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790-H No Xmit Audio

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swen_out_west

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So I am looking at a 790-H for one of my friends and it transmits a carrier (RF Power Out is fine) but no audio. Friend said that before he was looking at it had weak TX audio albeit you had to be close, but now nothing.

I have swapped Mics, Heads and Cable with the same results. I have basically narrowed it down to being inside the deck.

Before I start signal tracing is there something I am missing? I appreciate any and all help.
 

swen_out_west

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Actually, it still has very faint xmit audio. At a close range with the receiving radio you can faintly hear the audio if you turn the receiving radio volume all the way up. I also just learned that someone hooked up the mic wrong and keyed up or something like that. Basically all the information I got was that someone shorted the line.

Which leads me to the belief that something fried in the Microphone amplifier section (X57 B/3). He wants to fix it to the component level (God I hate MicroMinature soldering, LOL) but I really think the best solution is buying a replacement off Ebay for $100.
 

swen_out_west

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Pretty confident that it's one of the summing amps (IC 510/513) in that circuit since the signal is still getting through. both of which are OP AMPS NJM4558M which are readily available from EBay for .40 cents each.
 
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