Brother MFC-9660 Owner's Manual page 143

DIFFICULTY
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
134
Chapter 18
Clean the machine's interior and the primary corona wire of drum
unit. (See Regular Maintenance, page 139 and Cleaning the Drum
Unit, page 141.) 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. (See
Acceptable Paper, page 64.) 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.
Adjust the print conditions by setting the Print Density function.
(See Setting the Print Density, page 28.) Clean the machine's
interior. (See Regular Maintenance, page 139 and Cleaning the
Drum Unit, page 141.) Make sure that you use paper that meets
specifications. (See Acceptable Paper, page 64.) If you still have
scattered toner and the display shows CHANGE DRUM SOON,
replace the drum unit with a new one.
Clean the machine's interior and the primary corona wire of the
drum unit. (See Regular Maintenance, page 139 and Cleaning the
Drum Unit, page 141.) 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. If the toner cartridge
is empty, replace the toner cartridge. (See Replacing the Toner
Cartridge, page 142.)
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.
SUGGESTIONS