Question about Brother MFC-7820N Printer

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Back cover open will not go away ... even though back cover is closed!

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This is a common problem with the Brother 7820 printers. If you open the back cover, there is a black tray in front of the fuser roller that falls back. That black tray has an arm on the inside on one side that triggers the back cover open message. try pushing that tray up firmly against the back with the back cover open and see if the message disappears. If it does, try taping folded paper to the rails on inside of the grey back cover. The verital plastic rails are what push the black tray into the printer. By taping the paper on you are adding depth to them which will push the black tray further into the printer. If this doesn't work and you cannot get the message to go away from pushing on the black tray, there may be a problem with the trigger. If this were the case I would replace the printer. You can find the 7820 refurbished for $99 online. Just google 7820 refurb.

Posted on Apr 30, 2009

  • penzance13 Nov 10, 2010

    We had the same problem but nothing worked but then found the following.
    You will see the small black arm that is springloaeded it has 2 positions it can be in on the chute. It NEEDS to be on the 1 closest to the right so all you do is move the arm to the right and it slots into the correct position.
    Hope this helps

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Brother (photocopier, fax and scanner machine) says << back cover open. close back cover>> but the back cover (or at least what i think is the back cover) is closed. I even opened and closed it...


I have fixed this problem on my 7820n printer by brother.

open the back door, then inside there will be a black colored other kind of like door that pulls back away from the roller. on this inner door is a black long thin plastic lever that runs from about the center of the inner door to the right. on the right end of it is a lever that slides along a curved increase on the right side wall. when both doors are closed this right end of the rod or lever moves up to close the gap between what is the sensor. this long thin plastic rod had snapped out of place and when i snapped it back in making sure the spring was correctly installed on the left end of it and the middle part of the rod slid correctly in its groove...the right end of the lever correctly closed the gap on the sensor (when both doors are closed) and the back door open error went away.

So that's how you really fix it!!!!

James Hilliard - Totally super awesome guy! hee hee

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Had same problem. Closer inspection revealed bit of paper out of sight. Removed the toner cartridge and worked to free torn paper. Then restart. Hope it helps.

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I had the same problem, and the cause turned out to be the cover switch not being fully pushed in. On the underside right edge of the top cover, there's a little triangular protrusion that pushes down a black rectangular button (the cover switch) when the cover is closed. The problem occurs because the flimsy top cover is made of plastic and flexes slightly when you close it. This means that sometimes, the right edge of the cover won't seat properly even though it appears as if the cover is closed all the way. When this happens, the triangular protrusion isn't fully pressing the switch down.

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In my case, all I had to do the fix the problem was close the cover and make sure it was fully seated by firmly pressing down the right edge of the cover until I heard a plasticky "click" noise. After that, the problem went away.

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