Hi!
Thanks for your answer.
So I resolved the problem yesterday night with this two shematics to help me.
schematics 1
schematics 2
the micro contact was tested OK.
so it was the micro capacitor c7 of 4.7uf was KO.
I tried a homing with the capacitor unsoldering and the printer was full ok.
So I get a new 4.7uf 16V capacitor on a old video transmiter (Im very lucky). Since this operation the printer is working very well.
I was a manufacturing defect of the board. The sticker "QC passed" is very funny!