Machine:

LPKF Laser & Electronics

Protomat S62

Type: S 62
Year 2005
V 115/230
Hz 50/60

Machine is unable to find reference point (zero point). Many people have been trying to fix it, but no help.
Even Finnish resaler company sent mechanic, but no help.

Have anyone else had the same problem?

Is it a software on hardware issue?

How is it even supposed to find reference point, is there a limit switch or what kind of other sensor?

I do not have the unit in hand atm, it is at my friends work.

Yes, I know it is hard to find problem via internet, but that is why I ask here if it is a known problem, or even one person had the same and fixed it.