Traduciendo paso 2
Insert the toner cartridge into the new drum break by firmly sliding the cartridge into the drum unit. If installed correctly, the blue lever will be locked in a lifted position.
Be sure that the black nob located on the back of the toner cartridge is places inside the track located on the drum unit.
The third picture illustrates an incorrectly installed drum unit and toner cartridge, notice how the blue lever is down.