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
Q1122 is a surface mount transistor (2SC1623) just above the relay. Q1118 is a DTC114TK, and it's on the bottom of the board just about underneath Q1122. It's also a surface mount.
Good luck, Art N3OY
-----Original Message----- From: k7zt@suddenlink.net [mailto:k7zt@suddenlink.net] Sent: Tuesday, December 25, 2007 9:58 AM To: Art Goldman; amsat-bb@amsat.org Subject: 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
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
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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
participants (3)
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Art Goldman -
K7XQ -
k7zt＠suddenlink.net