Lexmark C520 Series, Service Manual

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Diagnostic information
2-67
5022- xxx
Print quality service check
Note: This symptom may require replacement of one or more CRUs (Customer Replaceable Units) designated
as supplies or maintenance items, which are the responsibility of the customer. With the customer's permission,
you may need to install a developer (toner) cartridge or photoconductor unit.
Service tip: Before troubleshooting any print quality problems do the following:
1.
Print a menu settings page and check the life status of all supplies. Any supplies that are low should be
replaced.
2.
On the menu page, make sure the following is set to the default level:
–
Color Correction: Set to Auto.
–
Print Resolution: Set to 1200 dpi (print quality problems should be checked at different resolution
settings).
–
Toner Darkness: Set to 4 (default).
–
Color Saver: Set to OFF.
–
RGB Brightness, RGB Contrast, RGB Saturation: Set to 0.
–
Color Balance: Select Reset Defaults to zero out all colors.
–
Check the paper type, texture and weight settings against what is loaded in the printer
* Be sure and keep the original menu page to restore the customer's custom settings if needed.
Once the printer has been restred to their default levels, do the following:
3.
Inspect the transfer belt for damage. Replace if damaged.
4.
Inspect the OPCs and toners cartridges for damage. Replace if damaged.
5.
If paper other then 20lb plain letter/A4 paper is being used, load 20lb plain letter/A4 and print the Print
Quality pages to see if the problem remains.
6.
Use Tray 1 to test print quality problems.
7.
Print the Print Quality Pages and looked for variations in the print from what is expected.
An incorrect printer driver for the installed software can cause problems. Incorrect characters could print, and the
copy may not fit the page correctly.
Measure all voltages from the connector to the printer ground.