Sorry, but I forgot to mention that I did the readjustment [without scope], but things stay the same. But it was remarkable that:
2. the signal did not get as high as before, when turning fully with the Shift knob. And it hears like the signal is not a real sinus/cosinus; its a bit different like before.
Today I remembered I tried to make the simple A126_A143_9_connection years ago. But something went wrong and I decided to cancel the mod, because other things got priority.
And now I wonder if I try it again succesfully, that I do not need the internal osc.
And if it then works well with the extern osc of A143_9, can one say that the CEM was broken?
Thanks for offer repairing, but I want to challenge it, otherwise I just wait for the upcoming new FS.