HP LaserJet P2015 - Manual (Page 103)

Vertical lines
The photosensitive drum inside the print cartridge has probably
been scratched. Install a new HP print cartridge. See
Replace
the print cartridge for instructions.
Gray background
● Make sure that tray 1 is in place.
● Decrease the print density setting through
HP ToolboxFX or the embedded Web server. This
decreases the amount of background shading. See
HP ToolboxFX .
● Change the media to a lighter basis weight. See
Supported paper and other media for more information.
● Check the printer's environment. Very dry (low humidity)
conditions can increase the amount of background
shading.
● Install a new HP print cartridge. See Replace the print
cartridge for instructions.
Toner smear
● If toner smears appear on the leading edge of the media,
the media guides might be dirty. Wipe the media guides
with a dry, lint-free cloth. See
Clean the printer for more
information.
● Check the media type and quality.
● Try installing a new HP print cartridge. See Replace the
print cartridge for instructions.
● The fuser temperature might be too low. In your printer
driver, make sure the appropriate media type is selected.
ENWW Improve print quality 93