If I remember it correctly, if power lost then restored, motor should go to it's east limit, then to the last sat/channel position.
If no channels were saved, and receiver is in factory state, motor should go to the east limit, them to "reference" (0 position).
How does one know that "position 0" is lost?
By sending motor to "reference" and seeing that it stops every time in different place? I know that my motor
SM3D12, which is in repair now, sometime went to East limit, and got frozen there. But it never lost it's "reference" or "position 0" which is a physical point in the middle of the shaft travel. It just could not go there (or to any other point), because of getting stuck at East limit point, which coincides with AMC sat at 79ºW, so, every time, it "loses position", I was checking a KTEL channel, and it popped up rihgt away, because motor was already there!