[ICOM] 75 PRO III Smoked!

[Stephen Budensiek]

OK, I just found it, and downloaded it from
http://ebookbrowse.com/756proiii-service-manual-2007-pdf-d67230

   It's not real fast, so give it a little time to download,   If you
try viewing too far ahead of where it is downloaded, it will lock up
the download, and you'll have to start over again.

73's de Stephen, K0SD

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On Mon, Feb 20, 2012 at 7:21 PM,  <jkolin at optonline.net> wrote:
> I have a late production unit. It has the newer PA Board using MOSFETS as drivers and finals.
>
> 3 Days ago I was checking SWR on a new ant. 2/1. Key down w/100W for about 10 seconds. After a few SWR measurements power dropped to 5 W max. Then I could not go into transmit mode. After about a minute in receive mode, smoke billowed out of the rear panel from the PA compartment.
>
> Removed top covers and found 3 burned SMD resistors. R38, R39 & R40.  4.7 ohm. All 3 are in parallel.
>
> Anyone have problems with this newer PA board? I have not been able to find parts layout drawing that applies to this new PA board.
>
> Thanks for all your thoughts.
>
> Jay....
> ----
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