Brother HL-1070 - B/W Laser Printer Service Manual page 89

M-8 BD failure
Possible cause Step
Harness 1
connection
failure
M-9 Scanner failure
Possible cause Step
Harness 1
connection
failure
Power supply 2
input
Check
Is connector P4 on the driver
PCB secured correctly?
Check
Is the connection of the
scanner motor connector P2
on the driver PCB secured?
Is the voltage between pins 1
(+24VDC) and 2 (GND) of
connector P2 on the driver
PCB 24 Volts DC?
IV-25
Result Remedy
No Connect it securely.
Result Remedy
No Reconnect the connectors
securely.
No Check if +24VDC is supplied
between pins 4.5 (+24VDC)
and 2.3 (+24VRET) of
connector P13 on the driver
PCB. If not, check the power
supply output on the low-
voltage power supply PCB.
Yes Replace the scanner unit.