Adjusting input voltage of Technics Hifi Equalizer to work in the EU

[FBMinis]

A friend gave me his Technics equalizer he brought from the USA here to Portugal, he told me "it should work as is" but looking at the setup and considering they use 110V in the USA compared to 220V here, I am confused.

Here is the setup as he gave it to me:

here is the schematic for the device (under the chassis there is a rotary switch to set input voltage):

Do I just need to set the module to 220V and replace the US plug with an EU plug?

What was the logic behind using the transformer to convert 220 to 110 and having the module set at 240? He told me it was working like that (I have yet to test it but the fuses are intact).

[Benta]

Replacing the plug and setting the voltage should be enough. Make sure that someone hasn't fiddled with the switch.

[FBMinis]

What would happen if the unit was set to 240V while powered through the step down transformer (110)?

[wraper]

What would happen if the unit was set to 240V while powered through the step down transformer (110)?

No damage will happen. Probably it would still work with reduced performance since it's fully analog and reduced voltages likely won't make it completely inoperable.

[FBMinis]

The reason I asked was that the previous owner told me this setup was working here in Portugal with the 220V being converted to 110V and module set to 240V, which confused me.

[BrokenYugo]

Probably best to set to 240 in a nominally 230V country, unless your service measures in the 220-230 range.