Lexmark C540 - Print Quality-Background

Diagnostic information 2-43
5025-2xx, 4xx
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 Yes No
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?
Reset the value. To reset
this value:
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 ().
If this does not fix the
problem, go to step 2.
Go to step 2.
2
Is the background only one of the primary
colors; yellow, cyan, magenta, or black?
Replace the developer unit
for the background color
and retest. See “Developer
unit removal” on
page 4-21.
Go to step 3.
Go to step 4.
3
Did replacing the developer unit correct the
problem?
Problem resolved. Go to step 4.
4
Replace the photoconductor unit.
Does this fix the problem?
Problem resolved. Go to step 5.
5
Check the high-voltage contact from the HVPS
to the image transfer unit (ITU).
Is a problem found?
Replace the failing part:
• Image transfer unit
(ITU). See “Image
transfer unit (ITU)
removal” on page 4-33.
• High-voltage power
supply (HVPS). See
“High-voltage power
supply (HVPS)
assembly removal” on
page 4-31.
Go to step 6.
6
Reseat the cable in the JHVPS1 connector.
Does this fix the problem?
Problem resolved. Go to step 7.
7
Replace the HVPS. See “High-voltage power
supply (HVPS) assembly removal” on
page 4-31.
Does this fix the problem?
Problem resolved. Go to step 8.
8
Clean the printhead.
Does this fix the problem?
Problem resolved. Replace the printhead. See
“Printhead removal” on
page 4-49.