Brother DCP-8070D Service Manual page 122

■ Error code AD
Scan Unable AD
Remove the original document. Turn the power off, then on again.
DMA transfer error
Step
Scanner module failure
1
2 Main PCB failure
■ Error code AE
Scan Unable AE
See Troubleshooting and routine maintenance chapter in User's
Guide.
Document Scanner home position sensor is not turned on.
<User Check>
• Check that the scanner lock lever is unlocked.
- CCD model
Step
Home position sensor harness not
1
connected correctly
2 Drive PCB failure
3 Belt broken
4 Home position sensor failure
5 Scanner motor failure
6 Tab of CCD module broken
7 Main PCB failure
- CIS model
Step
1 FFC cable not connected correctly Reconnect the FFC cable.
2 Drive PCB failure
3 Document scanner unit failure
4 Main PCB failure
Cause
Cause
Cause
3-31
Remedy
Replace the CCD module. (CCD model)
Replace the document scanner unit.
(CIS model)
Replace the main PCB ASSY.
Remedy
Reconnect the home position sensor
harness.
Replace the drive PCB.
Replace the belt.
Replace the home position sensor.
Replace the scanner motor.
Replace the CCD module.
Replace the main PCB ASSY.
Remedy
Replace the drive PCB.
Replace the document scanner unit.
Replace the main PCB ASSY.
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