Print Quality Problems - Oki B840n User Manual

P
RINT QUALITY PROBLEMS
Before consulting a service representative regarding a print quality problem, check the
table below to see if there is a solution, or something you might have overlooked.
SYMPTOM
Blank sheets printed.
Entire page prints
faintly.
Page has grey
background.
Page prints all black.
Oblong area of faint
print appears on
each page.
Vertical white
streaking or faint
areas on page.
Vertical black lines.
Fuzzy print.
Faded print.
Smeared or blotched
print.
Printed page is light/
blurred.
Bold characters and
dark lines are
smeared.
Print is darker than
usual.
Pages curl
excessively.
PROBLEM
Image drum cartridge
not properly installed.
Empty toner cartridge.
Empty toner cartridge.
Pages get fainter when
toner is used up.
LED array is dirty.
Static electricity,
generally from dry
environments, causes
toner to stick to
background.
Hardware problem.
Drop out caused by
using paper exposed to
high humidity.
Toner is low and does
not distribute properly,
or the drum is worn out.
LED array is dirty.
Hardware problem.
LED array is dirty.
Toner low.
Dirty rollers; toner
dropped inside printer or
image drum problem.
Is toner low?
Is paper meant for laser
printers?
LED array is dirty.
Toner is low.
Darkness setting is too
high.
Printing on wrong side
of paper.
Moisture in paper.
Improper storage.
High humidity.
Troubleshooting > 71
SOLUTION
Reinstall image drum cartridge.
Replace with a new EP toner cartridge.
Replace with a new EP toner cartridge.
Clean LED array.
Change paper to a smoother laser bond or
use a humidifier.
Contact service.
Change paper stocks, check paper storage
environment or use a dehumidifier; check
toner level.
Replace with a new EP toner cartridge.
Contact service.
Clean LED array.
Contact service.
Clean LED array.
Replace with a new EP toner cartridge.
Replace with a new EP toner cartridge.
Contact service.
Replace with a new EP toner cartridge.
Use recommended paper.
Clean LED array.
Replace with a new EP toner cartridge.
Change darkness setting.
Turn paper over in tray. (Note arrow on
paper package). Install paper print side
down in tray.
Avoid storing paper in areas of excessive
temperature and humidity. Store paper in
protective wrapping.
Recommended operating humidity: 20-
80%.