4. Install the toner cartridge into the new drum unit until it locks into place, indicated by a click. When the toner cartridge is installed correctly, the lock lever is lifted automatically.
!Caution
Make sure that the toner cartridge is installed correctly, or the toner cartridge may separate from the drum unit when you hold the drum unit assembly.
X
5. Install the drum unit assembly into the printer.
Fig.
Make sure that the printer is turned on, the front cover is open and the Drum and Alarm LEDs are illuminated.