Problem with my circuit card

I have a problem with my circuit card. I can’t get the engine which operates the extruder in the vertical z-direction to function. I have tested several possible sources of the failure. It’s nothing wrong with the engine that lifts the horizontal beam nor with the contacts. Finally I came to the conclusion that there must be something wrong the circuit card.

I wonder what I have to do now?

Can you change the little driver board of the Z axis with one that you know that works (X, Y or extruder) (do not forget to do this when the board is not connected to the power) and see if the Z axis moves then?

I have already tried to do that but then instead the driver board of the x, y or extruder respectively doesn’t work. I think that there is something wrong with the circiut card.

You can send the broken driver board to:

Velleman Repair Service
Legen Heirweg 33
9890 Gavere

We will send you a replacement part asap.

thanks so much.
I’ll send it tomorrow