If that is where you come to see us, I'm glad you did.
We think of the forum as not just a place to discuss radio - but also have a basic set of rules that are not posted but presumed that any good tech would know to do first before arriving to a conclusion that the problem becomes larger than life and need help with others to bear their knowledge onto the playing field.
Obviously, I'm guilty. If not just producing long winded "got cover the bases" approach onto check here and there - and everywhere - may work for storytelling and learning a moral or two - but don't help the person if they don't know what to look for or how to start.
I guess we just figure the person did the right things and replaced fuses and even did continuity checks and replace or at least checked the microphone handset wiring and made sure 1 - is ground, 2 - is audio, 3 - is TX and 4 - is RX.
But why?
Ok, A cobra 29 uses Pin 3 as a means to switch on or off the TX side, so to do that - they use a PNP 2SA733 and once it's grounded - turns on a line that sends power to here, but WAIT there is another line that goes to Pin 4 that when grounded does something else - it completes the speakers circuit - Oh, so that is why you don't hear anything when the mic is not hooked up - Pin 1 and Pin 4 short to each other - oh ok...
So, yeah, I can easily see where - ok, where do I start - it's a lot harder than it looks.
So, I'm not here to dictate terms or start an argument but if you come with the basics of electronic theory and practice and have successfully jump started a car or two in your lifetime - you are pretty much qualified - with that approach, the tables become turned back to the poster and we may ask a lot of silly questions about; Did you do this? Ok, did you do that? Ok, how about this - what did you get here?
It can get frustrating...
So, in a way, you're using/developing a flow chart to determine the course of action based upon more and more specific questions to find the root or at least an answer.
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The chart goes on and on - but eventually you arrive to a solution using / developing a path - a course of action to take - that is unique to every scenario - for not all radios have blown fuses, some have BLOWN TRACES and parts damage - so this chart can get very complex very quickly because you are trying to account for every scenario of "No Power"
So, in a way - you can catch us "off guard" when we have very little information to go on - we can only speculate - but we can guide you faster knowing that if you did this and this before you posted here, the results would whittle down the branches of the trees this radio could take us on - to just a few limbs.
