[ICOM] my PRO III shut down problem

[Tony Hwang]

hamop wrote:
>      Thanks to all for the suggestions and trouble shooting expertise ..  I feel I do have a PRO III problem causing the shut down of power output after a few seconds of transmitting. It may well be a driver problem but usually if a driver is out completely it will not ‘come back’ after turning the rig and PS off for a few minutes and then work for a few seconds when turned back on, etc.  And I do not detect any increased power output right before this happens, so do not suspect increased current draw shutting down BOTH power supplies the same way. And shutting the PRO off by itself does not always bring it back up in a few minutes, usually requires turning off BOTH the PS and PRO for several minutes to get full power again. But that only lasts about 15 seconds of CW transmitting before shutting down again. Perhaps there is a trace problem with some small leaky capacitor shorting out two circuits.
>     Anyway, thanks for the advice and suggestions. Thanks for Reflector use. Happy 4th to all Icom followers. hi
> San K5YY
Hi,
Cause of shutting down is overloading due to several different reason 
such as over temp. over current, short, etc.
Have you tried with RF drive to minimum to see symptom changes?  Did you 
try with dummy load w/o antenna?
Did you watch the SWR reading?
Is the PSU going into crow-bar condition? Watch the Ic reading on the 
meter when it happens. If you can keep
the radio and/or PSU in a freezer and try it when it is cold.
GL es 73,
VE6CGX
Tony

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