[Elecraft] K2 problems

[Don Wilhelm]

Scott,

You apparently have no BFO, and the product detector will not produce 
output signals without a BFO, so the lack of audio is to be expected 
with no BFO.
To make email communications simpler, look at the RF board schematic 
sheet 2 and locate the components in the lower right corner (labeled 
BFO).  Check and re-check all those components.  If you have a separate 
set of eyes available, ask that person to examine it too - often someone 
else can spot a problem that we have overlooked many times.

Make the DC voltage checks at U11 just to be sure it has voltage to it 
in the right places.   You can also check L33 for continuity to be 
certain you have properly soldered those tiny leads to the resistor 
(actually an insulator with leads).
Be certain D36 and D37 are the right types, and are oriented correctly 
(check the parts placement diagram at the back of the manual to verify 
orientation).

Once you are convinced that all above is correct,  build up the RF probe 
from the parts provided with your K2 and measure the RF voltage at U11 
pin 6 (should be 70 mV rms or greater).

73,
Don W3FPR

wsm at amaonline.com wrote:
> Hi
> I'm building a K2 and had a problem with not being able to 
> adjust L30, which I got corrected with Don's help. 
> So all test and alignment procedures have gone as they were
> supposed to up until the BFO test. I get no frequency reading
> on TP2, and have no audio from the receiver. I've re-soldered
> all the joints and checked all components, and there were as
> they sould be.
> Anyone have any ideas?
> Thanks
> Scott N5SM
>
>