Brother Model 5750e Owner's Manual page 193

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
19 - 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 19-18 to 19-20)
Print Quality Difficulties
Adjust the print conditions by setting the Print Density
setting. 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 19-18 and
Scanner
page 19-23.) If you still see white stripes or faint
images and the LCD shows CHANGE DRUM
SOON, replace the drum unit with a new one.
Check the machine's environment. Conditions
such as humidity and high temperatures may cause
this print defect to occur.
Clean the machine's interior and the primary
corona wire of the toner cartridge. ( See
, page 19-18 and
Maintenance
page 19-19.) Make sure that the tab of the
Unit,
corona wire is at the home position. If after
cleaning, you still see dark stripes or toner stains
and the LCD shows CHANGE DRUM SOON,
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 SOON,
replace the drum unit with a new one.
Check the machine's environment; conditions such
as high humidity may cause this situation to occur.
page 5-4.)
Cleaning the Document
Replacing the Drum Unit,
Routine
Cleaning the Drum