Xerox DocuPrint C621 User Manual page 104

4.4 Print Quality Problems
Description
Black lines are printed
Recurring stains are
found
4
Hair-line marks appeared
in or around black half-
tone printing
Shadows appeared
around areas of solid
black printing
88
Possible Cause
Is the drum cartridge scratched
or damaged?
There may be dirt in the paper
path.
Is the drum cartridge scratched
or damaged?
Did you use paper unpacked and
left unused for a long period of
time (especially when the
humidity is low)?
Did you use paper unpacked and
left unused for a long period of
time (especially when the
humidity is low)?
Solution
Replace with a new drum cartridge.
"6.2.2 Replacing the
Drum Cartridge"
Print several sheets to remove the dirt.
Replace with a new drum cartridge.
"6.2.2 Replacing the
Drum Cartridge"
Replace with new paper stock.
"2.2 Loading Paper"
Replace with new paper stock.
"2.2 Loading Paper"