I got in late last night, so apologize for the delayed response. My Tyros2 owner's manual (english-american) states this on page 3, under IMPORTANT SAFETY INSTUCTIONS:

"2. Main Power Supply Verification: Yamaha products are manufacturered specifically for the suppply voltage in the area where they are to be sold. If you should move, or if any doubt exists about the supply voltage in your area, please contact your dealer for supply voltage verification and (if applicable) instructions. The require supply voltage is printed on the name plate."

The metal name plate mounted to the underside of my Tyros2 (purchased here in the USA) reads:

Model: Tyros2
120V
45W
60Hz
Made in Japan


Scott