Dirt On Paper; Wrinkles - Brother HL-4040CN Service Manual

3.4

Dirt on Paper

User Check
- Check if the paper is loaded into the paper tray correctly.
- Turn over the stack of paper in the paper tray, or try rotating the paper 180° in the paper tray.
Step
1 Fuser unit dirty
2 Dirt on belt unit
electrode
3 Dirt on waste
toner box
electrode
4 Belt unit dirty
5 Toner leak from
the waste toner
box
3.5

Wrinkles

User Check
- Check if the paper is loaded into the paper tray correctly.
- Turn over the stack of paper in the paper tray, or try rotating the paper 180° in the paper tray.
Step
1 Fuser unit failure
Cause
Is there dirt around the
entrance of the fuser unit?
Is the pressure roller
ASSY dirty?
Is the electrode of the belt
unit dirty?
Is the electrode of the
waste toner box dirty?
Does dirt on the paper
disappear after replacing
the belt unit with a new
one?
Is the waste toner box full
of toner?
Cause
Do wrinkles on the paper
disappear after replacing
the fuser unit with a new
one?
Check
Result
Yes
Yes
Yes
Yes
Yes
Yes
Check
Result
Yes
1-40
Remedy
Clean the entrance of the
fuser unit.
Clean the pressure roller
ASSY.
Clean the electrode of the
belt unit.
Clean the electrode of the
waste toner box.
Replace the belt unit.
Replace the waste toner
near/full sensor ASSY.
Or, replace the main PCB
ASSY.
Remedy
Replace the fuser unit.
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