:-((
with the AC Adapter
the printer Blue LED and the Ulticontroller
are not switching ON anymore,
but the circuit FAN and the circuit LED are ON.
and because via USB it's seems to work everything,
I launched a test with USB + AC Adapter together connected.
I runned a bed levelling wizard with Cura,
and it work fine, even the ulticontroller it work fine,
BUT
in the moment I disconnect the USB cable, the ulticontroller go OFF,
and the blue led on top of the extruder too.
Another problem to solve ...
somebody can help me out?