My 7800 no longer recognizes the yellow cart after trying to use piezo flush with refillable carts bought at inkjetmall.
Here’s what happened: I bought the flushing fluid and refillable carts for a 7800. I got a clean nozzle check with my already-installed Epson inks. Then I installed the refillable carts containing the flushing fluid. The printer didn’t recognize the yellow position; it said I needed to install the yellow cartridge, even though it was already installed.
Now, the printer will no longer recognize any yellow cartridge – including the original Epson one.
I spoke to Wells who asked me to send photos of the contact pins in the yellow position. He has those photos.
Also, on Wells’s suggestion, I looked closely at the chip on the refillable yellow cartridge. It felt rough to the touch on the front edge of the chip. As I was rubbing the chip with my thumb, the chip slipped out of position. I’ve sent him a photo of that chip, too.