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TROUBLESHOOTING PROCEDURES
16-16
MFC 4550/6550MC/7550MC
OP-US-5.0
Maintenance
Recommendation
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 16-6.
Clean the machine interior. See “Regular Maintenance” and
“Cleaning the Drum Unit” on page 14-2.
Make sure that you use paper that meets specifications See page
10-1.
If you still have the same problem and the display shows
CHANGE DRUM, replace the drum unit with a new one.
Wipe the electric terminals referring to page 14-2. Also, do not
use heat-sensitive paper as it will cause this problem.
If the same problem occurs 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 14-1~3.
• Make sure that a torn piece of paper does not remain on the
scanner window.
The problem may disappear by itself. Try copying multiple
pages to clear this problem. This may occur if the machine has
not been used for a long time.
This also may occur if the surface of the drum is scratched. You
must then replace the drum unit with a new one.
If the problem does 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.
Question
Nothing is printed on the
page.
Printed pages are
marked at regular
intervals.
Example of Regular
Marking
Scattering Toner
Black Page
White page