Brother DCP-7090 Service Manual page 63


Partially shaded
<User Check>
• Clean the scanner glass.
Step
1 Dirt inside of scanner glass
2 Deformed document sponge
 Fully tinged
Step
Incorrect white level
1
correction data
First or second side CIS unit
2
failure
3 Main PCB failure
Cause
Clean the inside of scanner glass.
Replace the document scanner unit.
<User Check>
• Clean the scanner glass or first side/second side
scanner glass strip.
Cause
Execute "Acquire white level data (Function
code 55)".
Replace the first or second side CIS unit.
Replace the main PCB ASSY.
Remedy
Remedy