Geeetech

do you guys know if the problem is in the transformer or in the power supply unit?

Hi!,
Today i tried printing something but my geeetech e180 wont turn on.
I have checked the transformer as well as the printer but cant find anything wrong with it. Im going to test it with a multimeter today.
Can somebody tell me where should i get the 12v reading? and can somebody tell me what PSU ...