Brother MFC-J6920DW, Service Manual

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Confidential 2-81

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 First side or second side CIS
unit defective Replace the first side or second side CIS unit.
2 White reference tape of
document scanner unit stained
(in the case of problem in first
side) Clean the document scanner unit glass at white
reference tape.
3 White reference tape of
document pressure bar of ADF
cover stained (in the case of
problem in second side) Clean the white reference tape of document
pressure bar of ADF cover.
4 White reference tape of
document scanner unit
damage, broken (in the case of
problem in first side) Replace the document scanner unit.
5 White reference tape of
document pressure bar of ADF
cover damage, broken (in the
case of problem in second
side) Replace the ADF cover.
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.