Hy sirs ! I am new to this forum but I went trough the same problem as you Nailz w/ a polo mtc 9000 Hantarex monitor (it's indeed the common monitor in europe).
So i had to power it like that :
* Ac main > electrical filter > isolation transformer and then to the connector ! That is the all point you have to know what corresponds tou your pins
*ok you go from the ac plug w/ 3 wires (green yellow is the earth, black and blue don't matter as it is alternative power)
*you go through the filter (please visit purple Mame web site
http://mame.how.to ) and then through the isolation transformer.
*Good now you usually have +/- 10 % 128V to power your monitor and sometimes 220v for the degauss ...
*forget the earth as it has been soldered to the filter !
Mine works great w/ that configuration but you should find interesting ressources on the purple mame web site
good luck