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Brother NV-10A Service Manual Page 169

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Failure Investigation for Electronic Parts Main motor does not turn
Is the FFC of the operation PCB
assy. correctly connected to CN4 of
the main PCB assy.?
Are the resistance values for the
Stop/Start switch, reverse switch,
raise needle switch and the thread
cut switch normal?
• Switch resistance values
Is the presser foot lifter shaft down?
Is the PF switch assy. resistance
normal?
• PF switch assy. resistance
Is the main PCB assy. attached to the
correct position of the shutter cover?
Replace the operation PCB assy.
Replace the main PCB assy.
Replace the power supply PCB
assy.
From previous page
Y
1 Ω or less
Switch pressed ...
Switch released ...
Y
Y
1 Ω or less
Switch pressed ...
Switch released ...
Y
Y
or
or
N
Reconnect it correctly
N
Replace the SS-VR PCB assy.
N
Lower the presser foot lifter.
N
Replace the PF switch assy.
Attach the main PCB assy. to
N
the correct position of the
shutter cover
5 - 7

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