crwdns2933897:0crwdne2933897:0

Why doesn't my = key work?

I can add and subtract all day, but my equal key = does nothing except easily press down and pop back up. The machine worked last week, so I'm stymied.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0