[Elecraft] k2 pll and ref osc issues n0xdb

[Don Wilhelm]

Foxjazz,

Do you have a real name and a call?  We here on the Elecraft reflector 
certainly would like to know if you do.

Q6 on what board has the bad resistance reading?  The Q6 on the RF board 
has nothing to do with your PLL problem.

Is it at TP3 that you are getting a reading of 0.00 kHz?  If not, let's 
start from there.  The most likely source of no reading at TP3 is a 
problem with RF Board Q19.  And the problem wiht Q19 is most likely 
soldering somewhere in that circuit.  Turn to the schematic  for the RF 
board sheet 1 and look in the upper left quadrant (up to but not 
including U4) to identify all the components associated with the PLL 
Reference Oscillator.  Check the resistance from the source of Q19 to 
ground - it should be close to 270 ohms - if it is higher, check the 
lead tinning of RFC14.

You may have a solder bridge on the thermistor board (notice on the 
schematic that it is one of the components associated with the PLL Ref 
Osc).   Make a quick check - the voltage on pin 5 of RF Board U6 should 
be very close to 1/2 the voltage on the 8 volt rail (check that at U6 
pin 8).

Have you checked to be certain the counter probe is still working 
properly?  To check that, put the probe into TP2 to read the BFO 
frequency.  If that also reads 0000.00, you have a problem either with 
the probe or Control Board Q9 and/or Q10.

Please be specific so we can help you better without creating a 'wild 
goose chase'.

73,
Don W3FPR

Foxjazz wrote:
> Hello Elecraft,
>
>   Hello Don,
>
>
>   I had the pll working before I did phase 3 and put the ssb board in.
>
>   It was working great, now it isn't. I thought I would run a quick
>   voltage test before continuing. Now the pll freq is 0.000
>
>   I reviewed the test results and re-tinned T5 just to ensure good
>   conductivity.
>
>   When I ran the resistance checks the base resistence of Q6 was at
>   372 ohms not 100-140 as the book says.
>
>   the unit turns on draws 0.24 amps
>
>   0.22 without the ssb board in.
>
>   Why would the pll circuit just quit working, would q20 have anything
>   to do with it?
>
>   The voltages at q18 are a bit high.
>
>
>
>
>
> I had the pll vol
>
>
>