Are you on the right band, like are you on the main listening but the radio is set for the sub receiver? If that's not it, do you have visual help to see if the display read out is right? -----Original Message----- From: Richard B. McDonald Sent: Saturday, January 02, 2016 9:28 AM To: [log in to unmask] Subject: Function Key for Signal Level No Longer Working on TS-2000 Hi! For reasons unknown to me, when I now press the function key (far upper left button), my Kenwood TS-2000 now always says "S Zero." This is no matter how strong the signal in fact is. What might cause this? 73, Richard KK6MRH/AG