GNU/Linux Manjaro Epson ET-4800 Printer Setup – Step by step Guide
How to Install Epson ET-4800 Series Printer/Scanner on Manjaro GNU/Linux desktop – Step by step Tutorial.
And to Install Epson ET-4800 Printer on Manjaro you need to Setup the Proprietary Driver.
Especially relevant: after the Driver Installation to achieve the Printer Setup follow guidance to Add Printer!
Finally, the guide includes also detailed instructions on How to Get Started Epson Scanning.

GNU/Linux Manjaro Epson ET-4800 Printer Installation Guide