Question about Cobra 29 LTD CB Radio

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Cobra 29 NW ST No Sound, litesup, keys up, needle swings

Used a batery charger for power, herd a pop sound. still turns and but no sound at all. will key up but cant be herd a another radio.

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  • edcadfab Jan 13, 2009

    thank you, i can be sure that it was not wired backwards. I do know that i hooked it up to the 40 amp leg of the charger by accident , not the 8 amp. i will check again all capacitors, and D23. i don't know exactly what 1N4004 is. I honestly don't know how to check the audio ic. I do have limited equipment. i am not too familiar with integrated circuits.

  • edcadfab Jan 16, 2009

    sounds like it was the audio ic, thank you. im waiting on a new one now. i wonder if you could find one in a old tv or car radio? otherwise im waiting for the mail.



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It sounds like it may have been hooked up backwards when hooked up to the battery charger. If so it probably blew the polarity diode (D23) (1N4004) and with no sound it probably blew the audio IC (TA7222AP) mounted to the case of the radio. Also look at all of the large capacitors and make sure that the tops are not swollen or busted open if so they need replaced also.

Posted on Jan 07, 2009

  • Jay500 Jan 13, 2009

    The 1n4004 a type of diode. On the audio ic, if you hook the radio up like normal, run your finger across the pins of the audio ic on the printed circuit side. If it is good it will make loud noises. If it is bad it will not do anything. If it dosen't make noise it still could be bad capacitors but i would replace the IC first if hte capacitors are not swollen.

  • Jay500 Jan 16, 2009

    Really the only thing the TA72222AP is used for is CB radios.



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