Brother International HL-1070 Service Manual - Page 89
BD failure, Scanner failure, PCB 24 Volts DC?
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M-8 BD failure Possible cause Harness connection failure Step 1 Check Is connector P4 on the driver PCB secured correctly? Result Remedy No Connect it securely. M-9 Scanner failure Possible cause Harness connection failure Power supply input Step Check 1 Is the connection of the scanner motor connector P2 on the driver PCB secured? 2 Is the voltage between pins 1 (+24VDC) and 2 (GND) of connector P2 on the driver PCB 24 Volts DC? 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 lowvoltage power supply PCB. Yes Replace the scanner unit. IV-25
IV-25
M-8
BD failure
Possible cause
Step
Check
Result
Remedy
Harness
connection
failure
1
Is connector P4 on the driver
PCB secured correctly?
No
Connect it securely.
M-9
Scanner failure
Possible cause
Step
Check
Result
Remedy
Harness
connection
failure
1
Is the connection of the
scanner motor connector P2
on the driver PCB secured?
No
Reconnect the connectors
securely.
Power supply
input
2
Is the voltage between pins 1
(+24VDC) and 2 (GND) of
connector P2 on the driver
PCB 24 Volts DC?
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.