Question about Cobra 29 LTD CB Radio

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Blown finals - Cobra 29 LTD CB Radio

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Hi, my name John. I don't know what finals your are asking about, do you you need to replace them, are you going to do the work your self ? There are several .RF, RX, AUDIO, PRE-DRIVER, I will help you, just narrow it down to what you need to replace. I will post the tools and what you need to do the job........hope this was helpful..Rate this solution on the four thumbs-up....I will post it here.... .John

Posted on Sep 11, 2010

  • Martin Manley
    Martin Manley Jun 13, 2014

    cobra 29 lx blown finals, will do work myself but need more info like part associated with finals and any info about repair. never repaired cb, only computers. thnx

  • Martin Manley
    Martin Manley Jun 13, 2014

    my radio is a cobra 29 lx not 29 ltd

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So as long as you tested it with another radio, and it is not transmitting it could be any number of things. If you have never had antenna tuned so the swr is low, or your swr was high for a long time, your final transistor is most likely blown.

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I tried to answer this the first time you posted :). If the finals got burned that bad I found that the bias resistor sometimes will get a burned foil and not make good connection. Also 1/10 watt sounds like the driver isn't amplifying from the buffer. Might want to check for burns on the foil all around the final stages, including where the antenna connector mounts to the board. Don't believe the caps are blown but as a last resort.... Its really hard to troubleshoot without the radio on the bench . Good luck.
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Hi and welcome to FixYa,

Initially, pls confirm that there is modulation (transmit audio). The reason I asked is if IC4 (TA7222P) is blown, then the radio would have no audio amplifier which would explain no receive audio. Additionally, the final and pre-final (TR15 & 15) gets is modulated TX+12 through D8 from T1 which in turn is the output of IC4 through C48.

Perhaps a schematic diagram may be of further help.

Good luck and Thank you for using FixYa. Happy Holidays.

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