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Re: cb microphone don't work correctly
IF YOUR COMFORTABLE WITH TAKING THINGS APART & CAN USE A SOLDERING IRON.ITS JUST A MATTER OF REVERSING THE LEADS GOING TO YOUR MIKE KEY.OTHERWISE I WOULD SUGGEST TAKING IT BACK & GETTING ONE THAT IS COMPATABLE WITH YOUR RADIO.
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Check the squelch level, either the knob or on the menu. When the squelch is 'open', there will be constant noise. If someone is transmitting nearby, do you hear them clearly? If not there may be a problem with the receiver in the radio.
Sounds like the radio was subjected to electrostatic discharge. If you have your manual, and it describes a way to do a "master reset" on the radio, follow the instructions. This usually involves pushing down on one key while turning the radio on. Otherwise you have to find a licensed dealer for factory service, as there is no way to repair the radio yourself. The use of surface mount technology still confuses many Techs unless they have been to a company's two or three week seminars.
G'day, I think your problem with the Cobra cb is in the microphone, you should have a plug on the Mic cord end ,try disconnecting this from the CB unit and see if it clears it self. If this does the trick your problem is in the Mic it self, or the cord has a fault in it. However if you still have a problem it may be that the transmitt/ receive relay located in the Cb is stuck on transmitt, sometimes this can be cleared by tapping the case with the handle of a screw driver, place towel on the case first to stop any damage to the case( this doe's not always work) you may in this case need to have it serviced all the best hope I have been of help, John
I don't know this radio individually, but heres the common thing that happens:
Sounds to me like the 8 volt regulator chip has blown after overvoltage. I expect the power supply has gone too, putting 18+ volts into the radio.
Repair the power supply. (Check its 13-13.8 Volts).
Then check the regulator (7808) is putting out anything, should be middle pin ground then 13V one side and 8V the other, if nothing, its blown. Replace it if gone.
Hopefully thats all thats gone and it should work again.
I'm not sure about your particular model but many CB radios use the microphone push-to-talk switch to kill the speaker while the radio is transmitting. If you don't have the correct microphone or if the cord has a broken wire it can cause the radio to have no sound. Another possibility is that the speaker is bad. There is probably an external speaker jack on the back of the radio. You could try plugging a different speaker or even an earphone in the jack to see if you get sound there.