Brother DCP-7090 Service Manual page 108

 Error code AF00
Home position is still being detected even after the first side CIS unit was moved.
Step
1 Dust on the CIS guide shaft
2 CIS drive belt coming off
Wrong wiring of the first side CIS
3
flat cable
Connection failure of the FB
4
motor harness
Connection failure of the first
5
side CIS flat cable
6 Damaged first side CIS flat cable
7 First side CIS unit failure
8 FB motor failure
9 Main PCB failure
 Error code B000
Detected that the first side CIS flat cable or second side CIS flat cable was not inserted
correctly when function code 55 was executed.
Step
Connection failure of the first
1
side CIS flat cable
Connection failure of the second
2
side CIS flat cable
3 Damaged first side CIS flat cable
Damaged second side CIS flat
4
cable
5 First side CIS unit failure
6 Second side CIS unit failure
7 Main PCB failure
Cause
Cause
2-68
Remedy
Remove the dust on the CIS guide shaft.
Reattach the CIS drive belt.
Reattach the first side CIS flat cable.
Reconnect the FB motor harness.
Reconnect the first side CIS flat cable.
Replace the first side CIS flat cable.
Replace the first side CIS unit.
Replace the document scanner unit.
Replace the main PCB ASSY.
Remedy
Reconnect the first side CIS flat cable.
Reconnect the second side CIS flat cable.
Replace the first side CIS flat cable.
Replace the second side CIS flat cable.
Replace the first side CIS unit.
Replace the second side CIS unit.
Replace the main PCB ASSY.
Confidential