Brother HL Series User Manual page 119

Troubleshooting
Examples of poor print
quality
94 mm
(3.71 in.)
94 mm
(3.71 in.)
White Spots on black text
and graphics at 94 mm
(3.71 in.) intervals
94 mm
(3.71 in.)
94 mm
(3.71 in.)
Black Spots at 94 mm
(3.71 in.) intervals
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
Black toner marks across the
page
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.
Recommendation
 If the problem is not solved after printing a few pages, the drum unit may have
foreign material, such as glue from a label, stuck on the drum. Clean the drum
unit. (See Cleaning the drum unit on page 87)
 The drum unit may be damaged. Put in a new drum unit. See Replacing the drum
unit on page 79.
 The drum unit may be damaged. Put in a new drum unit. See Replacing the drum
unit on page 79.
 The toner cartridge may be damaged. Put in a new toner cartridge. See
Replacing the toner cartridge on page 71.
 Make sure that you use paper that meets our specifications. See Acceptable
paper and other print media on page 3.
 If you use label sheets for laser printers, the glue from the sheets may sometimes
stick to the OPC drum surface. Clean the drum unit. See Cleaning the drum unit
on page 87.
 Do not use paper that has clips or staples because they will scratch the surface
of the drum.
 If the unpacked drum unit is in direct sunlight or room light, the unit may be
damaged.
 Clean the primary corona wire inside the drum unit by sliding the green tab. See
Cleaning the corona wire on page 85.
 Make sure the green tab of the primary 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 on page 79.
 The toner cartridge may be damaged. Put in a new toner cartridge. See
Replacing the toner cartridge on page 71.
 The fuser unit may be contaminated. Call your dealer or Brother Customer
Service.
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