Thank you Wasedadoc, I'll do that but I think, if there is a 120/220 switch, maybe is inside.
I smelled inside (LOL), no problem, don't smell burn, actually smell like new, there is no dust inside.
All the screws were tight like from the factory, and one had a protection seal.
I'm attaching the service manual, I think page 113 shows this 120/220 switch.