The lines are more than likely caused by either the Drum, Developer or Fuser unit. I have found in many cases that if non genuine toner is being used this will give you poor quality images. You can try using genuine toner which may resolve your issue but you may have to run a few hundred prints to clear out the old toner before the image improves.
SOURCE: change drum kyocera fs-3900
open printer front cover and remove drum unite ,two side screw open two side spring **** two side open drum
if you are not possible it then buy a new one unite in your service authorized delar
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