2-54 Service Manual
Print quality—narrow vertical line
Print quality—random marks
Service tip: The primary cause of random marks is due to loose material moving around inside the printer and
attaching to the photoconductor unit, developer roll, or transfer belt.
Step Questions / actions Yes No
1 Replace the photoconductor unit. See
“Imaging unit (IU) removal” on page 4-40.
Problem solved. Replace the developer unit.
See “Developer unit
removal” on page 4-42
Step Questions / actions Yes No
1 Is there any loose or foreign material on the
imaging unit?
Inspect the imaging unit by
looking at the individual
developers and
photoconductors. Clean or
replace the faulty unit. See
“Imaging unit (IU)
removal” on page 4-40.
Go to step 2.
2
Is there any loose or foreign material on the
developer roll?
Replace the developer unit. Go to step 3.
3
Is there any loose or foreign material on the
transfer belt?
Replace the image transfer
unit. See “Image transfer
unit (ITU)” on page 4-35.
Contact your next level of
support.
Y112730-2
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