Courier PLL 40D, recapped. Turn it on, emits buzzing noise and blows fuse. Go through this cycle a few times in different modes to try find one that doesn't do that, stumble across PA where fuse doesn't blow. OK, that should help me isolate it a bit. It doesn't, but it should. Pull the "RL2" relay to see if that's it, set it to CB, fuse still blows.
In PA mode I've checked the voltages that should be present regardless of mode, they look OK. Also checked the receive voltage test points for shorts, found nothing.
So, I'm scratching my head wondering what I missed. There's no obvious dead shorts to ground, and I've checked the solder work on the board already. It's not NASA quality, but it's not glob jobs and solder bridges either.
I've thought about smoke testing the rig, but I don't have a 20 amp fuse handy and I'd rather not fry the regulator transistor, as it seems to be happily doing it's job for now.
So, throwing open the floodgates, any suggestions that don't involve selling the radio on eBay for parts? Not that I haven't considered it.
In PA mode I've checked the voltages that should be present regardless of mode, they look OK. Also checked the receive voltage test points for shorts, found nothing.
So, I'm scratching my head wondering what I missed. There's no obvious dead shorts to ground, and I've checked the solder work on the board already. It's not NASA quality, but it's not glob jobs and solder bridges either.
I've thought about smoke testing the rig, but I don't have a 20 amp fuse handy and I'd rather not fry the regulator transistor, as it seems to be happily doing it's job for now.
So, throwing open the floodgates, any suggestions that don't involve selling the radio on eBay for parts? Not that I haven't considered it.
