Originally Posted by
empiru
Splatt, if I were you, first of all, I will try to see if those lines appear on plain paper as well as on thick paper. If they don't appear on plain paper, then my guess is that you don't have any issues with the Tr. Belt/ Dev Units/ Drums. The problem could be in the Fusing Unit, the Fusing Belt or the Fusing Roller/ Lower could be damaged, OR, the plastic guides on the Paper Exit Guide Section may be clogged with toner (the part that is located on the left side of the Fusing Unit and is made mainly out of plastics). You could check that out too.
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