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Side mic cobra 25 Classic

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smoke blower
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Side mic cobra 25 Classic

Post by smoke blower » Sunday, 07 May 2017, 10:29 AM

I need some help here I have a like new cobra 25 side mic radio that the channel selector won't light up . I put a new channel selector board in it and still won't light up what could be causing this

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Re: Side mic cobra 25 Classic

Post by smoke blower » Sunday, 07 May 2017, 10:34 AM

There​ isn't any voltage going to it only the little light that changes went you key the mic works

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Re: Side mic cobra 25 Classic

Post by smoke blower » Sunday, 07 May 2017, 10:37 AM

Forgot to mention there is no voltage on the bright and dim switch either

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Re: Side mic cobra 25 Classic

Post by sonoma » Sunday, 07 May 2017, 11:11 AM

more than likely you have a bad solder joint or a broken trace. if you will look at the schematic on the lower left side you will see where the feed to the lamps and led read out is right off the power switch. you said no power to the bright and dim switch either. so just start tracing the power on the parts in the schematic.
http://www.cbtricks.com/radios/cobra/25 ... ld_sch.pdf

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Re: Side mic cobra 25 Classic

Post by smoke blower » Sunday, 07 May 2017, 12:57 PM

I noticed that r84 is getting real hot

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Re: Side mic cobra 25 Classic

Post by sonoma » Sunday, 07 May 2017, 13:15 PM

look for a shorted cap or diode in the circuit with R84 or solder blob or even a trans.

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Re: Side mic cobra 25 Classic

Post by smoke blower » Sunday, 07 May 2017, 13:19 PM

I tested the transistor on the side of the chassis and it is good

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Re: Side mic cobra 25 Classic

Post by smoke blower » Sunday, 07 May 2017, 13:52 PM

I have looked everywhere for a splatter of solder I don't see anything so I will keep it for parts I don't know how to read a schematic I never could figure it out anyway thanks

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