Low Image Density - Lexmark C750 Service Manual

One color has light print over the entire page
Step Action and questions
1 Print cartridge - Make sure the cartridge is seated
properly and all packaging material is removed from
the cartridge.
Has all packaging material been removed and the
cartridge seated correctly?
2 Print cartridge - The cartridge may be out of toner.
Change or switch the cartridge.
Do you continue to have the same problem?
3 Cartridge contact assembly - Check the cartridge
contact block. Make sure the PC drum contact pin is
not stuck. See "Cartridge contact assembly pin
locations" on page 5-4
contact pin.

Low image density

Note: If all colors have a low image density problem set the Print Darkness to High from the user's menu.
•
If only one color has a problem, go to "Step A."
•
If all colors have a problem, go to "Step B."
Step A
Step Action and questions
1 Print cartridge - Make sure the print cartridge is seated
correctly.
Is the print cartridge seated correctly?
2 The print cartridge may be out of toner. Try a new print
cartridge.
Does a new print cartridge fix the problem?
Step B
Step Action and questions
1 Make sure that color calibration has not been disabled
in the Diagnostics menus, especially if the printer has
been previously serviced.
Was color calibration disabled?
2 Toner density calibration - Run toner density calibration
from the Utility menu.
Does this fix the problem?
to identify the PC drum
Yes No
Go to step 2 Remove the
packaging material
and seat the
cartridge.
Go to step 3 Problem resolved
Go to step 4 Replace the
cartridge contact
block.
Yes No
Go to step 2 Install the print
cartridge correctly
and recheck
Problem solved Replace the
"Transfer HVPS
board" on
page 4-81
Yes No
Set Color Go to step 2
Calibration on
Problem solved Replace the
"Transfer HVPS
board" on
page 4-81
Diagnostic information
5060-00x
2-143