Lexmark 5021-0XX - Manual (Page 205)

Diagnostic information 2-127
5021-0XX
Uneven density (right and left)
Optical density is different between right and left side of printed
image.
Problem area Action
1 Rear cover assembly Open rear cover assembly and
reclose, ensuring that both sides
properly latch. If rear cover assembly
will not properly latch, ensure that
white door actuators located at top of
rear cover assembly are not
damaged. If damaged, replace.
These items are part of parts packet.
If actuators are not damaged, and
door will still not latch, replace rear
cover assembly. See
“Rear cover
assembly removal” on page 4-22 .
2 Transfer roller Transfer roller is not properly
installed. Remove transfer roller and
reinstall. See
“Transfer roller
removal” on page 4-8 . Ensure
transfer roller bias pole is touching
spring contact on left side (as viewed
from front of printer) of roller.
3 Laser unit assembly
(printhead) Dust-proof glass of laser unit is
smeared with toner or foreign
particles. Clean glass:
• Remove toner cartridges and
photodeveloper cartridge. See
“Photodeveloper cartridge
removal” on page 4-11
.
• Open glass cover.
• Clean glass.
There are foreign particles adhering
to laser beam opening of printhead.
Clean laser beam opening.
4 Toner cartridge Toner cartridge has insufficient
amount of toner. Replace toner
cartridge.
5 Photodeveloper cartridge Replace faulty photodeveloper
cartridge. See
“Photodeveloper
cartridge removal” on page 4-11 .