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Re: FT-847 Disaster



Don't feel too bad Joe. Just last month I fried my IC-756 HF transceiver
radio. It now sits in the scrap bin at the Icom repair facility. A $900.00
loss. All finals and predriver transistors blown and a repair bill of over
$500.00 so I had it scrapped as I am sure other components were also close
to blown and would probably fail on its return back. It will be awhile
before I can get a replacement so pretty much out on all bands from HF to 6
meters now. The FT-847 is absolutely the best radio ever built for satellite
and EME work.

73,
K7XQ Jeff
Atwater, CA.
Grid: CM97qi
EME, Satellites, Meteor Scatter
CW, JT-65 , SSB
50 MHz: 2 X M2 6M7 1000 watts 2 X 3-500
144 MHz: 4 X XPOL M2 2MPX28 XPOL 1500 Watts Single GS35b
222 MHz: 1 X M2 5 W.L. 350 watts   Single 8930
432 MHz: 4 X M2 9 W.L. Modified for XPOL 1500 Watts single GS35b 
1296 MHz: 3.0 meter dish VE4MA circular feed 350 Watts single GS15
water-cooled
2304 MHz/2320 MHz/2424 MHz: 3.0 meter dish VE4MA circular feed 200 watts
Spectrian SSPA 
10 GHz: early 2008
 
K7XQ Webpage:  http://www.elite.net/~k7xq/k7xq.html

-----Original Message-----
From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On
Behalf Of k7zt@suddenlink.net
Sent: Tuesday, December 25, 2007 6:58 AM
To: Art Goldman; amsat-bb@amsat.org
Subject: [amsat-bb] FT-847 Disaster

Many Thanks for all of the responses and Merry Christmas to all!

I have done some preliminary troubleshooting and have discovered the 
following...

The fuse and the electronic cap are fine.  I get good voltage to one side of

the relay, the relay coil appears to be energized but the 12 VDC stops at 
the relay.  I did jumper the 12 volts to the other side of the relay and the

display lights up and I hear noise from the speaker. But no frequency 
displayed.

This is as far as I've gotten.  I did note on the schematic that the relay 
has two transistors (Q1118 & Q1122).   Q1118 is labeled as H-V Protection on

the block diagram. Both of these devices connect to the relay (FL1001). 
I've looked on both sides of the board and can't seem to locate these 
devices.

Regards,
- Joe K7ZT

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