work with printheads and ink cartridges
As you discovered when you installed your HP Officejet, the ink delivery system
consists of both ink cartridges, which contain the ink, and printheads, which
control the print quality. To ensure the best print quality from your HP Officejet,
you well need to preform some simple maintenance procedures, and when
prompted by a front-panel message, replace the ink cartridges or printheads.