Brother 09055CDN Service Manual page 120

■ Error code AC
Scan Unable
Remove the original document. Turn the power off, then on again.
Scanning failure upon FAX transmission. (Second side)
(Document scanner unit failure for the first time.)
Step
1 Second side scanning CIS
failure
2 Main PCB failure
■ Error code AD
Scan Unable
Remove the original document. Turn the power off, then on again.
Timeout error during waiting for completion of scanning DMA transfer.
Step
1 Document scanner unit failure
2 Main PCB failure
■ Error code AE
Scanner Locked
Open the Document Cover and release scanner lock lever. Press Stop key.
The document scanner unit fails to detect the home position.
This error does not usually occur in the normal use. The conceivable causes are noise around
the installation site, fluctuation of the power supply voltage, and failures in the software.
<User Check>
- Turn OFF the power switch, and turn it ON again after a while.
Step
1 Main PCB failure
Cause
Cause
Cause
2-81
Remedy
Replace the second side scanning CIS.
Replace the main PCB ASSY.
Remedy
Replace the document scanner unit.
Replace the main PCB ASSY.
Remedy
Replace the main PCB ASSY.
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