Adjust Print Quality : Align the Print Head

Align the Print Head
If your printouts become grainy or blurry, you notice misalignment of vertical lines, or you see dark or light horizontal bands, you may need to align the print head.
Banding may also occur if your print head nozzles need cleaning.
Windows: Right-click the  printer icon in the bottom right corner of your screen (the taskbar) and select Print Head Alignment.
Macintosh: Open the Applications folder, then the Epson Software folder, and then open Epson Printer Utility 4. Select Print Head Alignment.
Click Next, then Print to print the first alignment sheet.
Do not press the printer’s  stop button to cancel printing while you are printing a test pattern with the Print Head Alignment utility.
Check the printed pattern and follow the instructions on the screen to choose the number representing the best printed pattern for each set. Then click Next.
If no patterns are aligned in one or more of the sets, choose the closest one in each set and click Realignment. Then print another alignment sheet and check it.
Click Skip (where available) if you want to skip a particular alignment sheet.