Step 1 – Turn off the printer.
Step 2 – Open the front cover of your Brother laser printer/MFC and make sure it remains that way thorough the whole procedures.
Step 3 – Press & hold the Go button while turning on the printer. All LEDs turn on and the Ready LED will turn off.
Step 4 – When the Ready LED turns off, release the Go button. All LEDs will turn off.
Step 5 – Press the GO button 2 times (Toner, Drum, and Error LEDs turn on).
Step 6 – Press the GO button 7 times. All LEDs turn off and then the Error LED will turn on.
Step 7 - When the Error LED stays on, close the front cover. The Error LED will turn off and the Ready LED will flash briefly.
Step 8 – Verify the Ready LED is on steady and the Toner LED is off. Once done, it should work.