Studio Spot 250 Focus

Hi!

I purchased a few Studio Sport 250. One has a problem with the focus. It does the reset allright, but if I ride the lens to the farest position, it does not come back :-(
If moved by hand, the motor feels very smooth. I tried to move the C-Clip on the Post a little down, but this did not work. Could it be the Driver-Chip?

Thanks for all advices.

UWE
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