Brother 09055CDN Service Manual page 119

■ Error code A9
Scan Unable A9
An image signal cannot be detected when an image is scanned. Or, an image signal is too
dark.
Step
1 Document scanner unit failure
2 Main PCB failure
■ Error code AA
---
Document scanner unit cover open detection error.
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
■ Error code AB
Scanner Error
Scanning resolution change error in the maintenance mode.
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
2-80
Remedy
Replace the document scanner unit.
Replace the main PCB ASSY.
Remedy
Replace the main PCB ASSY.
Remedy
Replace the main PCB ASSY.
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