Brother DCP-7055 Service Manual page 135

■ Completely blank
Step
1 CIS unit failure
2 Main PCB failure
■ Vertical streaks
- ADF
Step
1 CIS unit failure
■ White vertical streaks
Step
White level data malfunction
1
2 CIS unit failure
User Check
• Check if the first side and second side of the document are
reversed.
Cause
User Check
• Check if the ADF glass or document glass is not stained.
Cause
User Check
• Check if the ADF glass or document glass is not stained.
Cause
2-98
Remedy
Replace the document scanner unit.
Replace the main PCB ASSY.
Remedy
Replace the document scanner unit.
Remedy
Perform the acquisition of white level data.
("Function code 55")
Replace the document scanner unit.
Confidential