My Harman P38, circa 2002 quietly shut down, didn't notice it until we smelt smoke. Replaced a blown 3A fuse, to no avail. Unit has power to the two rotary switchs, with no fuse in the holder. When a new fuse is installed, there is no power to either side of the fuse holder, but to one side, without a fuse installed. Can any one shed any light ? Thanks park4019