Brother HL-730Plus Service Manual page 76

M-7 BD failure
Possible cause Step
Harness 1
connection
failure
M-8 Scanner failure
Possible cause Step
Harness 1
connection
failure
Power supply 2
input
Check
Is the connection of connector P2
on the panel sensor PCB correct?
Check
Is the connection of the scanner
motor connector and connector P3
on the panel sensor PCB correct?
Is the voltage between pins 1 (+24
VDC) and 2 (GND) of connector P3
on the panel sensor PCB measured
24 VDC?


Result Remedy
No Connect it securely.
Result Remedy
No Connect the
connectors securely.
No Check if +24 VDC is
supplied between pins
1 (+24 VDC) and 3
(GND) of connector
P4 on the panel
sensor PCB.
If not, check the power
supply input.
Yes Replace the scanner
unit.