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Turn off your printer.
Open the back cover
Slam it shut - not hard enough to break it
Turn on printer
If you still have error, you most likely have a defective sensor for the back cover and will take a professional repair.
I found the following post on another site. It appears to work.
If you want to reset your Brother MFC 7820N machine so you no longer have the error message: Toner End of Life, do the following:
1. Open the front cover of the 7820N, that is, the cover that allows you to pull out the toner and drum, but don't pull out the drum/toner. 2. Push the button: Options (located on the left of the control pad). 3. Type: *00 on the keypad.
The Brother MFC 7820N should be reset and the Toner End of Life message should disappear.
WARNING: This may void your warranty and ultimately damage your machine if you are reusing or refilling your cartridges, but you should already know that. Hope this helps.
The "back cover open" message is usually caused by a paper jam inside the printer.
Follow these steps to rectify the problem.
1. Unplug the power to the printer.
2. Open the back and front cover.
3. Remove the drum and toner, this may be difficult because it may be stuck; don't be afraid to pull hard, you wont break anything.
4. Check for any foreign objects, most likely a peice of paper.
5. Reinstall the drum and toner.
6. Make sure to close the front and back covers.
7. Turn the power back on.
If the message stays after all this, there may be a sensor not working.
There is a little cover there that has a sensor flag on it. It is most likely in a jammed position. If you are able to carefully take the cover out, you can bend it slightly, readjust the sensor flag, and reinstall it.
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.
There is a little black lever in the middle that needs to be re inserted properly. (like a little black stick in the middle. Needs to slide to the left or right. See more of this one the site. It solved it for me.
I've been researching this problem. 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.
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