Failure Investigation for Electronic Parts Bobbin winding cannot be done
Is the bobbin winder mechanism
assembled and attached correctly?
Is the connector of the BW-F SW assy.
correctly connected to CN1 of the main
Is the resistance between the BW-F
SW assy. connector pins 1 & 2
• Bobbin winder shaft in bobbin wind
• Bobbin winder shaft not in bobbin
5 - 16
Bobbin winding cannot be
position .......... 1 Ω or less
wind position ... ∞
Replace the main PCB assy.
Adjust the bobbin winder
mechanism for correct
assembly and attachment
Reconnect it correctly
Replace BW switch assy.