Panasonic KX-P8410 Operating Instructions Manual page 122

Care and Maintenance
122
Trouble
Dark and wavy vertical
streaks appear in all
colors.
The entire page prints in
black, including the
borders.
Toner spots appear on
the back of the media.
The page prints in black
in the image area only.
(The borders are clear.)
Possible Cause
The main charge grid is
dirty.
Bad electrical contact for
the main charge grid.
The main charge grid is
broken.
The transfer unit is worn
out.
Either the image
processor board or
engine control board is
not functioning properly.
Corrective Action
Replace the imaging unit.
Reinsert the imaging unit
to correct the contact for
the main charge grid.
Replace the imaging unit.
Replace the transfer unit.
Turn the printer off and
back on again. If the
problem persists, call for
service on your printer.