I have a strange one on my hands. the PLL is unlocked due to a low signal to the PLL chip from pin 6 of the TA7310 IC. I have tried multiple 7310’s with the same result. I have replaced every component in the pin 6 circuit, no luck. Even swapped PLL/mixer chips with a known working 29 and no go. the ones pulled from the failed radio work fine in another 29. I can think of nothing else to check/try. As for clues beyond the low signal, the DC voltage seems to be high at about 6.3 volts (varies…

Read more