Hello all, I have a Teac AG500 that will not switch between inputs. The CD and Phono indicator lights are both lit. When you try to select tuner the indicator lights momentarily then goes out(leaving CD and Phono lit). It does play audio through the CD input. I have checked all resistors and tact switches on the front panel board all are good. I am leaning towards the IC on the mainboard that switches the inputs but do not have a print and am not sure which IC it is! Any and all help is greatly appreciated.