Tom you did not read what I wrote, I said reported. This indicates it
may not be out of ink.
Many of these companies have admitted, they put a timer type of chip on the
cartridges to count number of copies made, and default it to report empty at
the number of copies made. (not empty carridge) This is bad business.
On Epson's you are totally correct. They use a pump and pump the ink to the print head which is separate from the cartridge.
Several inkjet cartridge refill kits show you how to deactivate the chip
on the cartridge. Can't remember which company off-hand. I'm sure I
could find it again if I had time to do a search.
Betty
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