1. Open the top cover. 2. Slowly take out the drum unit and toner cartridge assembly; 3. Push down the lock lever (1) and take the toner cartridge out of the drum unit (2); 4. Unpack the new drum unit and put the toner cartridge firmly into the new drum unit until you hear it locks into place. If you put the cartridge in correctly, the lock on the drum unit will lift automatically.

1. Make sure that the machine is turned on.; 2. Open the front cover and leave the machine turned on for 10 minutes to cool down; 3. Take out the drum unit and toner cartridge assembly; 4. Push down the green lock lever and take the toner cartridge out of the drum unit; 5. Unpack the new drum unit.; 6. Put the toner cartridge firmly into the new drum unit until it locks into place. If you put the cartridge in properly, the green lock lever will lift automatically.

1. Make sure that the machine is turned on and the Drum LED is flashing. Leave the machine for at least 10 minutes to cool down; 2. Open the front cover; 3. Take out the drum unit and toner cartridge assembly; 4. Push down the green lock lever and take the toner cartridge out of the drum unit; 5. Unpack the new drum unit.

Eight Steps show you how to reset your Brother TN450: Step 1 – Turn off your Brother laser printer ormultifunction center; Step 2 – Open the front cover of your Brother laserprinter/MFC and make sure it remains that way through the whole procedures; Step 3 – Hold the go button while turning on your Brotherlaser printer/MFC. All LEDs turn on and the Ready LED will turn off;