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Re: FT-847 Disaster



FYI - My 847 blew one of the regulators a few months back. I have used this 
radio a LOT over the years via satellite and the Houston AMSAT Net. It has 
performed well, but I did have to replace a front-end preamp transistor (2 
Mtr) about 4 years ago and a regulator - just recently. Other than that, it 
has been fantastic. The FT-847 has been the best do-it-all rig I have owned.

Andy W5ACM

----- Original Message ----- 
From: "Art Goldman" <aegoldm@verizon.net>
To: <k7zt@suddenlink.net>; <amsat-bb@amsat.org>
Sent: Monday, December 24, 2007 11:03 PM
Subject: [amsat-bb] Re: FT-847 Disaster


> Joe:
>
> I have the Tech manual. I took a quick look at the schematic, but could 
> not
> find any obvious protection diode.
>
> The Power circuit goes through a filter consisting of several caps plus a
> choke, and then to a fuse before going to the power switch.
>
> After the power switch, 13.6V feeds the input of several 3-terminal
> regulators. It's late now so in the AM I can scan the pertinent portion of
> the schematic and send it to you.
>
> All of this is on the AF-Cntl Unit board. The fuse is marked FH1001 and
> appears to be at least 1.5" long. It is located on the short side of the
> board just above and slightly in from two regulators that are mounted next
> to each other in a notch of the board.
>
> Perhaps you'll be lucky and all that blew was the fuse....
>
> More tomorrow.
>
> 73,
> Art N3OY
>
>
> -----Original Message-----
> From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On
> Behalf Of k7zt@suddenlink.net
> Sent: Monday, December 24, 2007 5:26 PM
> To: amsat-bb@amsat.org
> Subject: [amsat-bb] FT-847 Disaster
>
> All:
> I'm afraid that I reversed the polarity when I connected my FT-847 to its'
> power supply.
>
> It appears that the smoke leaked out :-/  I would like to know if anyone 
> out
> there has had this unfortunate experience (names withheld), or has an idea
> where to begin looking for the problem.
>
> Thanks,
> - Joe, K7ZT
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> _______________________________________________
> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
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