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Main Motor Rotation Abnormal - Brother NV-10A Service Manual

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Failure Investigation for Electronic Parts Main motor rotation abnormal
• Main motor rotational variance
• Does not reach maximum speed
• Speed cannot be adjusted
Is the connector of the main motor
correctly connected to CN401 of the
power PCB assy.?
Is the power lead wire assy. correctly
connected to CN201 of the power
PCB assy. and to CN5 of the main
PCB assy.?
When the speed control lever is
moved with the power ON, does the
voltage between pins 4 & 5 of CN1
on the SS-VR PCB assy. vary 0.7 –
4.3 V DC?
5 - 8
or
or
Y
Y
Y
Replace the main PCB assy.
or
Replace the power supply PCB
assy.
N
Reconnect it correctly
N
Reconnect it correctly
N
Replace the SS-VR PCB assy.

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