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Yaesu FT-50R battery drain

My Yaesu FT-50R will drain a battery in just a matter of a couple of hours. I think there must be a short because the heatsink gets hot (even when the unit is off). I purchased the unit new in either '98 or '99. I chenged the knob out a few years back, and that has been the only other problem. I hope you can help.

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  • scotwho Feb 20, 2008

    Addition;

    The radio still works. However, it will go through multiple 700 and 1100 batteries. The battery packs are still good, just drained.

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I also have a Yaesu FT-50R with the battery drain and overheat problem. I took it to my technician and in my case the issue was with a reverse polarity diode. My technican checked all the other comonents and found that this diode was shorted and causing the radio to drain the batteries and causing the radio to get warm. Once he replaced the diode the radio stopped draining batteries and no longer gets quite warm.

Posted on Aug 24, 2009

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I have the same radio.

Does the radio work? Could it be the battery that's getting hot?


Geno

N8BHG

Posted on Feb 20, 2008

  • Gene Wells Mar 05, 2008

    Since the radio works, then the outputs can't be shorted. I would guess that there's something wrong in the TX <> RX switching circuits. If it's keeping voltage on the TX DC while receiving the RF circuits could drain the battery.



    BTW, I have the same radio. I would recommend sending it back to Yaesu for service. Unless you really have a desire to get out a VOM and print and do some checking yourself.



    Geno

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Scotwho, I personally do not know the radio you are asking about, but I do have many years working with radios in troubleshooting. What I am guessing is, if the heatsink gets hot, then whatever is connected to the heatsink has shorted out. Two main parts come to mind here, and that's the audio chip, and the transmitter output final/chip. Possibly the main IC (brain) that controls most everything, but I doubt that. The radio needs to go to a repair shop that can troubleshoot the damage/ and find an answer as to why it occurred. A lot of times the factory's do not use heatsink compound when they assemble the units, and after an x amount of time the part/parts will fail. 10cents worth of heatsink compound can make a radio last a few years longer.
Probably not the answer you wanted but I hope this helps,, let us know. Mechanic

Posted on Feb 20, 2008

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