OCE 7056 Toner Not Fusing To Paper

Question

I have an OCE 7056 wide format copier, I am the original owner and and error message 0501 occurred which meant to add toner, I have since then add non-oem toner and the error was removed from display panel. A new problem has come about that will not allow the toner to fuse to the paper in some areas of the sheet. Any sugguestion on how to remedy the fusing problem. OCE discontinued the copier and technical repair personnel are hard to find.
Thanks