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Re: diode or not
The first thing to check is the inline fuse. If it is blown and a new one does the same, you may have a shorted reverse polarity diode across the power input. If you need further information on how to check and replace it let me know.
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plug the external speaker into your PA jack and select the PA switch. If PA works then the audio chip is good. The cobra 29 must have a mic plugged in to get receive audio, You may have a broken wire at the mic connector.
d23 a 1n4004 diode second component from pa speaker port inside radio has failed. It is most likely that neg/pos polarity has been switched shorting this diode. It is there to protect your radio from reverse polarity as so it is names the "protection diode." 2 solutions first not recommended.
1. Cut the diode this will stop the directed grounding that is continuing to blow your fuse. 2. Go get a pack of 1n4004 and rosin core silver solder from radio shack and replace it paying attention to the direction it is installed.
just a side note the solder trace often burns in this area so a jumper wire soldered in around this bad area solder side maybe needed.
Hi, my name is John. Either that or you have a bad capacitor in the volume. Try going with the external first. Then go from there.May be other issue...Let me know. I will post it here...hope this was helpful rating..
Do you have any noise at all coming thur? If not do you have an external speaker try it still nothing then take your speaker plug and plug it into your pa jack key the mic do you hear anything if not its your IC chip,its bad it'll need to be replaced,if you do it could be a bad soilder on the board or a broken wire in the mic.
This may be a dumb question, but have you tried replacing the fuse in the power wire? That fuse blowing might have been the pop you heard. It is possible that you did short something out, though I have never had that happen by messing with the wires for the PA.
If replacing the fuse does not help, and you know that there is still good power and ground coming out of the power plug, you may want to try replacing the protection diode.
That is where I would begin, the fuse, power and ground coming into the radio, and then the protection diode. If nothing helps, please let me know.