Still having this problem...got a reply from Jon Cone saying Hi Rick,
You may need to apply for technical support for your problem.
Your printer requires wasting a lot of ink in all of the positions in order to switch ink modes.
It has detected a chip (not a cartridge) that is reading low in one position or more.
You would be able to see which one by using the Epson Status Monitor or looking on your LCD panel.
The chip is not connected to the actual ink supply by wires or any other mechanism.
So you should not look at the ink remaining in the cartridge as that is irrelevant to how Epson keeps track of remaining ink.
Chips are only reset to 100% and the printer counts what percentage of the full cartridge has been printed and what is remaining by its calculation algorithm. It would do this regardless of whether there was ink actually in the cartridge or not. It only responds to the chip.
So the amount of ink in the cart is not the problem - the % remaining in the chip is.
And your low ink may not be in the black position - which is why I want you to determine which cart or carts are low by using the Epson Status Monitor or LCD Panel.
You can replace one cartridge - but I hope that you fully understand your problem.
You can purchase individual cartridges here: http://shop.inkjetmall.com/Refillable-Cartridges/
If you need technical support instructions for that are here: http://shop.inkjetmall.com/About/Free-Technical-Support/
Your customer ID is C20468
So I went on inkjetmall to replace one cart [ photo black ] but can't see how to do that. I think when I went to replace the cartridge, I forgot to pull the black plastic pin, so probably corrupted the cart. any input would be appreciated, thanks, Rick stockwell