What sort of documents?
Texts or images or both.
Certainly reinstalling software is one option.
Also are you certain the lines are 'Printed' as opposed as is more likely- an indicator that the Waste Ink chamber is full and ink is leaking out andmarking the paper guides- The waste ink chamber is under the machine in a plastic tank- you will see where becuaew the rest of the machine will have a metal base.
click here- will have details
simply look up the printer model.
Its a messy job- taking out the pads -washing drying and reinstalling - take lots of precautions like doing it in the garden and not the on the best Dralon