In this case, I want to change to 220-240v.J1 = 100v
J2 = 120v
J3 = 220-240v
So if you want to change input voltage to 120V, just simply move the jumper wire to J2 or move it to J3 for 220V-240V.
I didn’t see any standby transformer or J4 and J5 on the pictures, please make sure there isn’t a standby transformer hiding somewhere, otherwise the transformer will be fried when power up with 220/240V mains voltage!
if you would tell me how to solder a jumper wire. Do I need to pierce on the board before soldering a jumper wire?Accuphase gears are expensive (to me at least), if you need to ask this question, no offense, I suggest you find someone with electronic and soldering skill to do the conversion for you.