Replacing the Toner CartridgeThis section describes how to recognize the replacement period of a toner cartridge, and how to replace the toner cartridge.When a toner cartridge nears the end of its lifetime, the "Toner Low" message is displayed. Have a new toner cartridge ready.When the "Toner Empty" message is displayed and printing stops, replace the toner cartridge.1. Open the scanner unit.2. Press the top cover open button.3. Open the top cover.4. Rotate the blue lever of the toner cartridge in the direction of the (Unlock) arrow until it stops.5. Remove the toner cartridge by lifting it gently.820