You can
check the print head nozzles and clean the print head using the
control panel on your product.
If you still
see gaps in the nozzle check pattern after running the nozzle check
and Cleaning three times or a Power Cleaning once, turn the product
off and wait for at least 12 hours. Then run the nozzle check again
and repeat the Cleaning if necessary. If print quality does not
improve, run a Power Ink Flushing. If print quality still does not
improve, contact Epson support.