Date April 2nd 2011 I am posting this
I bought a new 9890 printer a month ago, I replaced my first Light light black 150ml (T6429) 9900 and 9890 uses same inks within their color range (same part numbers) but I got the ink cartridge error, I had also replaced vivid magenta, LLM, LK and they were fine, I am new using a large format printer so I went through this forum I even registered today and I followed all the advice and tips. I tapped the cartridge gently, rubbed the chip etc.. reinsert the cartridge many times, nothing!! Gives cartridge error. I have to wait till monday to call epson, lost weekend sales, I'd appreciate more feedback about this issue