My brother mfc 7420 says that the back cover is open

SOURCE: Brother Laser Printer MFC-7420

Ok I fixed this problem. It has to do with Tension on the rod inside the back cover. Open the back cover and remove it. Then emove the black plastic piece by un hooking it on the left side and pull it down then toward you. You will see a rod attached to it that runs to the right. The right end of the rod has a lever that travels in a slot on the right side of the printer. There is a small spring on the rod. Here lies your problem. There has to be enough tension on this spring to activate a switch in the slot on the right side of the printer. Make sure the spring is installed properly. This is a low tension spring so nothing will come flying out when you remoe it and re install it properly. A piece of paper can dislodge this spring. When you get it apart you can quickly see how it should be put back in. E-mail me if you need further help [email protected]

SOURCE: Refill toner Brother MFC 7420

open front cover, press OPTION button, on the LCD will appear a message "NEW DRUM?" ....DO NOT RESPOND....just type on the keyboard "*00" and there will appear a message "Accepted" and use it in your pleasure.

PS. in any case i blocked with paper labels the viewing windows from transparent plastic on the toner itself....

Mr. Brother, do not try to be smarter than your customer

SOURCE: I can't find the back door sensor on Brother MFC-7420

I have the answer. I just fixed mine. The sensor is not really on the door. You have to remove the door by openning it all the way and carefully sliding it out ( one of the pegs holding the door is hourglass shaped. This will slide out first. The other is round. You will see a black flap that covers a red drum. Pull the flap down carefully. There will be a six inch long rod it's about 1/8 of an inch in diameter. It extends from the middle of the flap all the way to the right side. This probably popped out of place. Make sure that it is all the way to the right as this is where the sensor is. There is a little spring on the bar on the left side. This should be straight up and down. if it is not, then you need to fiddle with the bar.
The trick was that the sensor is NOT on the door, but on this inner flap. When the door closes it pushes this flap agains the drum and the little bar activates the sensor.
Please do not applaud so loud, you are ambarrazing me!!! hehehe. Good luck!.

SOURCE: error 2001 on brother mfc 7420

please tell me more! i just checked my brother manual and i do not see a error code 2001????????????

SOURCE: Brother MFC 7420 keeps saying - back cover open -

First be sure you close the back cover and remove all the jammed paper. after that, turn off your printer for 1 min to see is it okie.