
N
Connect it properly.
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