Question about Cobra Radio Communications
Posted by Anonymous on
The same way you took it out. make sure the arrow is facing the right way.
Posted on Nov 25, 2014
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Posted on Jan 02, 2017
Most cb radios have protection diodes that are made to burn out to save the radio in this situation. Usually you can replace them with a rectier diode between 1n4004 and 1n4008. They can be purchased at Radio Shack, or if you need more stuff, you can get them from Parts Express. This unit is the same as a cobra 29. If the pc board layout and numbering is the same, then the protection diode number is D23, which is located in front of the pa speaker jack on the main pcb. If you need more help, feel free to email me at email@example.com.
Posted on Jan 26, 2008
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When the power was reversed this shorted out one of the components, possibly an Operational Amplifier. This tells me that there is no diode protection and possibly the circuitry is exposed directly to the input power supply. The fix would be to find the shorted component with the use of a schematic and a multimeter. Once you correct the shorted component then if possible you can add diode protection by putting a diode (forward biased direction) in the path of the positive line.
Again you will need a schematic, and a multimeter to work on this problem.
I hope this helps,
Oct 12, 2007 | Uniden PC78ELITE 40-Channels Base CB Radio
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