[Elecraft] K2 - no TX power problem

[Gerhard Schwanz]

Hi,

I have a problem: No TX Out on my freshly assembled K2.

f = 7100
Vpwr = 5V
Valc = 7,5V
Power reading on LCD = 0.2W (desired 5W) 
Power consumption 440mA on 12,4V

At TP2 on transmit I get a nice signal on my oscilloscope, abt 0.005 Vrms

But behind TP2 the signal vanishes. All measurements are way too low, if present at all. At U10 Pin 4 there's only a short Jump to 5V and immediately back to 0 on keying. No HF detectable.

I unsoldered the Diode D36 and checked for resistance. Infinite in both directions. Does this mean what I think? This D is broken?

Do you need any more information?
What else could I check?

Thanks for any advice in advance!


Gerhard Schwanz
DH3FAW
mailto:gerhardschwanz at yahoo.de
http://www.gs-personal.de