Brother MFC-4800 User Manual page 120

DIFFICULTY
Vertical streaks appear
in copies.
Printouts are too dark or
too 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 in black text and
graphic areas.
White Spots
Toner scatters and stains
the printed page.
Scattering Toner
13 - 12
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
SUGGESTIONS
Copy Quality Difficulties
Sometimes you may see vertical streaks on your
copies. Either the scanner or the primary corona
wire for printing is dirty. Clean them both.
(See pages 13-16 to 13-18)
Print Quality Difficulties
Adjust the print conditions by setting the Print Density
light function. It has been factory set to the middle
position. (See
Setting the Print Density,
You may fix this by wiping the scanner windows
with a clean soft cloth. (See
page 13-16 and
Scanner,
page 13-23.) If you still see white stripes or faint
images and the LCD shows
SOON, replace the drum unit with a new one.
Clean the FAX/MFC's interior and the primary
corona wire of the toner cartridge. (See
page 13-16 and
Maintenance,
page 13-18.) Make sure that the tab of the
Unit,
corona wire is at the home position (M). If after
cleaning, you still see dark stripes or toner stains
and the LCD shows
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 LCD shows CHANGE DRUM
replace the drum unit with a new one.
Adjust the print conditions by setting the Print
Density function. Remove the drum unit and clean the
FAX/MFC's interior. (See
page 13-16,
Cleaning the Printer,
Cleaning the Drum Unit,
you use paper that meets specifications. (See pages 2-
7.) If you still have scattered toner and the LCD shows
CHANGE DRUM
with a new one.
page 5-4.)
Cleaning the Document
Replacing the Drum Unit,
CHANGE DRUM
Cleaning the Drum
CHANGE DRUM
SOON,
Routine Maintenance,
page 13-17 and
page 13-18.) Make sure that
SOON, replace the drum unit
Routine
SOON,