[Elecraft] K3: sub-rx won't work

[DM4iM]

Guys, i still could not solve the problem with the sub-rx.
Over the weekend i opened the K3 and checked all TMP-cables,
they are in their correct places.
The pins of the sub-out and the sub-in board are correctly mated with
their sockets.
The Aux-DSP ist seated correctly etc etc..
In short, to me everything looks fine.
I carefully read the manual in order not to make any mistakes with the
antenna-connections and/or the selections of the antenna inputs.

The sub-rx *will not work*.

I have :

Noise , but no band noise.
Faint signals, but this might be a leakage from the main-rx.
A 2.8khz & 400hz filter in position FL 2 & 3 , so even if i counted the
positions backwards , one of them should work.

So, what can i do? Can i swap some connections to pin down the defective
board?


-- 

73, DM4iM