Print Quality-Background - Lexmark C540n Service Manual

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
Read the current status of the imaging unit
1
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?
Is the background only one of the primary
2
colors; yellow, cyan, magenta, or black?
Did replacing the developer unit correct the
3
problem?
Replace the photoconductor unit.
4
Does this fix the problem?
Check the high-voltage contact from the HVPS
5
to the image transfer unit (ITU).
Is a problem found?
Reseat the cable in the JHVPS1 connector.
6
Does this fix the problem?
Replace the HVPS. See
7
supply (HVPS) assembly removal" on
page 4-38.
Does this fix the problem?
Clean the printhead.
8
Does this fix the problem?
Service Manual
2-44
Reset the value. To reset
this value:
1. In Ready mode, press
).
2. Select Supplies Menu,
).
3. Select Replace Supply,
4. Select the imaging unit,
5. Select Yes, and press
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:
• Image transfer unit
• High-voltage power
Problem resolved.
Problem resolved.
"High-voltage power
Problem resolved.
Yes
Go to step 2.
Menus ( ).
and press Select ( ).
and press Select ( ).
and press Select ( ).
Select ( ).
Go to step 4.
"Developer
4-21.
Go to step 4.
Go to step 5.
Go to step 6.
(ITU). See
"Image
transfer unit (ITU)
removal" on page 4-44.
supply (HVPS). See
"High-voltage power
supply (HVPS)
assembly removal" on
page 4-38.
Go to step 7.
Go to step 8.
Replace the printhead. See
"Printhead removal" on
page
No
4-69.
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