Machine is mx-m4070with 70k copies. Black build up in middle of the drum keeps coming back, ill post pictures of it. I cleaned it and it came back in a few days, then replaced the charge, cleaning blade, and drum cylinder and it came back after 2 weeks. Client is using noncarbon paper which I thought was the issue at first but the one he is using is specifically for laser printing. Im thinking of replacing the drum unit and developer unit but im not sure if that will fix it.
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