Buy Canon 2950B001 CL-221 Ink Tank (Gray)

I was able to disable the ink monitoring system by holding the stop button on my MP980 for about five seconds. I have done this only for the gray and only to print until I get a new cartridge. It appears by my testing that this system is re enabled by installing a new cartridge or removing and reinstalling the old one. This is explained in the online manual that came with the MP980 although it is buried. TimGet more detail about Canon 2950B001 CL-221 Ink Tank (Gray).