Uniden PC76 resurection

[roadrage]

I call it a resurection, it is an attempt. The radio was intermittently having spells where audio wasn't being applied to the carrier. It would come back and go randomly. Eventually it just never came back. I was told on another forum to test the modulation amp circuit. I asked how and never heard back. I don't know much about radio components. This is my foot in the door for repair.
I also used my multimeter to check the mic jack and had varying continuity between any/all pins. When the radio is on and I hit the PTT the TX light illuminates and when I release it, it goes back to the green light.

 

[towerdog]

try another mic, can be cobra, uniden or galaxy, and most aftermarket mics use the same pinout.

 

[9C1Driver]

At this point check all the simple stuff, mic, radio settings, power cord, antenna and such. Once thats done send it in.

 

[roadrage]

My bad, I should have given more info on what I have eliminated. I tried a different mic, hooked it up in another truck and in the house, and it didn't make a difference.
I really want to at least try to fix the radio myself before I send it out. I am interested in getting into being able to work on my radios. I have a pile of junk radios that I have started to practice my soldering skills and component replacement. The Uniden may or may not be over my head as far as being able to fix it, but I don't want to give up before I even try. I am going for my ham ticket sometime and figure that what I learn will help me on my way by understanding how the radio works. I am the type of person who needs to know why and how. Knowing an answer doesn't make one intelligent, it is knowing what the answer means.