I have a brother MFC 7820n that is giving me a lot of trouble. It will pick up the first piece of paper without any trouble but the second will roll backwards and somehow block the printer from picking up any more paper. I have cleaned all the pickup and separation rollers even to the point of nearly removing them to completely clean them as well as cleaning the separation pad. It will pick up the first sheet of paper without a problem but will somehow screw up the second. It appears like the second sheet of paper gets fed back into the paper tray instead of getting pushed up into the printer. The printer does also make some noise that I would contribute to it being dirty. The printer is in the office of a grain elevator so dust is constant and unpreventable. I can't think of a better way to describe what it is doing but I will do my best to answer questions as best I can and I will take any suggestions you guys have.