[amsat-bb] Re: FT-847 Disaster
aegoldm at verizon.net
Tue Dec 25 07:14:05 PST 2007
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.
From: k7zt at suddenlink.net [mailto:k7zt at suddenlink.net]
Sent: Tuesday, December 25, 2007 9:58 AM
To: Art Goldman; amsat-bb at 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
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
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
- Joe K7ZT
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