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PRC-80 reverse polarity damage

taifun

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iI managed to damage my prc80 manpack by complete stupidity and now psu is not giving power to radio. is there internal fuses in radio or psu unit?
 

RFI-EMI-GUY

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I would follow the main power leads into the unit and look for a fuse and nearby a large diode to ground. This is normally how RP protection is handled. The diode may be shorted and fuse blown. Sometimes designers cheapen out and let the PCB foil burn up. You will need to replace the diode most likely. Water damage, reverse polarity and overvoltage are life ending for electronics. Water damage is by far the worst. You should probably check the power output after the fix because final transistors are often connected directly to battery with nothing but the fuse and diode to protect.
 

taifun

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Here is the picture of the board anyone know where to start
 

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RFI-EMI-GUY

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You need to follow the main power leads and look for damage.
 
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