Black is not Fusing sometimes. The First pic is the test chart with only black and is just fine. The Next one is B&W test chart copied in full color. The next pic is toner curve B&W and the next is the color test chart copied in color. (You can see where Black is not fusing) I reset factory defaults. I changed fuser and the heater. The toner that is in the machine is the OEM I sold them.Just when I think I have these machines figured out then this occures. Thanks so much for any help !!
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