Time Capsule showing monitor icon in Finder sidebar
Also I have this problem in OS 10.10 Yosemite and it's continues to give me the inconvenience, so I googled till I find the answer. Finally, I'm trying to do this: make sure that the TC is not mounted (or dismount it). Then 
in finder menu use Go -&gt; Connect to Server. Type AFP://TCnetworkname or IPaddress (replace with the real IP or real network name). When the computer finds the TC, you need to give a password (public for default) type in your password if you changed it or public if not, then save it in your keychain. That's it.