Hi good day! Have you checked the toner cylinder ?! These lines that are repeated is because the cylinder may be dirty or that it has a defect, it also checks inside the printer the band where the sheet passes, usually there is toner residue and it may be dirty to clean it. On the back open the door and bring a sponge-like cylinder that also cleaned well and you do tests. Try also to change the toner, because if it is a failure of the toner, what can cause you is that it can contaminate the other toner and will cause you more problems, comment on how your progress is going. Luck!