Brother HL-820 Service Manual page 92

M-8 Scanner failure
Possible cause Step
Harness 1
connection
failure
Power supply 2
input
Check
Is the connection of the
scanner motor connector P5
on the panel sensor PCB
secured?
Is the voltage between pins 1
(+24VDC) and 2 (GND) of
connector P5 on the panel
sensor PCB 24VDC?
IV-25
Result Remedy
No Reconnect the connectors
securely.
No Check if +24VDC is supplied
between pins 1 (+24VDC) and
4 (+24VRET) of connector P8
on the panel sensor PCB. If
not, check the power supply
output on the low-voltage
power supply PCB.
Yes Replace the scanner unit.