A Sound Mind
Reckless Tinkerer
Hi All,
I get no FM output either in mono or stereo mode. I tracked the signal on the tuner board to the BA1310 multiplexer IC. Pins 4 and 5 should have an output signal, but do not. I tested all the transistors and diodes in this area and they're fine. I don't fully understand the FM multiplexing circuit and don't want to replace this $10 IC if it isn't necessary. Also, the stereo indicator doesn't light. AM/phono/aux all work fine. Does anyone know of a common cause of FM failure with this model? Can someone help me to zero in on the source?
I get no FM output either in mono or stereo mode. I tracked the signal on the tuner board to the BA1310 multiplexer IC. Pins 4 and 5 should have an output signal, but do not. I tested all the transistors and diodes in this area and they're fine. I don't fully understand the FM multiplexing circuit and don't want to replace this $10 IC if it isn't necessary. Also, the stereo indicator doesn't light. AM/phono/aux all work fine. Does anyone know of a common cause of FM failure with this model? Can someone help me to zero in on the source?