Question about Brother MFC 7420 All-In-One Laser Printer

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Brother Laser Printer MFC-7420

Says Close the Back Cover Door. Ony it's allready Closed. AND, it was never opened in the first place????

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  • ALAN rodgers Apr 30, 2007

    Since that message came up, now it's stuck and won't do anything, right...

  • mtsinc Jan 08, 2008

    I went to fax something and got the message back door open. I had not opened the back door. Didnt even know there was one. I opened it and closed nothing happened. Now can't print anything or of course get my faxes.

  • Anonymous Feb 21, 2008

    Back door sensor not working

  • kava Mar 05, 2008

    message says to close back cover door - its already closed!! What do I do?

  • Anonymous Mar 11, 2008

    PLEASE CLOSE BACK COVER AND IT'S CLOSED

  • Anonymous May 19, 2008

    it is written back cover opened but it is not

  • gottapass3 May 19, 2008

    I have already tried to turn around the printer to see if there was any open slots and there wasn't. I can't figure out how to fix it.

  • Anonymous May 29, 2008

    dont know where the back cover is located

  • Anonymous Jun 11, 2008

    my printer is a dcp 7020 laser printer and it has a problem saying that the back cover open,close back cover what can i do to solve that problem

  • 2mutch Jun 15, 2008

    Have a brother MFC 7420 and the message "Back cover open - close back cover". The back cover is closed and I cannot do anything.

  • Anonymous Jun 19, 2008

    Brother Laser Printer MFC-7420 problem

  • martinfried Jun 22, 2008

    back door open message wont go away and cant use the MFC7420

  • aolalde Jul 06, 2008

    Display Back Cover Open


  • Anonymous Jul 08, 2008

    power went down during a print job and now my MFC-7420 says back cover door open. I have removed a paper jam, removed the paper tray

  • Anonymous Jul 16, 2008

    DITTO TO WHAT YOU'VE ALREADY SAID; CAN'T MAKE THIS MESSAGE GO AWAY AND CAN'T GET MACHINE TO WORK.



    THANKS, 1186

  • mrmjf Jul 17, 2008

    Me too - back cover open message. I found that there was a sheet part fed to the output slot. I had had to switch off the power as the input feeder crunched up a thin original. The sheet was under the top cover.




  • minirest Jul 26, 2008

    paper was jammed, back cover closed still get message back cover open.

  • erinfinneran Aug 25, 2008

    same problem exactly

  • yaelz88 Feb 11, 2009

    it is written: back cover open please close the back cover..

    I don't know which part of the printer is open. please help me to

    yaelz88@gmail.com

  • vetkhoa Feb 17, 2009

    The lcd displayed "back cover open. Close the back cover". How could i solve this problem (Brother MFC 7420). thks

  • bcs8 Feb 19, 2009

    I have same problem back door open when it is closed with a paper jam. have checked the lever on the spindle, it is in place remove the jam and it starts up again as soon as paper gets about 3 - 4 cms through orange roller it stops with door open error.. any help appreciated.

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17 Answers

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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 landis1471@comcast.net

Posted on Jan 26, 2008

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MY PRINTER ACTUALLY HAD A PAPER JAM BUT IT SAID BACK COVER IS OPEN INSTEAD WHICH SENT ME ON THIS WILD GOOSE CHASE. THE FUNNY THING WAS, I HAD TO REMOVE THE PACKING TAPE THAT THE PRINTER ORIGINALLY CAME WITH JUST TO CHECK IF THE BACK COVER WAS OPEN.
OH BROTHER!

Posted on Jun 05, 2008

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I found no sensors. But upon removing the back door and paper tray, I found that there is an internal (black) tray that is holding in a drum and toner cartridge.
Open this up toward you and find a spring loaded arm that runs from the right side toward the center. In my case this appeared to be bent. As I looked closer there where parts of this arm that were not fully inserted into corresponding gaps on the tray. I removed the screws for this but I don't know if I had to. If you do, be careful not to lose the spring that hooks on the right screw.
There's alot of tension on that arm but I just pushed it back into place. A poor design- a single paper jam knocks it out. Call the manuf. and they act as if buying another $300 printer is your only option. This is the #2 problem on the support site, yet there's no solution.

