Question about Brother MFC-7820N Laser Printer

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One more person with BACK COVER OPEN problem

I too cannot get the BACK COVER OPEN message to GO AWAY. Misery loves company I suppose. It seems that this is a common problem without obvious solutions. Please, somebody, HELP US so that we can print again!

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  • rerwerwe3d Apr 02, 2008

    I was able to ghetto rig the back black thingy using a letter opener inserted through the opening left by pulling out the paper tray and holding the black thingy in place while I slammed the back door shut.

  • Anonymous May 05, 2008

    same problem, the black thingy wont go into slot

    crappy product

  • lls_email Jun 20, 2008

    Problem with my Brother 7820N MFC Printer.
    After a jam, I've cleared all the paper and I can't get the message "Back Cover Open. Close the Back Cover." to go away. So I can't print.
    Here's what I've done so far:

    Taken everything out (paper tray, drum), opened every door etc, put it all back together, made sure the back door was closed. I've unplugged the power cord, turned it off, rebooted my computer also. Nothing yet has made the message go away.

    This did happen once before and I got it to go away (can't remember how!). I remember it was very stubborn, but I THOUGHT that restarting my computer had been the fix, but not now.


  • fabulosa Jul 01, 2008

    back cover open close the back cover

  • Anonymous Jul 03, 2008

    BROTHER MFC7820N

  • Edro Mar 24, 2009

    I just updated my firmware to the new M release (2/2009), and am getting the back door cover message any time I try to print a page. The paper stops in the fuser, and the message goes away whenever I remove the paper.

    The little black spring-loaded bar on the fuser door seems to be ok, since the error message does not appear when the door is closed and nothing is printing.

    I tried resetting the printer like AZ_CES suggested, but that didn't help me.

  • Anonymous Apr 25, 2009

    I had the same problem and solved it using the help on this site. Thank you.

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THANK-YOU Guest for #4. It works! And it seems like a miracle. It took me an hour of fumbling around with flashlight and reading glasses, but I was able to get my brother up and running again.

It's easiest if you remove the back cover completely. Putting it on the edge of a desk or table may make this easier. The door comes off on the left very easily. Just lift the top slotted arm off the peg and then the bottom left part comes off it's peg pretty easily.

Also the fuser cover comes down farther by pressing on the right blue plastic knob and gently pressing the right side of the fuser cover over it.

Then you can see the cylinder that #4 talks about. It lies horizontally in the middle of the fuser cover, about the size of a straw (smaller though). Mine was very obviously bowed and the little spine sticking up (about 1.5 inches long) was also obviously not aligned with a slot below it on the fuser cover.

By gently jiggling it, and particularly on the right side I jiggled it around very gently to push it to the right. (you can move it around a bit and get a feel for where it should be) It then seemed to settle in to the right better, the bowed tension was gone and the spine (or needle) fit right into the slot.

I gently put the fuser cover back up and closed the back door and my printer works.

THANK-YOU thank-you! thank-you a zillion.

(P.S. I tried to attach a photo but had problems with that. . . )


Posted on Jun 20, 2008

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Easy solution - once you open up the back cover, there is another smaller black cover that goes over the fuser - on the inside of this smaller cover is a spring loaded piece - this is the "back cover sensor" so to speak. Make sure this is aligned properly, if it doesn't rest in it's place you will forever get the back cover open message.

Posted on Nov 07, 2007

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I went to brother typed in the error, it came up with a solution, it told me to pull out the ink cartridge, and sure enough there was anothe piece of paper I had missed in the jam, I pulled it out put the ink back in and it now works fine

Posted on Mar 24, 2008

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I Had the Same Problem with a printer i got for free. I tried messing around with the back door sensor flag(spring loaded piece) but it seemed to be located correctly.

I believe the switch has dual purpose first to check for the back cover closed and to see when a paper has gone around the rollers. It would only give me the "back cover" error when a new paper was loaded and would go around the rollers. I would then remove this piece of paper and try again and it would give me the same error.

This lead me to believe that the sensor was working like it should and it could be a programming bug. I couldnt find a way to reset the printer so I took off the left side cover by removing one front and one back screw. (UNPLUG POWER OF COURSE) Then pulled each connector and plugged them back in. This seemed to reset the printer and now it works!!!!

Posted on Jan 11, 2009

I discovered that the long sensor rod was pushed out of place about 1/8" or 1/4" to the left. I noticed that there is a small tongue that fits in a slot about midway on the rod part, and it was misaligned. Once I pushed it to the right to align the toungue with the slot, it all worked again. Aargh, so frustrating.

Posted on Apr 05, 2008

See solution #1. A little bit more clarification:

The "spring loaded piece" mentioned is a black cylinder, about an eighth-inch in diameter, that runs about halfway across the black fuser cover mentioned. On it is a very slender spine. On the printer I looked at, the cylinder was noticeably bowed, and the spine was not fitting through the slots in a small metal shield in the fuser cover. Once I moved it so the spine aligned correctly, and closed everything up, the error went away.

Posted on Mar 05, 2008

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I've been researching this problem. You're right, it seems to be a common issue with this MFC. Apparently it's not only a known issue, but Brother has no fix for it outside of replacement.

Posted on Jun 04, 2007

  • Chris Yost
    Chris Yost Jun 06, 2007

    I'm sorry I wasn't able to be more help. But that's the answer I was able to glean from my research; it's a known issue and it's not repairable.

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