[amsat-bb] Re: FT-847 Disaster

[Art Goldman]

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 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 
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