Brother Business Smart MFC-J4510dw, Service Manual

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Confidential 2-86

White vertical streaks

Colored over the whole page
User Check
- Clean document cover glass or ADF glass.
- Clean the document pressure bar.
Step Cause Solution
1 White reference film of document
pressure bar of the document
scanner unit stained (in the case of
problem in the second side) Clean the white reference film of the document
scanner unit.
2 White reference film of document
scanner unit stained (in the case of
problem in first side) Clean document scanner unit glass at white
reference film.
3 White reference film stained
(first side or second side) Replace the document scanner unit.
4 First side or second side CIS unit
defective Replace the first side or second side CIS unit.
User Check
- Clean document cover glass or ADF glass.
- Clean the document pressure bar.
Step Cause Solution
1 White level correction data failure Carry out maintenance 55.
2 First side or second side CIS unit
defective Replace the first side or second side CIS unit.
3 Main PCB defective Replace the main PCB ASSY.