Epson 9890 Print Head dead twice? What to do?
There is a VERY long discussion on the 7900/9900 Epson printers on the Luminous Landscape forum.
One of his big finds was that the head wiper can break down rather easily. If you replaced the head without changing the head wiper, you may have continuing problems from this. He actually shows you how to change the wiper in a video.