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124
C H A P T E R F I F T E E N
DIFFICULTY
Print Quality Difficulties
Printouts are too dark or light
Printed pages contain white stripes.
White Stripes or
Faint lmages
Printed pages are stained with toner
or have vertical stripes.
Dark Stripes or Toner Stains
Printed pages have white spots in
black text and graphic areas.
White Spots
Toner scatters and stains the printed
page.
Scattering Toner
The whole page is printed black.
Black Page
Nothing is printed on the page.
White page
Printed pages are marked regular
intervals.
Example of Regular Marking
SUGGESTIONS
Adjust the print conditions by setting the Print Density function, It has
been factory set to the middle position. See "Setting the Print Density" in
chap. 6.
You may fix this by wiping the scanner windows with a clean soft cloth.
(See "Regular Maintenance" and "Cleaning the Drum Unit" in this
chapter.) If you still see white stripes or faint images and the display
shows CHANGE DRUM SOON, replace the drum unit with a new one.
Check the machine's environment. Conditions such as humidity, high
temperatures, etc. may cause this print defect to occur.
Clean the machine's interior and the primary corona wire of drum unit.
See "Regular Maintenance" and "Cleaning the Drum Unit" in this
chapter. Make sure that the tab of the corona wire is at the home position.
If after cleaning, you still see dark stripes or toner stains and the display
shows CHANGE DRUM SOON, replace the drum unit with a new one.
Make sure that you use paper that meets the specifications. Rough
surface or thick media can cause the problem. If you still see white spots
and the display shows CHANGE DRUM SOON, replace the drum unit
with a new one. Check the machine's environment; conditions such as
high humidity may cause this situation to occur.
Adjust the print conditions by setting the Print Density function. Clean
the machine's interior. See "Regular Maintenance" and "Cleaning the
Drum Unit" in this chapter. Make sure that you use paper that meets
specifications. See chap. 12. If you still have scattered toner and the
display shows CHANGE DRUM SOON, replace the drum unit with a
new one. Check the machine's environment; high temperature and high
humidity conditions may cause this condition to occur.
Clean the machine's interior and the primary corona wire of the drum
unit. Also, do not use heat-sensitive paper as it will cause this problem.
After cleaning, if the printed pages are still black or the display shows
CHANGE DRUM SOON, replace the drum unit with a new one. The
drum unit may be damaged.
Make sure that the toner cartridge is not empty. Wipe the electric
terminals referring to "Regular Maintenance" and "Cleaning the Drum
Unit" in this chapter. Make sure that a torn piece of paper does not
remain on the scanner window.
Markings may disappear by themselves. Try copying at multiple pages
to clear this problem. Markings may occur if the machine has not been
used for a long time. A possible cause is that the surface of the drum is
marked or damaged by excessive exposure to light. In this case, replace
the drum unit with a new one.
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