Brother DCP-L8400CDN Service Manual page 109

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Error code AD00
Scan Unable
Remove the original document. Turn the power off, then on again.
First side scanned data cannot be output with the required number of pixels, and image
processing cannot be completed successfully.
Step
1 First side CIS unit calibration
data error
2 First side CIS flat cable damaged
3 First side CIS unit failure
4 Main PCB failure
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Error code AF00
Scan Unable AF
Turn the power off and then back on again.
The first side CIS fails to move, remaining at the home position.
Step
1 Dust adhered to guide shaft
2 Coming off of CIS drive belt
3 Wiring failure of first side CIS flat
cable
4 Connection failure of the
document scanner motor
harness
5 First side CIS flat cable damaged
6 First side CIS unit failure
7 Document scanner motor failure
8 Main PCB failure
Cause
Perform
(Refer to
data and setting of CIS scanning area
(Function code 55)" in this
Replace the first side CIS flat cable.
Replace the first side CIS unit.
Replace the main PCB ASSY.
Cause
Remove the dust from the guide shaft.
Re-assemble the CIS drive belt.
Re-assemble the first side CIS flat cable.
Reconnect the document scanner motor
harness.
Replace the first side CIS flat cable.
Replace the first side CIS unit.
Replace the document scanner unit.
Replace the main PCB ASSY.
2-79
Remedy
"Function code 55".
"1.3.19 Acquisition of white level
chapter.)
Remedy
Confidential