Remove drum unit. in front of the toner cart. there is ether a green or blue slide lever. move the slide 10-15 times back and forth. make sher the slide is all the way over to one side. reinstall drum & make a copie. hope this works.
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Clean the corona wire on your drum unit. It should be a blue tab on the top of the cartridge that you can slide from side to side. Make sure that the blue tab returns to the starting position (there should be an arrow on the tab that will match up with an arrow on the drum unit). If this doesn't work, replacing the drum unit should fix it. Drum units are only meant to last ~4 toner section replacements.
sounds like you are using generic drum and toner. try OEM (brother brand). you say copies are coming out completely gray. try printing an internal report from the control panel. if that is gray or received faxes are gray, then the problem is not in your scanner area, and i would wager you are using "generic" supplies.
Problem is ambiguious but print out a report from your machine and if it comes out black, it is likey a toner cartridge problem. But if its OK make sure your scanner lamp comes on when reading the original