I turned my 3880 on today and the LCD said NO INK CARTRIDGE - INSTALL INK CARTRIDGE with all 9 ink positions flashing. In the past I fixed this by putting a piece of cardboard under the MK cart. Now nothing works. I put cardboards under all the carts, jiggled them, etc. So I decided to find out if it was a problem with the printer or the carts/chips. I removed the MK and PK Cone carts and replaced them with the original Epson carts by removing the Epson chips from the Cone carts and putting them back into the Epson carts. Now everything is fine. It seems that both Cone PK and MK carts and/or reset chips have a problem. The reset chips have either gone bad, or they aren't making proper contact with the Epson chips below them. The problem is only with the Cone MK and PK carts. All the others are OK. I installed and reinstalled the Cone chips/carts for MK and PK several times, pressed down on the reset chips to make better contact with the Epson chips below. Nothing works. But installing the Epson chips back into their original carts and installing those carts always works. Any other suggestions? I may have to buy new PK and MK reset chips to see if that works (or maybe both the chips and the carts – maybe the reset chips haven't gone bad but are just not making proper contact because of the cart?)
P.S. After reading another post about this issue, as suggested in the post, I applied several layers of gaffers tape to the indent hole just behind the reset chip to make the cart have better contact. It didn't work.
P.P.S. From URLSWO's post: "I could not get the Magenta cart to seat/be recognized after using several variations of tape. What I did was take the Magenta cart’s two chips and installed them in the Matte Black cart I had not filled and it was recognized with no additional adjustments." This implies that there was a problem with the Magenta cart itself. Putting both chips into another cart solved the problem.