Xerox Phaser 6121MFP User Manual page 192

Troubleshooting
Symptom
There are toner smudges on the
back side of the page (whether
or not it has been printed on
both sides).
Abnormal areas (white, black,
or color) appear in a regular
pattern.
Image defects.
Lateral lines or bands appear
on the image.
192 Phaser 6121MFP Multifunction Printer
User Guide
Cause
The paper path is dirty with
toner.
One or more of the toner
cartridges is defective.
The imaging unit may be
defective.
The printer's laser lens is dirty.
A toner cartridge may be
defective.
The imaging unit may be
defective.
The laser lens is dirty.
A toner cartridge may be
leaking or defective.
The imaging unit may be
defective.
The printer is not level.
The paper path is dirty with
toner.
One or more of the toner
cartridges may be defective.
The imaging unit may be
defective.
Solution
Print several blank sheets and the excess
toner should disappear.
Remove and inspect the toner
cartridges. Replace any that are
defective.
Remove the imaging unit and inspect it
for damage. If damaged, replace it.
Clean the laser lens. See Cleaning the
Laser Lens on page 168.
Remove and inspect the toner
cartridges. Replace any that are
defective.
Remove the imaging unit and inspect it
for damage. If damaged, replace it.
Clean the laser lens. See Cleaning the
Laser Lens on page 168.
Remove the toner cartridge with the
color causing the abnormal image.
Replace it with a new toner cartridge.
Remove the imaging unit and inspect it
for damage. If damaged, replace it.
Place the printer on a flat, hard, level
surface.
Print several blank sheets. The excess
toner should disappear.
Remove and inspect the toner
cartridges. Replace any that are
defective.
Remove the imaging unit and inspect it
for damage. If damaged, replace it.