Brother DCP-9055CDN Service Manual page 121

■ Error code B7
Scanner Error
A/D converter standard voltage failure; at High side.
* This error is indicated on the LCD in the maintenance mode.
Error code B8
Scanner Error
A/D converter standard voltage failure; at Low side.
* This error is indicated on the LCD in the maintenance mode.
Step
1 Second side scanning CIS failure
2 Document scanner unit failure
3 Main PCB failure
■ Error code B9
Scanner Error
Scanning light adjustment error.
* This error is indicated on the LCD in the maintenance mode.
Step
1 Second side scanning CIS failure
2 Document scanner unit failure
3 Main PCB failure
■ Error code BA
Scanner Error
Scanning outside light detection error.
* This error is indicated on the LCD 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
2-83
Remedy
Replace the upper document chute ASSY.
Replace the document scanner unit.
Replace the main PCB ASSY.
Remedy
Replace the upper document chute ASSY.
Replace the document scanner unit.
Replace the main PCB ASSY.
Remedy
Replace the main PCB ASSY.
Confidential