Print Quality-Background - Lexmark C540n Service Manual

Print quality—background
Service tip: Some background problems can be caused by using rough paper or
incorrectly setting the operator panel settings to rough texture when the texture is not
rough. Using non-Lexmark toner cartridges may also cause the problem.
Some slick or coated papers may also cause background problems. Some problems
occur by running a large amount of graphics in a humid environment.
Step Questions / actions
1 Read the current status of the imaging unit
from the customer menus.
To view the status of the photoconductor units:
1. In Ready mode, press Menus (
2. Select Reports, and press Select (
3. Select Device Statistics, and press
Select ( ).
It is possible a new imaging unit was installed,
but the counter was not reset.
Has the imaging unit been recently replaced?
2 Is the background only one of the primary
colors; yellow, cyan, magenta, or black?
3 Did replacing the developer unit correct the
problem?
4 Replace the photoconductor unit.
Does this fix the problem?
5 Check the high-voltage contact from the HVPS
to the image transfer unit (ITU).
Is a problem found?
6 Reseat the cable in the JHVPS1 connector.
Does this fix the problem?
7 Replace the HVPS. See
supply (HVPS) assembly removal" on
page 4-35.
Does this fix the problem?
8 Clean the printhead.
Does this fix the problem?
Reset the value. To reset
this value:
).
).
If this does not fix the
problem, go to step 2.
Replace the developer unit
for the background color
and retest. See
unit removal" on
page
Go to step 3.
Problem resolved.
Problem resolved.
Replace the failing FRU:
Problem resolved.
"High-voltage power Problem resolved.
Problem resolved.
Yes
1. In Ready mode, press
Menus ( ).
2. Select Supplies Menu,
and press Select ( ).
3. Select Replace Supply,
and press Select ( ).
4. Select the imaging unit,
and press Select ( ).
5. Select Yes, and press
Select ( ).
"Developer
4-21.
• Image transfer unit
(ITU). See "Image
transfer unit (ITU)
removal" on page 4-40.
• High-voltage power
supply (HVPS). See
"High-voltage power
supply (HVPS)
assembly removal" on
page 4-35.
5025-2xx, 4xx
No
Go to step 2.
Go to step 4.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
Replace the printhead. See
"Printhead removal" on
page 4-65.
2-41
Diagnostic information