I have a Brother MFC 8840D laser mutifunction copier/fax. I have an error message of "doc cover open" after removing a jammed document through the top feeder. I have checked that there is no papers stuck in copier feeder, but I cannot get the message to clear. I have turned the unit off and on and I cannot clear the message error. Please assist.
I had the same problem with mine. Lift the top scanner, and check the hinges on the left. That error message means that the little black sensor on the left next to the hinges is not meeting flat with the unit when closed. Hold the sensor in for a few seconds, and your printer will start working properly.
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With my Brother 8840D I have had paper jams that when cleared would not delete from the display nor would the machine operate until I unplugged the machine for around eight hours. I guess it is a sort of reset or reboot.
If you mean the top left of the doc. feeder, you remove the cover by flexing slightly, remove a phillips screw, lift the scanner cover and there's a square hole on the lid with one of those flex clip retainers that you use a screwdriver to lift.
That error happens when the left hinge in the back breaks and the scanner cover won't shut all the way. temporarily you can tape the switch that is above the hinge and when the error is gone the modes should change again. The hinge is #LP2403001.