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Re: message on brother MFC7420 "back door open" when it's...
Actually, you need to double check the back cover and front cover, open them all to check all paper jam.
Besure to check the back cover, normally all paper jam is from the back.
be sure to close the front cover at the last cover to close.
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Paper Jams are routinely caused by bad roller in the printer. The Heat of laser printers can render these rubber roller pretty useless in a couple of years or less if you print often. If you have recently replaced the drum (according to the recommended print output number), Then If an $80 dollar roller + labor is worth it to you, go for it, otherwise buy a new printer and Brother gives the best ink value per page. hope this helps.
This is a huge problem, not only with the MFC-7420 printer, but literally every printer known to exist! The best way to solve this problem is to look at where the printer is connected. If it's connected to your computer, it may be trying to print something from there still, causing the information that the printer is receiving to become jumbled up and confused. I'm going to go step by step to try to help you out of your printer misery:
First: Unplug the printer from your computer entirely. Then unplug your printer's power source. Second: Re-plug back in your printer's power source, and wait for it to turn on fully. Third: Double check to make sure everything is working fine aside from the non-existent "paper jam." Fourth: Re-plug back in the printer to the computer, and cancel all scheduled prints that are queued on your computer. Lastly: Retry printing!
First you need to clean up the drum and inside the printer.
after that if still jamming paper.
you better check all the rollers and check the drum unit.
if possible, please chang the drum and that should be working fine.
Take the toner cartrige out, look around with a flashlight for a piece of paper or something that could jam the works. Check the movable tab that comes out of the front of the machine to hold paper up, maybe it has gotten crooked or something. Don't have anything in front of the machine to block the paper coming out. A can of compressed air can be used to blow the machine out.
First you need to clean up your printer with duster and after thatn, check the toner and drum to see any paper jam or anything wrong,
Normally after you clean up the machine, should working fine,
if still not working, please replace the rubber roll.