Question about Magnum DeltaForce CB Radio

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Magnum s-3 well hope someone can help me. i have a magnum s-3 that when powered up goes to channel 9 when it does this there is no rx or tx..when radio warms up it will act just fine ..after it starts working as long as you dont kill the power it will work fine all day and night..thanks for any help

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Most likely cause is a weak electrolytic capacitor in the frequency synthesizer circuit or a voltage regulator that feeds power to it. As they age, these capacitors, which contain a viscous acidic electrolyte, can dry out but will function when warm, at least for a while, before they fail completely.

Posted on Sep 26, 2008

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WHEN I KEY THE MIKE THE NEEDLE ON THE RADIO GOES FROM 3 TO 1


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"WILDCAT" IN LAURELVILLE OHIO
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Road king 56 4 pin mic


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Magnum 257 No Audio Being Transmitted


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1 Answer

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Hi,

D23 is the reverse protection diode and it shorting is the primary reason your fuse blew. As you posted, power was applied in reverse, hence other components would also fail. Pls check:
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2. TR23 (2SC1096) 9 Volts regulator
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6. TR15 (2SC2028B/20) - Driver
7. Most capacitors over 220uF (like C123, C114 & C112)

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

Good luck and kind regards.

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