Oki ES4192dn User Manual - page 623
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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.
The document glass or document holding pad is dirty.
Clean the document glass
and document holding pad.
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