QMS Magicolor 330 Manual page 179

Cause
The paper being used
may have absorbed
moisture (perhaps due to
high humidity or having
water spilled on the paper
supply).
Print media is outside of
the recommended
specifications.
Cause
ICC color matching
disabled.
Colorific software not
installed, or
Monitor not calibrated.
Solution
Toner does not adhere
well to paper at the
positions where it has
become wet. Replace
the paper in the tray or
cassette with dry paper,
and retest for irregular
print.
Replace the print media
with a recommended
type.
Solution
Enable ICC color
matching in printer driver.
Install Colorific and
calibrate monitor.