Brother DCP-9040CN Service Manual page 47

Error code AE
Unable to Scan
See Troubleshooting and routine maintenance chapter in User's Guide.
FB unit home position sensor is not turned on.
Step
1 Scanner unit failure
2 Drive PCB failure
3 Scanner motor failure
4 Main PCB failure
Error code AF
Unable to Scan
See Troubleshooting and routine maintenance chapter in User's Guide.
FB unit home position sensor is not turned off.
Step
1 Scanner unit failure
2 Drive PCB failure
3 Scanner motor failure
4 Main PCB failure
Error code B0
SCANNER ERROR
Harness for scanning is not connected correctly.
* This error is indicated on the LCD in the maintenance mode.
Step
1 Scanner harness not
connected correctly.
2 Scanner harness broken
3 Main PCB failure
Cause
Replace the FB unit.
Replace the drive PCB.
Replace the scanner motor.
Replace the main PCB ASSY.
Cause
Replace the FB unit.
Replace the drive PCB.
Replace the scanner motor.
Replace the main PCB ASSY.
Cause
Reconnect the scanner harness correctly.
Replace the FB unit.
Replace the FFC cable ASSY.
Replace the main PCB ASSY.
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Remedy
Remedy
Remedy
Confidential