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Power Does Not Come On - Brother NV-10A Service Manual

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Failure Investigation for Electronic Parts Power does not come on
When the power is turned ON, the
buzzer does not sound
With the power cord plugged into an outlet,
is the voltage between pins 1 & 2 on the
inlet assy. connector 120 (220 – 240) V AC?
Is the voltage between pins 1 & 2 of
CN101 on the power supply PCB assy.
120 (220 – 240) V AC?
Are the voltages between pins 2 & 3 and
pins 3 & 4 of CN5 on the main PCB assy.
normal?
• Pins 2 – 3 ... 5 V DC
• Pins 3 – 4 ... 30 V DC
Does the buzzer sound when the power
is turned ON with the SS-VR PCB assy.
connector disconnected from the main
PCB assy.?
Does the buzzer sound when the power
is turned ON with the operation PCB
assy. connctor disconnected from the
main PCB assy.?
Y
Y
Y
N
N
Replace the main PCB assy.
Replace the inlet assy.
N
or
Replace the power supply code
Reconnect the connector of
the PW SW assy. to CN101 of
N
the power supply PCB assy.
or
Replace the PW SW assy.
Reconnect the connector of the
power lead wire to CN201 of the
power supply PCB assy. and to
N
CN5 of the main PCB aasy.
or
Replace the power supply
PCB assy.
Y
Replace the SS-VR PCB assy.
Y
Replace the operation PCB
assy.
5 - 3

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