@frankhhh
I believe E-270 basically has the similar connection, Accuphase changed the color code on E-270 primary winding wires from E-260.
Sorry I can’t see the color very clear from your picture, please confirm if the setting shown on your picture is 100V Japan voltage? and also confirm if the colors are correct as following:
Pin 1 = None
Pin 2 = Yellow
Pin 3 = Orange + Black
Pin 4 = Brown
Pin 5 = Blue
Pin 6 = Red + Gray
Pin 7 = None
BTW, below is a picture similar to E-260 primary winding color code, except the blue wire should be violet on E-260.
Once you confirmed which wire belongs to which primary winding by a DMM, voltage conversion should be quite straightforward.