Can I make a remote for Craftsman 139.53606 work with a Overhead Door opener R80CZ with reciever M# 702 code 400-19?
This is really old stuff you are working with. Trying to get things from different manufacturers to work together is almost always impossible. Newer stuff possible - older stuff not. You could get a universal remote and receiver to hook up to that opener but I don't think the opener itself is worth the money.