My solution was to change the original power inlet (mains socket) of the keyboard with a Euro IEC C14 power chassis inlet. Now it is ready to run with a standard power cable which you can find on nearly any computer or other electrical component.
What you need to do this, is a kind of file, the Euro IEC C14 power chassis inlet with the proper cable and a soldering iron.
The change of the chassis inlet was very easy: open the keyboard and loosen the two screws which holds the socket (it's more easy for you if you remove the plastic cap from the PWR Supply also). Disconnect and remove the old socket. Then take a file (or what ever you prefer - I used a Proxxon to speed up things a little bit) and widen the original opening very slightly. Solder the connecting cables from the old Yamaha socket to the new Euro socket, an install it. Close the keyboard und have fun :-)
Maybe this sounds very tricky and sophisticated to you, in fact it took not more than 20 minutes for me (if you have anythig you need at hand).
This works not only for PS-6100 but also for Yamaha PSR-6300.
I have tried it on another computer with pen-drive. It woks. Can you help me find that file??????????
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