[Elecraft] KNB2 - can´t bring it to work

[Karsten Eppert(DK4AS)]

I have sharp pulses on all bands hitting the band about once per second, 
which the noiseblanker of my old IC 735 kills, but not so my K2 S/N 4765.
I can - more or less - read a circuit diagramm (I don´t understand each 
components function in detail  yet) I´ve tried some signal tracing, 
couldn´t identify a faulty component and can´t find out, what is wrong.
Is there an info-sheet available, what has to be seen with a 
dual-scope-oszilloscope at which point and at what siganl level?

73
Karsten
DK4AS