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This is interesting. Comparing the two radios. When mode is set to AM. TR14 on both radios has voltage (0.7v) on the Collector. When mode is switched to SSB on the 88HL (Reference radio) TR13 has voltage on the Collector. However on the Radio under repair there is no voltage on the...
I was in fact too suspecting TR19 as I had a high voltage on the base. I took it out and tested it and it tested fine. But what I did find was that when I was investigating around D19 and R18 that using my signal tracer that it looked like these where shorting above board, as when I...
While troubleshooting the S-Meter I noticed that I have way to much voltage on T19 Base. Where i should only have 1.7v I have close to 6v.
Andy,
Thanks again for the comprehensive input, this will give me plenty to look at over the weekend. For now I have closed it back up to get some...
Hi Andy, you're a genius. Power feed was the problem. I had a tiny line break between R56 and R58. Receive is working again. I still don't have signal meter though on SSB receive. Thanks so much for sticking with me.
Hi Andy, not exactly though AM/FM receive worked only when C35 was removed. With C35 inserted I get the same on AM/FM/SSB. However with a Heathkit IT-12 earlier today I found a number of spot on the radio where I could hear both AM/SSB, just nothing in the RF AMP area.
update : I don't know...
Hi Andy, I am back. I think I set us on the wrong course when asked to check TP6 previously. I did not measure the signal there correctly. I am measuring 10.7Mhz there.
I am thinking I have an issue in the RF AMP area, as I am not detecting anything on EBC of TR17. I am not detecting any...
If I am right in my thinking the junction of C72 & C74 is getting fed up through C73? If so I have 2.66v on one side of C73 and nothing on the leg towards C72/C74, I presume i should have?
PS I did swap out D27
Thanks guys for the awesome help and support and advice and knowledge sharing. I have checked both D39 and D40, D40 stays high all the time regardless of USB/LSB selected. D39 was low on the anode end. I did replace it out but still low. Is there a transistor that's involved in the switch...
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