[Elecraft] K2 Tuning problem

[Don Wilhelm]

Mike,

You most likely do have a thermistor board problem - a short from pin 2(and
3) to ground (pins 4 and 5) could cause the situation you describe - in that
case, the op amp would be producing full output with any voltage input above
zero volts.

73,
Don W3FPR

> -----Original Message-----
>
> My K2, #5943, is having a bit of an issue. I've just finished the last
> construction stage (except for final assembly) and have yet to do the
> final alignment. The issue is, I've got a problem somewhere around U6 on
> the RF board. During CAL PLL, its input from U5 decreases steadily in
> voltage, as it should, except its output remains at a constant 8 VDC.
> During normal use, the VFO display acts normal but I can effectively
> only tune in approx. 5 KHz intervals, due to how the K2's fine tuning
> works. Examining the board did not show any shorts anywhere around U6 or
> on the thermistor board. Any ideas?
> --
> 73, Mike
> KCØTQX
>
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