Step 1: Unpack the new toner cartridge, hold the toner cartridge with both hands, keep it level, and gently shake it left and right several times to distribute the toner inside the toner cartridge evenly.
Step 2: Remove the protective cover.
Step 3: Insert the new toner cartridge firmly into the drum unit until it locks into place, the green locking lever will lift automatically when installed correctly.
Step 4: Put the drum unit and toner cartridge assembly back into the machine, close the front cover, and the replacement is complete.