Print Quality; Symptom Table-Print Quality - Lexmark C792e 5062-210 Service Manual

Print quality

Note: These symptoms 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.
Service tip: Before troubleshooting any print quality problems, do the following:
1.
Print a menu settings page, and then check the life status of all supplies. Any supplies that are low should
be replaced.
Note: Be sure and keep the original menu page to restore the customer's custom settings if needed.
2.
On the menu page, make sure the following is set to the default level:
–
Color Correction: Set to Auto.
–
Print Resolution: Set to 4800 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.
Once the printer has been restored to its default levels, do the following:
3.
Inspect the transfer module for damage. Replace if damaged.
4.
Inspect the print cartridges for damage. Replace if damaged.
5.
If paper other than 20 lb plain letter/A4 paper is being used, load 20 lb plain letter/A4 and print the Print
Quality pages to see if the problem remains. Use Tray 1 to test print quality problems.
6.
Print the Print Quality Pages, and then look 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.
Symptom table—print quality
Symptom
Background (fog)
Blank page
Blurred or fuzzy print
Characters have jagged or uneven edges
Clipped images
Colors not properly aligned
Horizontal banding
Horizontal lines
Light colored line, white line, or incorrectly
colored line
Media damage
Mottle (2–5mm speckles)
Paper curl
Print irregularities
Print is too dark
Action
Go to "Background (fog)" on page
Go to "Blank page" on page
Go to "Blurred or fuzzy print" on page
Go to "Characters have jagged or uneven edges" on
page 2-25
Go to "Clipped images" on page 2-25
Go to "Colors not properly aligned" on page 2-26
Go to "Horizontal banding" on page
Go to "Horizontal lines" on page
Go to "Light colored line, white line, or incorrectly colored
line" on page 2-28.
Go to "Media damage" on page 2-29
Go to "Mottle (2–5mm speckles)" on page
Go to "Paper curl" on page 2-30
Go to "Print irregularities" on page
Go to "Print is too dark" on page 2-32
2-22.
2-24.
2-25.
2-27.
2-27.
2-30.
2-30.
Diagnostic information
5062
2-21