Question about Icom F5021 Vhf Mobile 50w 128ch W Magnetic Antenna

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Icom f5021 blows power fuse Does it have a protection diode

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Should have one where the power wires come into the set. For the price of this radio it better have one.But thats not nessarily why it blows the fuses.It could be a power transistor thats blown or even the driver for it.Could also be an IC circuit.

Posted on Aug 13, 2014

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Posted on Jan 02, 2017

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All devices that are electronic and are not OEM have a diode in the unit that protects against polarity reversal. If it is ever hooked up wrong, the diode will short and the fuse will blow, the unit will not power back on until the diode is replaced.

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Could be blown protection diodes or if no audio a faulty capacitor close to the audio chip!
The protection diodes can blow if you were close by someone with a high power transmitter, then the diodes would blow kinda like a fuse to protect the rig, result no RX symptom!
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There should a small diode located near the power input line, "black in color with band on the one end" chances are it is shorted, blowing the fuse. This is a protection diode preventing a positive/negative mix up, if this turns out to be the problem check to make sure the audio is working, if not! you must replace the ic chip.

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1 Answer

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Hi,

Try checking the reverse protection diode. This diode would normally be connected right after the power connector and would be the biggest diode inside. One way to verify if this is defective and causing the fuse to blow is even with the power switch at the OFF position, the fuse will still blow.

If on the other hand, the reverse protection diode is good and fuse will not blow when power switch is at OFF, then the short/defective component is inside. There would only be two (2) major components that can cause the fuse to blow with the power switch to ON, the final transistor and/or the audio IC.

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

Good luck and kind regards.

Thank you for using FixYa.

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