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Disassembly and troubleshooting guides for the MFC-7820N, an all in one printer with a scanner, manufactured by Brother. It has been discontinued.

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Why does my printer say back door is open

Why does my printer say back door is open when it’s not

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Check for broken tabs or a loose ground cable. I had a Brother color MFC laser (which I couldn't afford to own in my teens despite REALLY wanting to see color through). That fixed it on that one, but it may not work on yours as color printers are sometimes built differently than mono models.

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