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TROUBLESHOOTING PROCEDURES
14-13
MFC 4450/OP-US-5.0
Maintenance
Suggestions
If toner scattered over the whole printing surface, adjust the
print density dial inside the printer counterclockwise. See “The
Print is too Light or too Dark”on page 14-5.
Clean the MFC interior. See “Regular Maintenance” and
“Cleaning the Drum Unit” on page 13-2~3.
Make sure that you use paper that meets specifications. See
page 9-1.
If you still have scattered toner and the display shows CHANGE
DRUM, replace the drum unit with a new one.
Wipe the electric terminals referring to page 13-2. Also, do not
use heat-sensitive paper as it will cause this problem.
If the printed pages are still black and the display shows
CHANGE DRUM, on after cleaning, replace the drum unit with
a new one.
• Make sure that the toner cartridge is not empty.
• Wipe the electric terminals referring to “Regular Maintenance”
and “Cleaning the Drum Unit” on page 13-1~3.
• Make sure that a torn piece of paper does not remain on the
scanner window.
Markings may disappear by themselves. Try copying multiple
pages to clear this problem. Markings may occur if the MFC has
not been used for a long time.
A possible cause is that the surface of the drum is scratched. You
must then replace the drum unit with a new one.
If the markings do not disappear, it may be that the drum was
marked or damaged by excessive exposure to light. In this case,
replace the drum unit with a new one.
The whole page is
printed in black.
Toner scatters and stains
the printed page.
Difficulty
Nothing is printed on the
page.
Printed pages are
marked at regular
intervals.
Example of Regular
Marking
Scattering Toner
Black Page
White page