Hi,

Does anyone has a clue how to connect this to the case? there's apparently no socket for the power and the manual does not say any. I've tried seraching aroud but i've not found anything usefull.
-- sntelectronics

I don't own one, but the picture on the Thomann website seems to show it:
https://bdbo2.thomann.de/thumb/bdb3000/pics/bdbo/9783218.jpg

I'm 99% sure that the long horizontal cable is the power connector (16-pin plug with a 10-pin cable).

EDIT
on https://doepfer.de/a155.htm there is a similar image that shows the power connector