Brother HL-L2357DW Online User's Manual page 177

Examples of poor print quality
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
A B C D E
a b c d e f g
A B C D
a b c d e
0 1 2 3 4
Image skewed
Curled or wavy image
abc efghijk
A
Wrinkles or creases
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Poor fixing
F G H
h i j k
B DEFGH
C D
b c d e
1 3 4
Recommendation
Replace the drum unit with a new drum unit.
• The fuser unit may be contaminated.
Contact Brother customer service.
• Make sure foreign material such as a torn piece of
paper, sticky notes or dust is not inside the machine
and around the toner cartridge and drum unit.
• The toner cartridge may be damaged.
Replace the toner cartridge with a new toner cartridge.
• The drum unit may be damaged.
Replace the drum unit with a new drum unit.
• Make sure the paper or other print media is loaded
correctly in the paper tray and the guides are not too
tight or too loose against the paper stack.
• Set the paper guides correctly.
• The paper tray may be too full.
• Check the paper type and quality.
• Check for loose objects such as torn paper inside the
machine.
• If the problem only occurs during automatic 2-sided
printing, check for torn paper in the 2-sided tray. Verify
the 2-sided tray is inserted completely and the back
cover is closed completely.
• Check the paper type and quality. High temperatures
and high humidity will cause paper to curl.
• If you do not use the machine often, the paper may
have been in the paper tray too long. Turn over the
stack of paper in the paper tray. Also, fan the paper
stack, and then rotate the paper 180° in the paper
tray.
• Open the back cover (face up output tray) to let the
printed paper exit onto the face up output tray.
• Choose Reduce Paper Curl mode in the printer driver
when you do not use our recommended print media.
• Make sure paper is loaded correctly.
• Check the paper type and quality.
• Turn over the stack of paper in the tray or rotate the
paper 180° in the input tray.
• Make sure the two green levers inside the back cover
are in the up position. Pull up the two green levers
until they stop.
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