Hi Peter,
The significant voltage could be the PLL chip PDOUT, U4 pin13. Check for
shorts on this pin that would give a zero reading. Not sure if the PLL chip
itself would support such a low voltage whilst working normally. Have seen
reported of odd effects with RFC15 the DC feed to the PLL chip U4 pin16, so
check
for actual DC continuity with this component.
What you do not appear to state and this is very important, is the VCO
oscillating or not?.
Checks with the K2 frequency counter at TP1 would at least help as an
initial test. The frequency read depends on the band in use and reference to
the
table at the beginning of Appendix B gives the range of VCO frequencies to be
expected. Tests with the RF probe/DMM at TP1 should give a reading between
600mV and 750mV according to the Elecraft trouble shooting guide.
Bob, G3VVT
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