Select System Preferences from the Apple menu > Printers & Scanners (or Print & Scan, Print & Fax) and then select the printer.
Click Options & Supplies > Utility > Open Printer Utility.
Click Power Ink Flushing.
Follow the on-screen instructions.
If print quality has not improved after running Power Ink Flushing wait for at least 12 hours without printing, and then run the nozzle check again. We recommend turning off the printer. If it has still not improved, contact Epson support.