Brother DCP-L2531DW, Online User'S Manual, Page: 493 / 658

Examples of poor print quality Recommendation
• Clean the drum unit.
• Replace the drum unit with a new drum unit.
• Replace the toner cartridge with a new toner cartridge.
• The fuser unit may be contaminated.
Contact Brother customer service.
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
Toner specks
• Make sure the media type setting in the driver
matches the type of paper you are using.
• Clean the 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.
• The fuser unit may be contaminated.
Contact Brother customer service.
Hollow print
• Select Thick Paper mode in the printer driver or use
thinner paper than you are currently using.
• Select the appropriate media type in the menu setting.
• Check the machine’s environment. Conditions such as
high humidity can cause hollow print.
• The drum unit may be damaged.
Replace the drum unit with a new drum unit.
All black
• Clean the corona wire inside the drum unit.
• The drum unit may be damaged.
Replace the drum unit with a new drum unit.
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
White lines across the page
• Select the appropriate media type in the printer driver.
• Select the appropriate media type in the menu setting.
• The problem may disappear by itself. Print multiple
blank pages to clear this problem, especially if the
machine has not been used for a long time.
• Clean the drum unit.
• The drum unit may be damaged.
Replace the drum unit with a new drum unit.
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
Lines across the page
• Clean the drum unit.
• The drum unit may be damaged.
Replace the drum unit with a new drum unit.
• Check the machine's environment. Conditions such as
high humidity and high temperatures may cause this
print quality problem.
• Clean the drum unit.
• If the problem is not solved after printing a few pages,
replace the drum unit with a new drum unit.
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