Konica Minolta magicolor 4750EN/4750DN User Manual page 240

Symptom
There are
toner
smudges or
residual
images.
There are
toner
smudges on
the back side
of the page
(whether or
not it has
been
duplexed).
Abnormal
areas (white,
black, or
color) appear
in a regular
pattern.
Solving Problems with Printing Quality
Cause
One or more of the
imaging units may be
defective or installed
incorrectly.
The media path is
dirty with toner.
One or more of the
imaging units may be
defective.
The laser lens is dirty. Clean the laser lens.
A imaging unit may
be defective.
Solution
Remove the imaging units and check
them for damage. If one is damaged,
replace it.
Print several blank sheets and the
excess toner should disappear.
Remove the imaging units and check it
for damage. If it is damaged, replace it.
Remove the imaging unit with the color
causing the abnormal image. Replace
it with a new imaging unit.
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