Toner provides the color, Developer consists of magnetic particles that carry the color on the outside of the developer drum, which is magnetic. Some developer is lost on each copy, although most stays in the developer unit. When you run low on developer, your image gets lighter and lighter, until the machine reports an error because it can no longer self calibrate. One change of developer suffices for many changes of toner. There is a procedure involving various actions and codes to flush the developer material out and load new developer in. This is not difficult, but there are a couple of reasons you might not want to do it if you are unsure why or if you should. First, developer for these estudio copiers, is very expensive. Second, unless you know how many copies have been made on the existing developer, you might change the developer, and fail to correct the problem. There are related service items, involving the cleaning blades, and seals, servicing charging grids, corona wire, and general cleaning of the 4 developer units and opc drums. Including dusting with zinc sterate, etc., etc. Its hard to know where to begin or where to stop. If you really want to know all about it, order a manual from any of a variety of on-line sources. Good luck
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