[Elecraft] K2 Alignment and Test Part II: VCO Test fails

[Matthew Ellis]

Hi,

I'm struggling to track down an issue with the VCO test in part 2 of the 
alignment for my K2 (page 64 in my manual).

The 4MHz Oscillator calibration looks OK as the frequency on TP3 shows 
as 12096hz stable (both on the internal test probe and an external freq 
counter).  The PLL test is in range as well.  But I get nothing (0hz) on 
TP1 for the VCO test with both the internal probe and a standalone 
frequency meter.

I've checked and re-wound/re-fitted Transformer 5, gone over my assembly 
with a magnifying glass a few times (both top and bottom side of the 
pcb), confirmed all the components in the VCO area are present and 
correctly oriented.  I've also used a signal scanner on the i2c lines to 
confirm the pll ic is getting the 'change freq' instructions.  Most 
voltages appear good compared to the manual, although the voltage on Q16 
C and Q17 G is off (initially 8v then dropped to near 0v after i 
re-soldered the joints of resistor R9).  I have shorted C60 to 
completely bypass the VFO ALC (suggestion from Elecraft).

All prior tests were fine, everything in expected range.  Also the 
correct frequency shows on pins 1 and 2 of U4 (MC145170), and voltages 
look good on U3,4 & 6.

I'm in the UK, so sending it back to Elecraft is not my preferred option 
(time/cost).

Has anyone got experience of issues in this area?

Thanks,


Matthew