[Elecraft] repost of K@ part II alignment and test problem

[Don Wilhelm]

James,

If you do not find a frequency at TP3 near 12100 kHz, and your probe is 
good, then the PLL reference oscillator is not oscillating.

Look at the schematic for the RF Board sheet 1 - all the associated 
components are shown in the upper left corner to the left of U4.  At 
this point, all are suspect - check and double (even triple) check the 
soldering of each one.  Be certain D18, D16, D17 and Q19 are oriented 
correctly (compare with the parts placement diagrams).

Nnow that you have the BFO built,  do a better check on your counter 
probe function - try the counter probe in TP2 and enter the menu for CAL 
FCTR - you should see the BFO frequency (4912 to 4917 kHz).  If you find 
something quite different than that frequency, then either the counter 
probe or Q9/Q10 on the control board may have a problem.   The BFO 
signal is weaker that the initial 4 MHz check and will show up problems 
with the probe/counter input circuits more readily.

73,
Don W3FPR

James Caruthers wrote:
> I am still having a problem getting by the part II tests.  I did find a problem with RFC15 and replaced it but I still have a problem when I run the cal fctr on tp3.  I get a rapidly changing reading which is now in the 1080 range.
>
> I checked d16, d17,c84, c85 and L31 per problem 235 on Appendix E page 8. The solders look good and item values are correct.
>
> I have rechecked solders on all boards and things look good  
>
>  Rechecked the probe per the Part I tests page 47 and get a good value of 3999.98
>
> Does anyone have a suggestion as to what else I should check to try and find the problem
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