Brother DCP-7080 Service Manual page 127

 Vertical streaks
Step
Dirt inside of scanner glass
1
Dirt inside of ADF glass
2
First or second side CIS unit failure Replace the first or second side CIS unit.
3
Scratch on scanner glass
4
Scratch on ADF glass
5
 White streaks
Step
Dirt inside of scanner glass
1
Dirt inside of ADF glass
2
First or second side CIS unit failure Replace the first or second side CIS unit.
3
Scratch on scanner glass
4
Scratch on ADF glass
5
<User Check>
- Clean the scanner glass or ADF glass.
- Clean the document hold.
Cause
<User Check>
- Clean the scanner glass or ADF glass.
- Clean the document hold.
Cause
2-92
Remedy
Clean the inside of the scanner glass.
Clean the inside of the ADF glass.
Replace the document scanner unit.
Replace the ADF unit.
Remedy
Clean the inside of the scanner glass.
Clean the inside of the ADF glass.
Replace the document scanner unit.
Replace the ADF unit.
Confidential