Buzzer Does Not Sound - Brother XR9000 Service Manual

Failure Investigation
for Electronic Parts
When the power supply PCB assy.
connector (CN201) is disconnected,
are the voltages between pins 2 & 3
and 4 & 3 normal?
• Between pins 2 & 3 : 5V DC
• Between pins 4 & 3 : 30V DC
Is the resistance between the pins
1 & 1, 2 & 2, 3 & 3, 4 & 4 and 5 & 5
at the power lead wire assy. 1Ω or
less?
5 - 16

Buzzer does not sound

When the power is turned on or
the pattern is selected, the buzzer
does not sound.
Y
Y
Replace the main PCB assy.
N
Replace the power supply
PCB assy.
N
Replace the power lead wire assy.