Konica Minolta BIZHUB C20 User Manual page 299

Symptom
Abnormal
areas (white,
black, or
color) appear
in a regular
pattern.
Image
defects.
Lateral lines
or bands
appear on
image.
Colors look
drastically
wrong.
Solving Problems with Printing Quality
Cause
The laser lens is dirty. Clean the laser lens.
A toner cartridge may
be defective.
One or more of the
imaging units is
defective.
The laser lens is dirty. Clean the laser lens.
A toner cartridge may
be leaking.
A toner cartridge may
be defective.
One or more of the
imaging units may be
defective.
The machine is not
level.
The media path is
dirty with toner.
One or more of the
toner cartridges may
be defective.
One or more of the
imaging units is
defective.
One or more of the
toner cartridges may
be defective.
Solution
Remove the toner cartridges with the
color causing the abnormal image.
Replace it with a new toner cartridge.
Remove the imaging units and check
for damage. If it is damaged, replace it.
Remove the toner cartridges and
check for damage. If it is damaged,
replace it.
Remove the toner cartridge with the
color causing the abnormal image.
Replace it with a new toner cartridge.
Remove the imaging units and check
for damage. If it is damaged, replace it.
Place the machine on a flat, hard, level
surface.
Print several sheets and the excess
toner should disappear.
Remove the toner cartridges and
check for damage. If it is damaged,
replace it.
Remove the imaging units and check
for damage. If it is damaged, replace it.
Remove the toner cartridges and verify
that the toner is distributed evenly on
each cartridge roller, and reinstall the
toner cartridges.
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