The contact black can be damaged if ink or moisture is on the contacts, resulting in a bad cartridge read out or error message. This can also affect the ink replacement consumption calculation within the printer.
Each cartridge reader assembly will have a contact block chip. Newer model printers will have a quick release option while older machines will require to replace the entire assembly.
(1) The chip will have two small tabs; one on each side. Use a set of small tweezers to push on the tabs and slide the chip out.
Replace with your new chip and insert cartridge once powered up to verify that its working.