Make sure that the priority input tray is in place.
Decrease the print density setting by using the HP toolbox. This decreases the amount of
background shading. See the device software Help for more information.
Change the media to a lighter basis weight. See
Device media specifications
Check the device environment. Very dry (low humidity) conditions can increase the
amount of background shading.
Install a new HP print cartridge. See the start guide for instructions.