I hava a cobra 148gtl from 1992 when i turn it on has no power but i do hear a humm internaly,any help would be appreciated.
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Cobra 148 gtl 1992
- Thread starter kaos513
- Start date
Well, I would hope that when people want to fix their radio - which is all fine and great - that they would start to give some data on what they found so far. You know what I mean; power issues. Did it get reversed voltage and pop the protection diode? If not; then is the regulator getting voltage to the main rail? And so on . . .
I unsoldered the final still get no power to the radio like its dead but i do hear a hum around the chassis when i put my ear on it
I just had it laying around for a long time last time it was fired up was like last year.
Does the radio light up? Channel display is lit? Does the tx/rx light change when keying the mic? What do you mean that the voltage is going crazy? It should be stable at 9v (newer radios) and not changing much at all. Power issues are the first and easiest part of a radio to learn to troubleshoot. After that, it gets a bit more dicey.
That is not a transformer, it is a choke. And no flow thru it means it shouldn't make any sound whatsoever without a load. Did you look at the schematic yet?
Did you check the on/off switch for 13v yet?
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