I had this radio given to me, it does not turn on. i took my test light and check the internals of the radio and got power inside the radio. i then went on the the next step and replaced d 23 so im lost and would like some guidance. help please thank you jon
These repairs can be a little tricky to fix with out seeing the radio and the right equipment. Try replacing also D8 and or C123in between both diodes but first make sure on the other side of the trace side there are no burned out traces and they all look good. These traces can have a very small crack that you cant see with the naked eye so use a good magnified glass. Also is is there any lights on at all on the radio when you plug it in?? Because some times TR23 will go out and the radio wont come on but there will still be a meter light or green RX light!! Hope this helps a little let us know if you have other questions!!
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Hi, Great radio when it works. If you have your settings on CB - not PA - -be sure that your Cobra has that setting selected. If CB -is selected and still nothing - be sure you have a working mic. These wires are fragile and can break internally. One easy way to check is to borrow a cobra mic or even drop by a CB repair shop and ask them to do a mic check with the mic - it is free.
If you have a bad mic replace it and all should be well. If your mic is good and it still doesn't transmit you will need to replace the finals in the unit. It is common that these burn out of you got too close to someone with too powerful a radio. The CB shop will need to look at it further and repairs should not be over about 40.00.
As I understand from a tech friend of mine, most truck beds are not grounded well enough. Perhaps you could borrow/purchase a magnet mount antenna and locate it on the roof, for testing. Then you would have it narrowed down to the location.
Had fixed the same problem yesterday. My cobra worked when it wanted to, when it didn't it looked like you explained. I found out that on my cobra the blue wire on the mike connector was broken. When it disconnects, no sound. after soldering, everything works fine.