Voltage conversion of Accuphase E-650

@leecc73 

It look like a stand-by board, what is the amplifier model number? Can you post a photo of the back of this PCB? Where those brown, blue and red cable came from? 

This from E5000,  i think soft start.

as usual , if not wrong the plug need to shift for 230V, any suggestion?

If only shift the 2 row pin plug should be easy

@leecc73

Thanks for the photos.

I think the brown and blue cables are "live and neutral" come from the AC mains IEC socket, the small transformer is connected to it via a resettable fuse (F1), and the K4 is connected to the front panel power switch.

When the front panel power switch engaged, RELAY1 energized and close the contacts to power the main transformer.

I believe Accuphase made three versions of this board for 100V, 120V and 220/240V mains. If you want to convert to different mains voltage, a new board or install a small transformer with correct primary winding for the applied voltage is needed.

Thanks for the analysis, do you know what kind of miniature transformer is it?

If i turn it on with higher voltage, will it burn? or the fuse will gone.

or i just simply not able to turn on?

what is see the red wire kind of link (by pass) from this board and go over to the next board which allow for the main transformer to have the voltage change.