Looking at the schematic from the [https://elektrotanya.com/sony_wm-fx303.pdf/download.html|service manual] it seems that the FM -AM- Tape (radio off) switch directs the audio to the amp when operated to the desired input, so you may need a multimeter to check if it is working properly.
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Looking at the schematic from the [link|https://elektrotanya.com/sony_wm-fx303.pdf/download.html|service manual] it seems that the FM -AM- Tape (radio off) switch cuts off the tuner (AM FM) section, so you may need a multimeter to check if it is working properly.
If it is faulty I can't find a replacement by searching online for the part # (Sony 1-692-299-11), you may have better luck
Hi @isaahvillanueva
Looking at the schematic from the [https://elektrotanya.com/sony_wm-fx303.pdf/download.html|service manual] it seems that the FM -AM- Tape (radio off) switch directs the audio to the amp when operated to the desired input, so you may need a multimeter to check if it is working properly.
If it is faulty I can't find a replacement by searching online for the part # (Sony 1-692-299-11), you may have better luck