Brother International HL-720 Service Manual - Page 76
BD failure, Scanner failure, on the panel sensor PCB measured
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M-7 BD failure Possible cause Harness connection failure Step Check 1 Is the connection of connector P2 on the panel sensor PCB correct? Result Remedy No Connect it securely. M-8 Scanner failure Possible cause Harness connection failure Power supply input Step 1 2 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 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.
M-7
BD failure
Possible cause
Step
Check
Result
Remedy
Harness
connection
failure
1
Is the connection of connector P2
on the panel sensor PCB correct?
No
Connect it securely.
M-8
Scanner failure
Possible cause
Step
Check
Result
Remedy
Harness
connection
failure
1
Is the connection of the scanner
motor connector and connector P3
on the panel sensor PCB correct?
No
Connect the
connectors securely.
Power supply
input
2
Is the voltage between pins 1 (+24
VDC) and 2 (GND) of connector P3
on the panel sensor PCB measured
24 VDC?
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.