Brother HL-1800 Series User Manual page 165

Image Defect Examples
94 mm
(3.7 in.)
94 mm
(3.7 in.)
White Spots
Printed pages have white spots in black
text and graphics at intervals of 94 mm
(3.7 in.).
94 mm
(3.7 in.)
94 mm
(3.7 in.)
Printed pages have black spots at
intervals of 94 mm (3.7 in.).
Recommendation
!
Caution
Do not try to clean the surface of the drum with anything sharp, such
as a ballpoint pen.
•
The drum unit may be damaged. Put in a new drum unit.
"Replacing the drum unit" in Chapter 5.
6-26
See