Negative Ghosting Or Faded Image; Residual Image; Uneven Printing - Lexmark C77x Service Manual

Negative ghosting or faded image

The print has a negative ghost on the page or the image is faded, particular with text. This problem may happen
with any color and can be mistaken as toner smudges on the page.
Step Actions and questions
1 Check the bellcranks of the color that is having the
problem.
Is a bellcrank broken or missing?
2 Check each of the springs that attach to the bellcranks
to make sure they are attached and not broken or
missing.
Are the springs for the color having the problem
missing or unattached?

Residual image

•
If only one color has a residual image repeated every 95 mm, replace the print cartridge.
•
If all colors have a residual image 147 mm from the top of the page, replace the fuser assembly.
Note: Do the following steps before you replace the fuser assembly:
1.
Check Media Type setting on the operator panel. If the setting is for light paper, select the correct
setting for the current media type.
2.
If the problem continues, set the fuser temperature selection to High.
3.
If the problem continues, check the page count. If the page count is greater than 200K copies and the
fuser has not been replaced, advise the customer to install a new fuser CRU or a maintenance kit.
•
If only one color has a residual image problem, go to
page 2-98.
•
If all colors have a residual image problem, go to

Uneven printing

•
If all colors have uneven print, replace the ITU assembly.
•
The uneven print may appear as spots or streaks that are different on each page. The most likely cause for
this type of problem is damage to the ITU belt in the ITU assembly. Replace the
on page 4-49.
•
If only one color is missing or printing uneven, go to step 1.
Step Actions and questions
1 Print cartridge—Make sure the cartridge is seated
properly and that all packing material has been
removed from the cartridge.
Has all packing material been removed? Is the
cartridge seated correctly?
2 Cartridge check—the cartridge may be out of toner or
have another toner problem. Try a new toner cartridge.
Does a new toner cartridge fix the problem?
Yes No
Replace the Got to step 2
broken or
missing
bellcrank.
Repair or replace Look for any
the spring as signs of missing
necessary. or damaged parts
in the area of the
color having the
problem,
including the ITU.
"Horizontal lines or streaks" on
"Residual image" on page
"ITU assembly removal"
Yes No
Problem resolved Go to step 2
Problem resolved Contact your next
level of support.
Diagnostic information
5061
2-101.
2-101