Load A4 -size plain paper in the printer.
Select Maintenance on the home screen.
Select Power Cleaning.
When cleaning is finished, print the nozzle check pattern again. Check that all of the lines in the nozzle check pattern are printed correctly.
If print quality has not improved after running Power Cleaning, wait for at least 6 hours without printing, and then print the nozzle check pattern again. Run Cleaning or Power Cleaning again depending on the printed pattern. If quality still does not improve, contact Epson support.