Posted on Jan 08, 2008

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For me, the spring tension was OK, but the thin rod shifted left by a few millimeters during a paper jam (and thus, did no more cross the optical sensor to the right side wall).
There are marks and windows in the black plastic piece that holds the rod so you can re-position it back in place (just bend it slightly). Just check the sensor is aligned with the rod digit and it's OK.
Anyway thanks to landis1471, as he almost solved my issue.

Posted on Aug 08, 2009

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Open the back cover and pull it out of printer .Inside you will find a black carrier for the paper to deliver it to the top part of the printer . Pull it down and dislodge the left side then pull off the right . On this black carrier is a plastic rod which has a lever to the right . This activates the sensor on the right side of the printer . There is a small spring located on the plastic rod which needs to be re-tensioned as much as you can then put it back in . Replace the black carrier and finally the back door . If your still having problems you may need to find a stronger spring and replace . Good luck :-)

Posted on Jul 14, 2009

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Landis1471


Your solution worked, I tapped the spring in place. It was out of place by a tiny fraction. Thank you!!

gc

Posted on Jun 02, 2008

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Paper was jammed!!!!!!!!!!! Take the jammed paper out and it it will all right!

Posted on Nov 15, 2008

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Another problem is the small rail has a lever that should go through a slot in the middle of the black carriage and may dislodge (sideways from that slot during a paper jam. Once you start looking at the gear referred to above, it is pretty obvious. The whole point is that Brother printers are cheap and somewhat prone to these sorts of problems and it seems this assembly is particularly so. The other problem I have encountered relates to resetting the counter when you change the drum (see elsewhere). Motto of the story: look at the interweb when you get a persistent error message that doesn't make sense.

Posted on Jul 07, 2010

I found a hammer worked for me, but i have anger management problems so it may not be suitable for you. regards damien

Posted on Nov 10, 2008

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Following paper jam, display showed message "Back Door Open", but it was not. I opened the back door and black tray, being careful not to dislodge spring, saw another sheet of paper not visible from front of printer and removed this. Problem fixed. chloe29

Posted on Oct 02, 2008

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Thanks Landis1471!! You just saved me lotsa bucks and all the hassle of setting up a new MFC.

Cheers

Posted on Sep 26, 2008

"MY PRINTER ACTUALLY HAD A PAPER JAM BUT IT SAID BACK COVER IS OPEN INSTEAD WHICH SENT ME ON THIS WILD GOOSE CHASE. " - Same here.

Posted on Jun 10, 2008

What a POSitive company Brother is. Actually, the solution is simple but tricky. There is a little black post sticking out of the bottom of the flimsy cross rail that comes out of its slot on the black plastic piece that it is attached to. This prevents the sensor from going into position when the cover is shut. The sensor is on the right side. I took the gray cover off to see this.

Posted on Jun 06, 2008

I found a paper stuck towards the back cover which caused this problem

Posted on Oct 02, 2007

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There is a switch that senses the 'Back door' open/ closed state Open the door and locate the switch - are the connectors both in place - if they are and they are of the push on type - pull them off and replace and work back forth a few times see what happens if you still get the message this suggests a switch failure - you could perhaps then short the wires together. Also take a look www.fixyourownprinter.com

Posted on May 19, 2007

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It seems to me that the error system is junk and picks up error signals / settings and puts them in a ramdom signal generator.

Try ..

Disconnecting from mains power.
then
Opening / removing every hatch, door, cover or item that you can remove with safety to you and the machine. Include the drum and other odds and sods inside.

Reassemble and re-test.

... a totally untested scheme use at your own risk.

Posted on Oct 03, 2008

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CCIF1024. I also took your advice and it worked perfectly. I just wish that I cam across this site before spending over an hour working on the problem myself.

www.abtermpapers.com
www.termpaperpeople.com
www.007math.com

Posted on Jul 13, 2008

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My brother mfc 7420 says that the back cover is open


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