Convert Accuphase C27 from 100V to 120V

Based on the image, I believe the white and blue wire that soldered to the connector block is incoming AC voltage.

1. Power up the C27 with 100VAC, use a DMM to to measure the voltage across the white and blue wire you should get 100VAC.

2. Measure the voltage across white and yellow wires and you should get a reading of 115VAC to 120VAC.

3. If you confirm the above reading are correct, swap the yellow and brown wire on both side of the connector block, so both yellow wires are connected to the blue wire.

4. Done. Voltage conversion from 100VAC to 120VAC is completed.

Congrats! Thanks for posting the result. Please confirm if the 120V wire configuration as following:

Black to Black

Yellow to Yellow  >  Blue soldered wire

Brown to Brown

White to White  >  white soldered wire

This may helps other members if they want to do the conversion, thanks.