Question about Cobra 25 LTD 40-Channels Base CB Radio

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Cb Radio blows the 15 amp fuse in the car when powered up

This is a cobra 25 nw ltd I got it at a yard sale with great aspirations of fixing it myself, then I realized i don't know squat about electronics. When powered it just blows all the fuses.Anyone have any ideas where I could start?

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  • billybb17 Feb 10, 2009

    I changed that diode. It blows the fuse in the red wire and the fuse (15) amp in the fuse box of my vehicle

  • billybb17 Feb 11, 2009

    Helpful but how do I find the cap thats shorted in the final?

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Look where the hook up wire goes into the circuit board. Find the protection diode.Round small black cynlinder with a silver band. cut the diode and run a continuity check across the positive and negative. If all checks out try to fire it up.15 amp fuse is way to high for that radio use 5- 7

Posted on Feb 10, 2009

  • Tom Arsenault
    Tom Arsenault Feb 10, 2009

    Might have a shorted final or cap around the final stages

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1 Answer

No Receive on cobra 25 nw ltd classic cb radio how to fix it


first make sure its on cb not pa. next make sure the squelch is all the to the left. now make sure your volume is open enough not to blast. If you can hear anything you are good if not you need to take it to a tech.

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I just wired my cobra 25 to the battier and it still squeals what do i do


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Dec 28, 2009 | Cobra 25 NW LTD 40-Channels Base CB Radio

1 Answer

Have cobra 29 nw ltd keeps blowing fuses inline and in cigarette lighter adapter adapter is 10 amps and inline is no more than 5 amps


This is an easy fix if you are comfortable soldering.

You must have hooked it up backwards. Big problem when using a cigarette lighter adapter. You have to be careful, if you hook a radio up backwards you blow the polarity protection diode.

  • Go to radio shack and buy an N1004 diode.
  • Open the radio
  • Look towards the back right of the radio for a black diode D23. it will probably look burnt, but not always.
  • Use a soldering wick to remove the solder holding the diode in.
  • Remove it, and replace the diode making sure its going in the same direction as the old on. Strip on the side the triangle is pointing.
  • Solder it in.
  • Test the radio
That should do it.

Make sure you are careful to hook the radio up to power corrctly.

Nov 14, 2009 | Cobra 29 LTD CB Radio

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What Voltage Does The cobra 25 ltd classic use?


12 volts, around 15 amps. For a base station, try an Antron-99 groundplane antenna.

Jul 19, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

How can i connect the volume of my radio


Do you have a Microphone plugged in? No Mike No sound on these.

May 23, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Yard sale find


red should be 12v black should be ground test is on a car battery.

Mar 09, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Fuse


Hi,

There are only a couple of components that could cause the fuse to blow. They are:
1. Reverse protection diode (D23)
2. filter capacitor (C123)
3. Outputs (TR14 & 15)
4. Audio Amp (IC4)
5. Zener Diodes (D22 & 19)
6. the fuse itself (it should be 2 Amps

Hope this be of help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FIXYA.

Feb 12, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

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