Question about Cobra 29 WX NW ST 40-Channels Base CB Radio
This sounds like a problem with the diode matrix which pre-programs channel 9 on the PLL code signals. Probably the "channel 9" switch that activates these diodes is bad, so that the diodes are activated all the time preventing the channel switch to do its work. You will need a schematic diagram and a voltmeter to check the logic signals in this circuit. Start witht he switch; does the switch voltage change when you toggle the switch? If not; switch is bad. If it does, the problem must be "farther downstream" with the diodes itself.
Posted on Aug 24, 2010
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Posted on Jan 02, 2017
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