My Kenwood VR 60RS A/V tuner has been disconnected for 3 years and required reprogramming when connected again. I reset the microprocessor & setup the tuner following instructions. I’ve connected a CD player and tried the internal radio/tuner but no sound at all. Not even test tones. Speakers are ON, mute is OFF & speakers are connected properly. It displays properly but no sound at all. Can anyone tell me why I’m not getting sound or what I’ve done incorrectly. Thanks in advance!