[Elecraft] K3 sudden loss of RF power output

[Vic Goncharsky]

Hi Charlie,You need to go backwards from the antenna connector to T/R switch then, to the final transistors, is there an idle current when you  PTT? Then go to the driver stage etc... I am actually doing almost the same kind of repair now - The bias voltage in my VHF transistor 2m amp just disappeared and there are only 2 days left B4 the major VHF/UHF contest event of the year this weekend.
73 Vic US5WE/K1WE K3 #2907
--- On Wed, 7/1/09, Missouri Guy <n0tt1 at juno.com> wrote:

From: Missouri Guy <n0tt1 at juno.com>
Subject: [Elecraft] K3 sudden loss of RF power output
To: elecraft at mailman.qth.net
Date: Wednesday, July 1, 2009, 10:21 PM

Hi Gents,

K3 sudden loss of RF power output:
I was operating the FD event over the weekend...had a nice
pileup going...I heard a "pop" in the headphones and discovered
that there was ZERO RF power output when there should have been
100 Watts.  Receiver was OK and the radio was otherwise "acting" 
normally as when switching from receive to transmit.  
Circuit breaker not tripped.

I want to do some troubleshooting before (and if) I send the
radio to Elecraft.   Per a Google search, this has happened
before to others and a bad Q8/Q9 and R66 on the RF board 
might be suspect.   Anything else on the list?

Thanks,
Charlie, N0TT
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