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.