Question about Cobra 29 LTD CB Radio

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My Cobra 29 ltd classic

My cb is smoking at the button controls and smells like burning.

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Hello MyPete,

You have some form of short circuit in your CB, most likley I would suspect the Power supply or the RF Power Output Amplifier. Here are some basic instruction on how to tell wher the smoke is coming from.

1) disconnect and remove your CB from your vehicle and put it on a workbench
2) remove the cover from your CB and expose the circuit board to view
3) connect your CB to an external 12 volt power source and antenna or a dummy load
4) power up the CB and determine where the smoke is coming from then turn off the power supply to the CB
5) At this point you will need a schematic of your CB (get one from www.servicemanuals.com)
6) find the point on the schematic that relates to the point where the smoke is coming from
7) using a ohmmeter determine which component and or components are shorted
8) replace the shorted and or malfunctioning components.
9) test the system (power on, transmit and receive)
10) close the unit back up
11) reinstall into vehicle
12) run tests again.


This should help

Thank you
Shutle832

Posted on Nov 01, 2008

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