My epson stylus nx420 printer does not recognize the new black ink cartridge

SOURCE: epson stylus photo rx580

Hi-

You are having a hardware problem with the printer, the sensor is damaged. call epson @ 5622761300 for replacement ink and printer.

Hope this helps

SOURCE: Epson Stylus NX400 printer doesn't recognize

try to unplug it and plug it back in

SOURCE: epson stylus cx8400 cannot recognize ink cartridges

I had the same problem except it would not recognize any of the ink cartridges. I kept hitting the OK button over and over again with the same cartridges in place not removing them at all and it finally recognized them. Decided to go to maintenance on the printer to do a test, and it went right back to not recognizing the cartridges. So i pressed the OK button over and over again until it finally recognized all the cartridges again, but this time i did not try and go into the maintenance to do a test run. Plugged it up to the computer and it has been working ever since. So press the OK button until it recognizes the cartridges, and run no tests on it is what my solution was for the problem. Really is a pain but it works now.

SOURCE: "Ink cartridges cannot be recognized" when using genuine Epson

i had this happen to me twice with two different people, it is highly possible that your black inks are defective, its also highly possible that one of the other inks are causing this error. take them all out, and put one and see what happens, do this one at a time until you see something screwey.

also possible, the contacts on the printhead are dirty or are pushed in.

also possible, bad printhead.

SOURCE: Epson Stylus SX400 "Ink cartridges cannot be recognized"

Try this: First check which cartridge(s) are not being recognized. In my case where I replaced all three color cartridges, two were recognized right away but one was not. You find out by sending a print request to the printer and looking at the ink cartridge levels diagram in the dialog window. In my case two of three were fine but one had a red X on it. So I removed it and cleaned the contacts with alcohol then rocked it in the slot after pressing it in. It was recognized and the charging process began as normal.