[ICOM] 75 PRO III Smoked!

[Stephen Budensiek]

Jay,
   Don't know if this will be of any interest to you, but I found a
IC-756ProiiiServiceManual2007.pdf somewhere on the internet, don't
remember where.   Just checked it, it shows the drivers as being
RD15HVF-1 FETs.   It a full service manual, with parts, layouts,
voltages, it's a 29 mb file in a zip, that you can unzip into a pdf
file.   I was looking at a Pro3, wanted to see what I could find, and
found this, along with a earlier Proiii service manual.   It may have
been the German site that has lot of Icom and other stuff on it, but
can't remember for sure.   It has a very long file name, something
like "IC-756PRO3_Service_manual_REVISED_June_2007 at magfmegfld.zip"  on
the download site.   Wouldn't mind sending it to you, but not sure how
I could upload a 29 meg file via my email, think Gmail limits me to
something like 8 meg.   Let me know if I can help you.

73's de Stephen, K0SD in So FL

**************************************

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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