[ICOM] 75 PRO III Smoked!

[Jim n4uoz]

here is the site for service manuals   http://www.mods.dk/

-- 
Jim Sherwood,  N4UOZ
n4uoz at arrl.net




On 2/21/2012 4:30 AM, Stephen Budensiek wrote:
> 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....
>> ----
>> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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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/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
>
>