If you are having difficulties with the Epson Stylus NX420, try referring to the Troubleshooting Page.
Background and Identification
Epson's Stylus NX420 All-in-One printer released in 2010 includes three major functions of printing, scanning, and copying. The NX420 boasts an ISO print speed of 6.4 ISO ppm for black ink and a 3.3 ISO ppm for color ink. The printer allows for mobile printing and a wireless network.
Documents can be scanned and archived onto the printer to be saved as JPEGs or PDFs. Documents can be reduced or enlarged in size on the 2.5" LCD screen, without needing to turn on your computer. Lastly, colors can be replaced as needed with the four different ink cartridges available in different capacities.
More and similar information on the device can be found at the Epson website, here.