Print Quality-Narrow Vertical Line; Print Quality-Random Marks - Lexmark C540 Service Manual

5025-2xx, 4xx
Print quality—narrow vertical line
Step Questions / actions
1 Replace the photoconductor unit. See
"Imaging unit (IU) removal" on page
Print quality—random marks
Service tip: The primary cause of random marks is loose material moving around inside the printer and attaching
to the photoconductor unit, developer roll, or transfer belt.
Step Questions / actions
1 Is there any loose or foreign material on the
imaging unit?
2 Is there any loose or foreign material on the
developer roll?
3 Is there any loose or foreign material on the
transfer belt?
2-48
Service Manual
Yes
Problem resolved.
4-35.
Yes
Inspect the imaging unit by
looking at the individual
developers and photo
conductors. Clean or
replace the faulty unit. See
"Imaging unit (IU)
removal" on page
Replace the developer unit.
Replace the image transfer
unit. See "Image transfer
unit (ITU) removal" on
page 4-33.
ABCDE
ABCDE
ABCDE
No
Replace the developer unit.
See "Developer unit
removal" on page
No
Go to step 2.
4-35.
Go to step 3.
Contact your next level of
support.
4-21.