Brother HL-4000CN Service Manual page 294

<Crease>
Condition:
Print on creased paper.
Initial check:
Parts of different specifications, improper installation, damage, deformation, dirt, foreign
substance attached, etc.
Major parts to be checked:
Paper feeder, Chute ASSY REGI, Chute ASSY out, Transfer roll cartridge ASSY, Print
head cartridge ASSY, Fuser ASSY
Item Check
Wet paper
Do the wrinkles disappear if the paper is replaced
1
with newly unpacked paper?
Faulty fuser ASSY
2 Check the heat roll and NIP belt for evidence of
damage, dirt, or foreign substances.
Paper skew feed
3
Check if the paper is fed on the skew
Faulty paper transfer path
4 Check the paper transfer path for presence of burrs,
foreign substances or dirt.
Faulty paper transfer rolls
Check the paper transfer rolls for evidence of
5
foreign substances, dirt, deformation, or
malfunction.
<Poor fusing>
Condition:
Image is easily peeled off when scrubbed by hand.
Initial check:
Parts of different specifications, improper installation, damage, deformation, dirt, foreign
substance attached, etc.
Major parts to be checked:
Fuser ASSY
Item Check
Wet paper
Do the wrinkles disappear if the paper is replaced
1
with newly unpacked paper?
Faulty fuser ASSY
2 Is the image quality improved if print head cartridge
ASSY is replaced?
V-84
Remedy
Replace paper
(Ask the customer for
storing the paper in a dry
place)
Replace the fuser ASSY
Go to Paper skew.
Clean or replace the
parts concerned.
Clean or replace the
parts concerned.
Remedy
Replace paper
(Ask the customer for
storing the paper in a dry
place)
Replace the fuser ASSY