“Missing characters/Lines through text
Some video drivers may cause a conflict in memory between the printer driver and video memory. Try changing to the Windows video driver provided by Microsoft or check to see if the video card manufacturer has an updated video driver available. This is often the cause of strange printing problems such as missing characters or lines through through the printed document.
Broken printhead pins may also cause this problem. If the problem continues when performing the printer's self test then the printhead is most likely the problem. This would need to be serviced by an Epson authorized repair center.”
I was referring to the second problem. The first problem may be the one you are having.
Also see http://files.support.epson.com/pdf/ap3250/ap3250ps.pdf.