Question about Cobra 29 LTD CB Radio

2 Answers

Wired backwards a friend accidently connected pos to neg and neg to pos. The radio smoked a little. Is the radio worth fixing or should I just replace it. Stock radio, no upgades.

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  • bexxdad Jan 28, 2008

    thank you for your help, the trip to the cb shop will be the attack route. If they say a stupid price, I'll repost to get walked through the soldering. Thank you again.

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In many CB's there is an internal diode that is connected across the DC line. When the power is connected correctly, the diode is reversed biased and does not conduct. When the power is swapped, the diode is forward biased and conducts. When that happens, it causes the in-line fuse to blow. Was there an inline fuse in the power leads? I would take the cover off and see if there is a burned diode where the power cord enters the radio. Take a look and see what's burned. Let me know what you find and we'll go from there. If there has been a lot of damage, it may not be worth fixing.

Good Luck,
- Jim

Posted on Jan 28, 2008

  • SHARCNET-USA
    SHARCNET-USA Jan 28, 2008

    Good luck with the repair shop. We'll be glad to help you further if they quote you a high repair bill and you want to try fixing it yourself.



    - Jim

  • SHARCNET-USA
    SHARCNET-USA Jan 28, 2008

    One more comment. When you get the radio working, make sure there is an in-line fuse in the power leads. It's easier to replace an external blown fuse rather than an internal burned up diode. Good luck! - Jim

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Yes Yes Yes. Before anyone tells you different, Yes. The smoke is supposed to happen when you do that. That is a protection diode that fried. It is there for that reason only. In rare cases, more damage can be done, but about 98% of the time it just fries that diode.

You can take it to any cb shop and have it repaired, just tell them the protection diode was fried. They should only charge between $10 and $15 for it. I charge my customers $10.

If you do not have access to a cb shop and are handy with a soldering iron and desoldering iron, I can walk you through this repair. Just let me know. You can post here or email me at rollincbmods@yahoo.com

Dean
Rollin CBs

Posted on Jan 28, 2008

  • Dean Pitts
    Dean Pitts Jan 28, 2008

    by the way, the protection diode # is D23

  • Dean Pitts
    Dean Pitts Jan 28, 2008

    That is what we are here for. If they try to tell you more than $15, you can call me if u like 903-466-1750. I have no problem straightening them out, lol. That is my cell phone and business phone.



    Dean

    Rollin CBs

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I bought a 500/1 jl audio amp and also a w7 10 sub


if its cutting off and right back on then check your ground and your power wire makes sure both are connected good and none of your fuse's are blown, either that or you got a wire hooked up backwards in the sub.. but my guess is that the sub is hooked up wrong... that sub should be hooked up in a series or in parallel,

ok if your running just one speaker, it should be hooked up like this and 2 speakers are a different way...

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