Preher TV
Member
I have the piano. It takes between 40 - 100mA. It just has five AA cells. You just need a 1 watt zener to drop the voltage from the plug pack.
Is this the keyboard, Because according to the specifications it does not draw 40-100mA it consumes 1.6 Watts at 7.5V which is around 213mA.
https://www.casio-europe.com/euro/downloads/emi/SA-45_en.pdf