A possible cause may be that appropriate paper is not used or there is a problem with the side of paper on which printing is performed. Check the following.
Are you using appropriate paper?
Check usable paper, and replace with appropriate paper.
Is printing performed on the proper side of paper?
In some paper types, one side is suitable for printing but the other side, not suitable. If the resulting print quality is poor, try printing on the opposite side of paper.
