Lexmark C920 Reference Manual page 22

Print quality guide
You can solve many print quality problems by replacing a supply or maintenance item that has reached the end
of its intended life. Check the operator panel for a message about a printer consumable. See "Determining the
status of supplies" in the User's Guide for information about other ways to identify consumables that need to be
replaced.
Use the following table to find solutions to print quality problems.
Symptom
Repeating defects
Color
misregistration
ABCDE ABCDE
ABCDE
ABCDE
dark lines
ABCDE
ABCDE
ABCDE
Cause
Either a toner cartridge, a
photodeveloper, the transfer belt or the
fuser is defective.
Color has shifted outside of the
appropriate area or has been
superimposed over another color area.
A toner cartridge, a photodeveloper, or
the transfer belt is defective.
Print quality guide
Page 1 of 7
Solution
Marks occur repeatedly only in one
color and multiple times on a page:
• Replace the toner cartridge if the
defects occur every:
– 45.1 mm (1.78 in.)
– 60 mm (2.4 in.)
• Replace the photodeveloper (black
alone or all other colors at once) if
the defects occur every:
– 31.5 mm (1.2 in.)
– 94 mm (3.7 in.)
Marks occur across the page
repeatedly in all colors:
• Replace the transfer belt if the
defects occur every 27 mm (1.1 in.)
• Replace the fuser if the defects occur
every 140 mm (5.5 in.)
Top to Bottom or Left to Right:
1 Re-seat the cartridges by removing
them from the printer and then
reinserting them.
2 Adjust the color alignment. Use the
Alignment page under the Utilities
Menu.
If the problem is on the front (print side)
of the page:
1 Replace the color cartridge causing
the line.
2 If you still have the problem, replace
the photodeveloper (black alone or
all other colors at once).
If the problem is on the back of the
page, replace the transfer belt.