Voltage conversion of Accuphase C-2300 to from 100V to 120V

@imhififan

Here are pictures of the board:

C-2300_1 (13).JPG

C-2300_1 (14).JPG

Thank you in advance.

@foolishman 

Please post a photo of the reverse side of the board.

@imhififan

Here are photos of the reverse side of the board.

C-2300_1 (15).JPG

C-2300_1 (16).JPG

C-2300_1 (17).JPG

Thank you in advance.

Thanks, I believe moving J1 and J4 to the J2 and J5 positions should convert the voltage from 100VAC to 120VAC.

However, measuring the corresponding transformer wire DC resistance to confirm if my assumption is correct, the 100V tap should have the lowest DC resistance, the 120V tap should be slightly higher, and the 220/240V tap should be about twice the DC resistance of the 120V tap.

To measure the DC resistance of the transformer primary winding, plug the transformer wires into sockets K1 and K2 and remove the jumpers (J2, J5) before measuring.