Since the black film of the transfer belt touch the back of the paper the only way for toner to get on the belt is there is toner on the drum on the toner cartridge for each color before paper is even picked up. That would indicate a possible hight voltage issue since it just a toner dump and not an actual image. As I said it could be many things and to throw parts at such a old and inexpensive printer does not make sense when you can purchase one in working condition on ebay for less then 100.00.
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