Brother DCP-7055 Service Manual page 134

■ Faulty registration (Error code B3, B4, etc)
- ADF
Step
Fine adjustment of scan start
1
position misalignment
Document scanning position
2 actuator catching on some
position
- Document table
Step
Fine adjustment of scan start
1
position misalignment
2 Document scanner unit failure
■ Dark (Error code BB, etc)
Step
White level data malfunction
1
2 CIS unit failure
3 Main PCB failure
Cause
Cause
User Check
• Check whether the setting of the contrast does not become dark.
Cause
2-97
Remedy
Perform the fine adjustment of scan start
position. (Function code
Correct catching of the document scanning
position actuator.
Remedy
Perform the fine adjustment of scan start
position. ("Function code
Replace the document scanner unit.
Remedy
Perform the acquisition of white level data.
("Function code 55")
Replace the document scanner unit.
Replace the main PCB ASSY.
54)
55")
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