[Elecraft] K2 Deaf

[Don Wilhelm]

Rob,

Look at the mixer carefully, especially the silkscreen outline on the board.
If it is installed backwards, the results will be much as you describe.

If the mixer is installed correctly, then you may have to build up the 
oscillator shown in Appendix A (or use a signal generator with much more 
output than the XG1 or XG2 can provide) and do the Receiver Signal 
Tracing steps shown in the manual Appendix A.

73,
Don W3FPR

On 10/29/2013 6:30 PM, Rob Gault wrote:
> Initial receiver testing on 40 Meters (pg 67) can barely hear XG2/XG3 @
> 50uV.  I've injected the 50uV from the XG2 directly to the input of the
> rcv. mixer Z6 @ R73, no change.  VFO Input to the receive mixer looks good
> on a scope, no IF signal to be found at pin 1 of J12.  Q22 voltages
> nominal.
>
> I've eyeballed all solder connections and Caps and Resistors and confirmed
> values.
>
> We have confirmed the injection and testing procedure on a known good K2,
> lots of IF signal at J12 pin 1.
>
> Looks like Z6 is the problem?  Any other ideas or thoughts?
>
>