Have a brother MFC 7420 multi function Machine. Keep getting signal on screen stating ''Back Door Open'' it is not have cleaned, everything suggested still same. can you help ?
The back door sensor is damaged. You could could try and close and re-close the door over and over until it registers, replace or bypass the sensor, or buy a new printer. Brothers printers are pretty cheap, depending on what your time is worth per/hour, I'd would just replace it rather than waste a lot of time.
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