How do I replace the imaging drum on the HP LaserJet Pro MFP M227?

Lift the scanner assembly, open the cartridge door, and temporarily remove the toner cartridge before extracting the used imaging drum. Install the new imaging drum by aligning it with the tracks inside the printer, reinstall the toner cartridge, close the cartridge door, and lower the scanner assembly. Do not touch the imaging drum surface, as fingerprints can cause print-quality problems. (Pages 40–43)