[amsat-bb] Re: FT-847 Disaster

Art Goldman aegoldm at verizon.net
Mon Dec 24 21:03:55 PST 2007


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.

Art N3OY

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of k7zt at suddenlink.net
Sent: Monday, December 24, 2007 5:26 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] FT-847 Disaster

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.

- Joe, K7ZT
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