[Elecraft] More problems with K2 #5061

[M. P. Haynes]

Hello again folks,

A week or so ago I contacted Gary about a problem with excessive current
on Q6 when I was trying to do the 40 meter transmitter cal.  Turns out
that Q10 was shorted driving the base to 4 volts key down.  Replaced Q10
and that problem is fixed.

Now, however, the VFO is inoperative.  It had worked FB before and the
receiver seemed very hot.  Now I can hear background noise and QRN but
can't tune in stations.  The readout changes like it should but the
oscillator stays at one frequency.  I verified this with an external
frequency counter as well as the built-in one and same with a spectrum
analyzer.  The oscillator is running and it puts out RF as it should but
not on a given frequency.  With 80 meters selected I get the following
frequencies; TP1 7788.6, TP2 4914.17, TP3 12092.17. I checked U6B pin  5
and get the 4V ref, pins 6 and 7 never change their values regardless of
turning the frequency knob.  Am I overlooking something?  Is there some
hidden menu I might have activated?  I was very careful when removing and
replacing Q10 and besides, it isn't anywhere near the affected circuitry.
 Any ideas?

73,

Pat Haynes-K4BEH