Brother DCP-L8400CDN Service Manual page 160

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White vertical streaks
< User Check >
Step
1 Foreign object inside the
document scanner unit
2 Foreign object inside the
second side CIS glass
3 Dirt on each roller of the ADF
4 Dirt on the ADF paper feed
section
5 Dirt inside the second side
CIS glass
6 Dirt inside the document
scanner unit
7 First side or second side CIS
unit failure
8 Scratch on second side CIS
glass
9 Scratch on document glass or
first side CIS glass
- Clean the first side CIS glass or document glass.
- Clean the second side CIS glass.
Cause
2-130
Remedy
Remove the foreign object.
Remove the foreign object.
Clean each roller of the ADF.
Clean the ADF paper feed section.
Clean inside the second side CIS glass.
Clean inside the document scanner unit.
Replace the first side or second side CIS
unit.
Replace the ADF unit.
Replace the document scanner unit.
Confidential