When making 2-sided (using duplex) copies the second side is light. If i make a copy and then when use bypass to make a copy at the back side , image is also light . I believe it has something to do with ground . I suppose when coping the first side static electricity remains on paper so when copier prints on the other side this electricity doesn't allow toner to get on paper. If i make an one sided copy and after some time print on the other side copy is ok. This problem appeared after i made some work on the back side of the copier but i have double checked everything , i compared with others copier and looks ok. I replaced spong roller , checked grounds , with no result.I haven't use this machine for some time but now i want to sell it. Any idea?
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