Hi,my harmon kardon av20 ii has been sitting for 10 plus years with no use, i put it back in line and the am -fm just scans, it won't lock on to any radio station in am or fm mode,i've tried several differnt style antennas and it took it to work and tried it there with no luck,the rest of the reciever works fine,anyone have any suggestions ,thank you in advance. Ziggy