Oki B412dn User Manual - page 271
Other manuals for B412dn:
Maintenance Manual
of
637
Black or White Dots Appear
Cause
Solution
Reference
The paper is unsuitable.
Use recommended paper.
If the intervals of lines or spots are approximately 94 mm
(3.7 inches), the green tube of the image drum is damaged or dirty.
Lightly wipe the image drum
with a soft tissue paper.
Replace the image drum if it
is damaged.
270