Lexmark C78x User Manual

2-100 Service Manual
5061
Vertical lines or streaks
Horizontal lines or streaks
If the horizontal marks or lines repeat at evenly-spaced intervals, use the “Print quality defect locator chart”
on page 3-3 to determine the part to be replaced.
For lines or marks appearing at random intervals, go to step 1.
Step Actions and questions Yes No
1 Are the vertical lines or streaks visible outside the
printed image?
Go to step 2 Replace the
cartridge.
2
Are the vertical streaks in a single color? Go to step 3 Replace the ITU
assembly. See
“ITU assembly
removal” on
page 4-49.
3
Vertical streaks in a single color, which are visible
outside the printed area are most likely caused by a
cleaner problem in the print cartridge.
Are streaks magenta, cyan, or yellow?
Replace the
cartridge.
Replace in order:
• Black print
cartridge
•ITU
assembly.
See “ITU
assembly
removal” on
page 4-49.
Step Actions and questions Yes No
1 Does the printer display an 83 ITU Maintenance
message?
Recommend the
customer order
the ITU
maintenance kit.
See “Scheduled
maintenance”
on page 6-1.
Go to step 2
2
Are the horizontal marks or lines in a single color? Replace the
cartridge.
Go to step 3
3
Print cartridge(s)—Enter the Diagnostics mode.
Remove one print cartridge at a time, and run a Test
Page to isolate the faulty print cartridge.
Have you isolated the failing print cartridge?
Replace the
“Cartridge
contact
assembly
removal for the
failing color on
page 4-35.
Go to step 4
4
Reseat the ITU.
Do the marks/lines persist?
Replace the “ITU
assembly
removal” on
page 4-49.
Problem resolved

Lexmark C78x Specifications

General

Brand	Lexmark
Model	C78x
Category	Printer
Language	English