Epson stylus pro 4800 service req 0001001e - Epson Stylus Pro 4800 InkJet Printer

SOURCE: epson stylus pro 4800 print head problem

Are you getting a nozzle check at least?

SOURCE: Epson Stylus pro 4800 field repair manual

Epson is pretty cautious with their proprietary materials.

SOURCE: epson 4800 pro

Make sure that the "Encoder Strip" is clean and in the channel for the sensor located on the back side of the printhead carriage.

SOURCE: Turn the printer on and I get this message:

try this turn off the printer

then...

hold the power button and the pause button together, it enters factory rest mode

SOURCE: how do i reset the ink cartridges in my epson

You can get a chip resetter from any of the places that sell refillable cartridges as I did. Works great. They generally sell for about 10 bucks or come with a complete set of the refillable cartridges. This device will also reset the chip on the waste tank so you won't need to go through the button pushing sequence found in the field service guide - that's the one that Epson doesn't want you to know about or have.