Did u buy it used or new? Any warranty on it? Because it seems that you just have to much down time while you can be making money
3rd party or OEM inks?
I reckon the chip reader pins have got bent.
I have replaced these twice in my 1604 and in my opinion a poorly designed part.
When installing a new cartridge if the cartridge doesn't queit insert squarely it can bend the pins.
Also the flexible plate that holds the card readers onto the card face can lose tension and need bent back so it touches the card.
I have replaced the cartridges now with a bulk ink system which elimnates the cartridges ever needing to be removed.
SC
I still would say bent pins on the chip reader. Bulk inks have a chip that is wired in that can be raised a little more than the standard cards and this can cause problems. Pull the cartridges out and shine a torch in and closely look at the pins if any of them are slightly different there is your problem. SCI tried running the bulk ink system but I get am s/c read error so I had to switch back to oem inks. For some reason i get the same error with all bulk inks. What set do you have?