[Elecraft] Q7 failure in K2
N9AUP
imjustgeorge at comcast.net
Sat Feb 18 17:39:56 EST 2012
Thanks Don,
I've now pulled the remains of Q7 and also removed Q8. I checked the bias
and it is at .64 volts and present at both base pads. This is a K2/10, so
does that rule out the static antenna charge theory? I have a sort of crude
transistor check which consists of connecting ohm meter - to emitter and +
to collector (NPN) then touching my finger across base and collector to see
if resistance decreases. If that means anything in this case, then Q8
wasn't totally destroyed. Of course, I'll buy the K2PAKIT and install the
matched pair.
I note that the receiver mode seems to be working just fine. I pulled the
controller board and turned power on and off to do a relay reset per the
manual. 40 through 10 meters are open at the moment, the relays are
clicking and I have reception across the board so the relays/filters must be
ok.
Can you suggest anything else to check?
73,
George
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