broke my kenwood 120s radio no rx now

[nfsus]

heres what happened. i had the kenwood all hooked up and it was working fine. i was jacking around with my power supply setup and believe i sent a 120v spike to the dc side of the multitap bus i use. it didnt damage anything else on the power supply however the kenwood has lost most of its receive capability. vol all the way up and rf gain all the way up i can barely hear a station. so i spiked the front end. tx still works like it should.

so where would i begin to look on this rig? its in the front end i figure but where

 

[buickid]

What is your power supply setup and what did you do to get 120V on the DC side? Something sounds messed up if that's possible without purposely doing that.

 

[nomadradio]

i spiked the front end

If so, the S-meter will not show much if any movement. And if the S-meter is still showing channel chatter, you have an audio problem not a RF problem. Since the DC power input branches off to the speaker-amp chip before the voltage gets dropped down for sensitive receiver circuits, the audio amp would be my first suspect for surge damage.

Unless the S-meter is not moving. If that's true the next suspect would be the 8-Volt regulator that feeds the receiver's sensitive circuits.

73

 

[357]

are all bands deaf?

 

[nfsus]

Yeah.

 

[nomadradio]

About that S-meter. Really does provide a dividing line to begin troubleshooting.

73

 

[brandon7861]

While we wait for the S-meter report, I would just like to add that the schematic for the TS-130s is a slightly better quality scan. Other than power output and a few minor features, they are nearly identical radios.

The power regulation is done on the AF board too, but I would also like the answer to nomads question and see what he thinks before I throw ideas out there. I have a 130s, but I have spent very little time inside it.

I do have a parts 130s in pieces as well, so chances are, if you find the culprit, I may have parts. It all worked besides the band switch when it was gutted.

Edit: The PLL board is gone though, sold that to a guy in Alaska.