HP LaserJet 9050 Printer series - Manual (Page 93)

ENWW Cleaning the printer 91
3 With a dry, lint-free cloth, wipe any residue from the paper path area, the registration roller,
and the print cartridge cavity.
4 Replace the print cartridge.
5 Turn the green lever back to the locked position.
6 Close the front cover, reconnect all cables, and turn the printer on.