Adjust Print Quality : Clean the Paper Path

Clean the Paper Path
If you see ink on the back of a printout, you can clean the paper path to clean out any excess ink.
Windows: Right-click the  printer icon in the bottom right corner of your screen (the taskbar), select Printer Settings, click the Maintenance tab, and select Paper Guide Cleaning.
Macintosh: Open the Applications folder, open the EPSON Printer Utility 2, select Stylus CX4400, and click OK. Then select Paper Guide Cleaning.