Hello from Canada.
I apologise for not writing in German.
I have an anti-skating problem with a 1229Q. The calibration of the dial is very wrong—there is always much too much force in relation to the number scale, and with the turntable set absolutely level, the tone arm zero balanced, and the anti-skating set to zero, there is still a small amount of anti-skating force applied to the arm. It drifts outward until it is stopped by one of the shut off links under the turntable. Turning the turntable over and having a look at the anti-skating mechanism, I see that the red sealing paint on the hex nut for the cam and the arm set screw is broken, and things look a bit strange. Some one has done something to it.
Ref:
Thread
Specific post with pictures of the 1229Q anti-skating mechanism and screenshots from the service manual.
Thank you for your kind attention.