08-01-2022, 07:54 PM
Thanks, haven't thought of that. On AM band I just watched the 470 ohm, 2 watt resistor fade color then the casing began to melt. Not sure about the FM, but I can scratch out any FM circuitry that is isolated by the band selector and reduce the circuitry to look at.
I'm starting to get a feeling about the IF transformers. My trouble started when I damaged Z1 and got a replacement from another radio. Finding the radio dead I replaced Z2 so I had a pair from the loaner 51-934. Their terminals have green and pink dots that don't always agree with the schematic, even one that I never removed. I get good ohm readings so the transformers are probably good, but there may be a wiring problem there. I get a headache if I stare at these too long.
Alan
I'm starting to get a feeling about the IF transformers. My trouble started when I damaged Z1 and got a replacement from another radio. Finding the radio dead I replaced Z2 so I had a pair from the loaner 51-934. Their terminals have green and pink dots that don't always agree with the schematic, even one that I never removed. I get good ohm readings so the transformers are probably good, but there may be a wiring problem there. I get a headache if I stare at these too long.
Alan
