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....
73, Art N3OY
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, December 24, 2007 5:26 PM To: [email protected] 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 _______________________________________________ Sent via [email protected] Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb