Peter,

I had made a correction on this posting. The switching of 2 wires was in reference to the Ketron SD1/SD1Plus and not the Tyros 3.

In the Tyros 3 (as you did see for yourself), the power board does take 240v. However, depending on which country these get shipped to originally, the company labels the voltage of that unit to correspond to the voltage in that country. It is easier these days for them to use one power supply board on all keyboards within the same series than separate ones. The fuse is what might need to be changed.

(From my point of view now) such labelling also helps prevent trans-atlantic retail trade.