Question about Radio Communications
In this case, I believe the power output transistor is shorted, The .1W output shows the exciter transistor may be OK. Locate and remove the power output transistor, find it's replacement thru an NTE catalog, and order it (maybe you want to order two, in case you mess the first one up). Resolder the replacement transistor the exact way you saw the original soldered, as sometimes they use the solder itself to transfer the heat generated by the power output transistor to the heat sink ( or what there is of one if your radio is a handy-talky). Use an ESD wristband, and ground it to the metal case, or the circuit board's ground plane. This will eliminate you destroying any static sensitive devices on the circuit board, causing worse damage than when you started the repair. Good Luck,
Posted on Jul 24, 2009
Good answer but it could be a broken wire in the mic.
Posted on Jun 28, 2015
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Posted on Jan 02, 2017
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