Question about Brother MFC 7420 All-In-One Laser Printer
My printer, a Brother MFC-7420, had a paper jam, which was completely cleared, and now I can't get rid of the "back door open" message. I know it's the sensor, but where specifically is the sensor? This has been a great printer and I really don't want to lose it. Please help!
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!.
Posted on Aug 11, 2008
After playing with this forever, I saw one on the post above that sent me on the right path. Open the back cover. Inside you will see another black flap that can be pulled down. On this flap is a little rod that goes from middle to right side. This rod on my printer has a little piece/flap in the middle that fits into a groove and it jumped out. I moved it back into the groove and closed back door. Now prints great with no error message.
Posted on Apr 13, 2015
The notation describing the sensor on the flap seems to be correct.
Just got my unit working but I am hanging on to my HL 2040 as a
back-up. This printer seems to be very delicate and my expectations is
that it will likely be a short lived relationship. Fortunately some of
the parts are interchangeable and I can maybe extend the life of my
2040 printer if I start monkeying around with this.
Good luck -- very frustrating -- I am amazed that Brother would put out something so flimsy and that with the number of problems they cannot guide you through the solution.
Posted on Sep 03, 2009
Take printer and throw out second story window.
Posted on Oct 16, 2008
Been looking for 4 days now, still have not found a sollution!
really what a stupid machine, 1 small sensor of lever is broken and renders the entire machine useless.
well, gonna walk away and try again in a couple of min....
Posted on Mar 28, 2008
Look at each doors, there will be a protruding piece of plastic on the door usually in the left side, look where it goes in the machine there is a switch there that you can here when you press on it ( sometimes it is a photo sensor in that case you have to put a piece of paper to in that hole to activate it, maybe it got knocked out of place) it may be that the lever to that switch needs adjisting to make it trigger again.
Posted on Oct 11, 2007
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