[ICOM] power supply

[John Hagle]

Harold Sullivan wrote:

> Thanks John for the info: I have come to the same conclusion on 
> testing of components. I know that switcher power supplies can be 
> strange in operation and a component that is out of spec won't let one 
> of these poer supplies run right. I have a pretty good lcr tester and 
> I will check further to see what i can find. I have loaded the 28 and 
> 13 volts down a little thinking it might require some load to get 
> started. No help in trying that before. I hope I can get it to run 
> again. I know the radio is fine. 73, Harold
>
>
>> From: John Hagle <jhagle at madbbs.com>
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>> Subject: [ICOM] power supply
>> Date: Sun, 07 May 2006 14:08:22 -0400
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>>
>> The power supply may need a minimum amount of a substitute load on 
>> the 28volt lines you have disconnected. Otherwise, the supply may 
>> shut down even if you do get it to initially and momentarily power 
>> up. A couple of resistors would do the job.
>>
>> I would recommend testing all electrolytic caps in the primary 
>> section of the supply. These should be tested for value, and if you 
>> have the capability, test for ESR-equivalent series resistance. If 
>> the caps are okay, then look for failures in the solid state devices 
>> like transistors, diodes, optical couplers.
>>
>> Good luck to you.
>>
>> 73
>> de N2JH
>>
>>
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>
>
>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>
>
how did you make out with the power supply repair?