Lexmark X734de Service Manual page 190

7526
Print quality—background
Service tip: Some background problems can be caused by rough papers, non-Lexmark toner cartridges or if the
media texture is set to the rough setting.
Some slick or coated papers may also cause background problems. Some problems occur with printers that run
a large amount of graphics in a humid environment.
Step Questions / actions
Read the current status of the photoconductor
1
unit from the customer menus.
To view the status of the photoconductor
units:
1. In Ready mode, press Admin Menu.
2. Touch Reports.
3. Touch Device Statistics.
Ask the customer if the photoconductor unit
has been recently replaced. It is possible the
photoconductor value was not reset and the
photoconductor unit is past end of life. If the
PC unit was recently replaced, reset the
value. If the PC unit was not replaced, replace
the PC unit.
Has the photoconductor unit been recently
replaced?
Replace the PC unit. See
2
unit removal" on page
Does this fix the problem?
Check the high voltage contact from the
3
HVPS to the transfer module.
Transfer belt high voltage
path (typical 4X)
Is a problem found?
Reseat the JHVPS connector.
4
Does this fix the problem?
Replace the HVPS. See
5
power supply (HVPS) removal" on
page 4-120.
Does this fix the problem?
Clean the printhead.
6
Does this fix the problem?
Service Manual
2-152
Reset the value. To reset
this value:
1. In Ready mode, press
2. Touch Supplies Menu.
3. Touch Replace
4. Select the PC color unit
5. Touch Yes.
If this does not fix the
problem, go to step 2.
Problem resolved.
"Photoconductor
4-144.
Replace the spring or the
transfer contact assembly.
Problem resolved.
Problem resolved.
"High-voltage
Problem resolved.
Yes
Go to step 2.
Admin Menu.
Supply.
you want to change
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Replace the printhead. See
"Printhead removal,
installation, and
adjustment" on
page
No
4-147.
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