HL-5240/5250DN/5270DN/5280DW SERVICE MANUAL
Confidential
4-43
(I-5) Dirt on the back of paper
Possible cause
Step
Check
Result
Remedy
Fuser unit dirty
1
Is the pressure roller dirty?
Is any other area in the printer
dirty?
Yes
Clean the pressure roller
referring to the following
procedure.
Yes
Replace the drum unit
Dirt in the drum
unit
2
Is the transfer roller dirty?
Is the problem solved after
replacing the drum unit?
No
Replace the high-voltage power
supply PCB.
NOTE:
This problem may disappear after printing approximately 10 pages of completely blank sheets.
How to clean the pressure roller
Clean the pressure roller as follows;
(HL-5240/5250DN)
(1) Set five or more sheets of paper in the paper tray.
(2) Open the front cover, and turn on the power switch while holding down the
Go
button.
(3) All LEDs light up, and keep the
Go
button pressed down until the
Status
LED goes off.
Then, release the
Go
button and make sure that all LEDs are off.
(4) Press
the
Go
button once and make sure that
Toner
,
Drum
and
Paper
LEDs light up.
(5) Press
the
Go
button twice and wait for two seconds. Then, the printer starts printing the
grid pattern continuously.
(6) Close the front cover, and print approximately five pages.
(7) Press
the
Job Cancel
button after printing.
(HL-5270DN/5280DW)
(1) Set five or more sheets of paper in the paper tray.
(2) Open the front cover, and turn on the power switch while holding down the
Go
button.
(3) “USERS MODE” message appears on the LCD panel.
(4) Release
the
Go
button and make sure that all LEDs are off.
(5) Press
the
Go
button once and make sure that “USERS MODE” message appears on the
LCD panel with the orange backlight.
(6) Press
the
Go
button twice and wait for two seconds. Then, the printer starts printing the
grid pattern continuously.
(7) Close the front cover, and print approximately five pages.
(8) Press
the
Job Cancel
button after printing.