Brother MFC-6800 - Manual (Page 193)

T R O U B L E S H O O T I N G A N D R O U T I N E M A I N T E N A N C E 20 - 14
DIFFICULTY SUGGESTIONS
Print Quality Difficulties (
CONTINUED
)
The whole page is
printed black.
Black Page
Wipe the electric terminals referring to See page
20-18. Also, do not use heat-sensitive paper as it
will cause this problem. After cleaning, if the
printed pages are still black and the LCD shows
CHANGE DRUM SOON , replace the drum unit
with a new one.
Nothing is printed on
the page.
White page
Make sure that the toner cartridge is not empty.
Wipe the electric terminals. (See
Routine
Maintenance, page 20-17, Cleaning the Printer, page
20-18 and Cleaning the Drum Unit, page 20-19.)
Make sure that a torn piece of paper does not
remain on the scanner window.
Printed pages are
marked at regular
intervals.
Example of Regular
Mark
Marks may disappear by themselves. Try copying
multiple pages to clear this problem. Marks 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 Marks 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.
Printed pages are
blurred at the center or
at either edge.
Blurred Page
Certain environmental conditions such as humidity,
high temperatures, etc. may cause this condition to
occur. Make sure the MFC is placed on a flat,
horizontal surface. Remove the drum unit with the
toner cartridge installed. Try rocking them from side
to side. You may clear a blurred page by wiping the
scanner windows with a clean soft cloth. (See
Routine Maintenance, page 20-17, Cleaning the
Printer, page 20-18 and Cleaning the Drum Unit,
page 20-19.) If a blurred page occurs after cleaning
and the LCD shows
CHANGE DRUM SOON ,
replace the drum unit with a new one.
Ghost images appear on
printed pages.
Ghost Images
Adjust the print conditions by changing the Print
Density setting, page 5-4.—OR—
Rough surfaces or thick media can cause a ghost
image. Make sure you select the Paper Type that
suits the paper in your multi-purpose sheet feeder.
(See
Paper Type, page 11-7 and 11-9 and Media
Type, page 13-4.)
Note
The drum unit is a consumable item and it is necessary to replace it periodically.