/diy/ - Do It Yourself

>>1117816
Well shit, having resurrected a few devices by reseating key chips, I just pulled and replaced the uC from it's socket. We now have full panel function, but still no audio on local commercial AM frequencies. Signal meter doesn't appear to be doing anything either.

Based on pic related, I should be nosing around in, and upstream of, the AGC sections, right? This is where the signal meter is fed, and presumably, if the AGC section was faulty/dead, the squelch block would be stuck in "mute" mode, thereby preventing the mode switch from passing signal from whichever RF section/band is currently selected, to the AF chain.. r-right?

I'ma need to look up how all these blocks works so I know what signals I should be looking for, but I am so far out of my depth here it hurts. I know next to nothing about RF stages of devices, not much more about analogue beyond class B amps and light/motor controllers. I'd prefer the fault was in the digital sections to be honest, TTL I can work with.