OK, seems there's little interest in this. So I'm throwing it away in a day or two, so last chance for power adapter here!
I checked roland's page, and it seems they charge $50 for these brand new ones + shipping. So I guess someone could save $40-50 on this one.
I can check the product number if anyone is interested. Shoot me a PM, if I don't hear anything in a day or two, it's going in the bin.
EDIT: No interest, so the adapter has now been trashed.