How do I replace the toner cartridge in the HP LaserJet Pro MFP M227?

To replace the toner cartridge, lift the scanner assembly, open the cartridge door, and remove the used toner cartridge. Insert the new cartridge by aligning it with the tracks inside the printer and pressing until firmly seated, then close the cartridge door and lower the scanner assembly. Be careful not to expose the new cartridge to light for more than a few minutes to prevent damage. (Pages 35–38)