My Epson lpq 20 printer gives dark shade along with printed area. How to avoid dark shade?

sir, when printed test page with A4 sheet,print is clear but there is a shade over printed lines ,ie like selection...i checked the head,the roller near head is too tight and too much ink on it?the shade appear when i just put a paper in for test it print only one line in bottom, but shade appeared in middle of a4 sheet.the print can be viewable from back side of A4. sir, when printed test page with A4 sheet,print is clear but there is a shade over printed lines ,ie like selection...i checked the head,the roller near head is too tight and too much ink on it?the shade appear when i just put a paper in for test it print only one line in bottom, but shade appeared in middle of a4 sheet.the print can be viewable from back side of A4.

if you are using refilled or overfilled or not epson quality ink,this will happen,take the ink out and wipe them down with a baby wipe only where the ink is,then replace and clean the heads with your computer software,if you dont have epson print utilities then you need to get it to clean and align the heads if you are using refilled or overfilled or not epson quality ink,this will happen,take the ink out and wipe them down with a baby wipe only where the ink is,then replace and clean the heads with your computer software,if you dont have epson print utilities then you need to get it to clean and align the heads