I do not know if this is the or any solution, or if the problem I had is generally the same as that discussed here. I run OS 10.10.5, I bought a new 2Tb time capsule, it did not show up on Finder though it otherwise functioned exactly as it should. I wanted to download the contents of my previous time capsule onto the new one and had nowhere to do that. I read through all the above and attempted some of it with out success. Yesterday, perplexed and disconsolate and four days into the problem, I toyed with the Finder Preferences and clicked on Bonjour Computers (whatever they are) in the sidebar frame. Instantly, Time Machine appeared in the finder sidebar under Shared.