Brother HL-1435 User Manual page 89

Examples of poor print
quality
94 mm
(3.7 in.)
94 mm
(3.7 in.)
White Spots on black text
and graphics at 94 mm
(3.7 in.) intervals
94 mm
(3.7 in.)
94 mm
(3.7 in.)
Black Spots at 94 mm
(3.7 in.) intervals
6 - 12 TROUBLESHOOTING
Recommendation
If the problem is not solved after printing a few pages, the drum unit may have
glue from label stock on the OPC drum surface.
Clean the drum unit as follows:
1
Position the print sample in front of the drum unit, and find the exact position
of the poor print.
2
Turn the drum unit gear by hand while looking at the surface of the OPC
drum.
3
When you find the mark on the drum that matches the print sample, wipe the
surface of the OPC drum with a cotton swab until the dust or paper powder
on the surface comes off.
Caution
Do not try to clean the surface of the photosensitive drum with a sharp
object, such as a ball-point pen.
The drum unit may be damaged. Put in a new drum unit. See Replacing the
drum unit on page 5-9.