HL-5240/5250DN/5270DN/5280DW SERVICE MANUAL
Confidential
4-45
(I-7) Black and blurred horizontal stripes
Possible cause Step Check Result Remedy
Ground
contacts
Scratch on the
drum
1 Are the horizontal stripes at
74mm (exposure drum)
intervals?
Yes The exposure drum
was scratched.
Replace the drum
unit.
Toner stuck on
the developer
roller
2 Are the horizontal stripes at
62.8mm (developer roller)
intervals?
Yes After printing several
pages, the problem
will disappear.
If not, replace the
toner cartridge.
Scratch on the
heat roller
3 Are the horizontal stripes at
79mm (heat roller) intervals?
Yes Replace the fuser unit.
Corona contact
failure
4 Are the charge electrodes
between the printer body and
the drum unit dirty?
Yes Clean both electrodes.
(3)
High-voltage
power supply
PCB failure
5 Is the problem solved after
replacing the high-voltage
power supply PCB?
Yes Replace the high-
voltage power supply
PCB.
(I-8) Black vertical streaks (in a gray background)
Possible cause Step Check Result Remedy
Ground
contacts
Translucent
stain on the
scanner window
1 Is there any dirt on the scanner
window?
Yes 1) Clean the scanner
window.
2) If it is not effective,
replace the laser
unit.
Corona failure 2 Is the corona wire dirty? Yes Clean the corona wire
with the wire cleaner.
(2)
User Check
(1) The drum unit may be damaged. Install a new drum unit.
(2) Check the paper used meets the recommended paper specifications.
(3) Clean inside of the printer and the corona wire in the drum unit.
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