Brother FAX-2840 Basic User's Manual page 112

Examples of poor print quality
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
Black lines down the page
Printed pages have toner stains
down the page.
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
White lines down the page
F G H
A B C D E
h i j k
a b c d e f g
A B C D
a b c d e
0 1 2 3 4
The print is skewed on the page.
104
Recommendation
 Clean the corona wire inside the drum unit by sliding the green
tab. (See Cleaning the corona wire uu page 66.)
Make sure the green tab of the corona wire is at the home 

position (a).
 The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit uu page 59.)
The toner cartridge may be damaged. Put in a new toner

cartridge. (See Replacing the toner cartridge uu page 54.)
 The fuser unit may be contaminated. Call Brother Customer
Service or your local Brother dealer.
 Check if the Replace Toner Setting is set to Continue
(Continue mode), by pressing Menu, 1, 7. (See Advanced User's
Guide: Toner Settings.)
 Make sure that foreign material such as a torn piece of paper,
sticky notes or dust are not inside the machine or around the drum
unit and toner cartridge.
 The toner cartridge may be damaged. Put in a new toner
cartridge. (See Replacing the toner cartridge uu page 54.)
 The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit uu page 59.)
 Make sure that the paper or other print media is loaded correctly
in the paper tray and that the guides are not too tight or too loose
against the paper stack.
 Set the paper guides correctly. (See Loading paper uu page 12.)
If you are using the manual feed slot, see Loading paper in the

manual feed slot uu page 14.
 The paper tray may be too full. (See Loading paper uu page 12.)
 Check the paper type and quality. (See Acceptable paper and
other print media uu page 19.)
Check for loose objects such as torn paper inside the machine.

 Verify that the two green envelope levers inside the back cover
are set to the same position.
 Verify that the two grey Anti-Curl Levers inside the back cover are
set to the same position.