I just inherited a Rowe/AMI RB-8CD juke box. There's no sound until the unit warms up for about 1-hour. The CD player visually appears to be working – it loads the CD, it changes from track to track (if I program it to play multiple songs), and it returns the CD to the rack when it's finished the selection(s). There's just no sound coming from the CD player. I plugged the CD's RCA cables into a boom-box to verify that there's no audio output from the CD player. I also plugged the output of the boom-box into the juke box's amplifer to verify that the amplifier is working. I cleaned the CD lenses with a lens brush. Any ideas?