Brother HL-5470DWT - Manual (Page 160)

154
Troubleshooting
6
White Spots on black text and
graphics at 3.7 in. (94 mm)
intervals
Black Spots at 3.7 in. (94 mm)
intervals
 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.
uu Cleaning the drum unit uu page 120
 The drum unit may be damaged. Put in a new drum unit.
uu Replacing the drum unit uu page 111
Black toner marks across the
page
 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.
uu Cleaning the drum unit uu page 120
 Make sure that you use paper that meets our specifications.
uu Acceptable paper and other print media uu page 2
 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.
 The toner cartridge may be damaged. Put in a new toner cartridge.
uu
Replacing the toner cartridge uu page 104
 The drum unit may be damaged. Put in a new drum unit.
uu
Replacing the drum unit uu page 111
Examples of poor print quality Recommendation
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4