Are there any knowledgable Are there any Technics guys out there who know about Technics cassettesette players ?

I know it's not a keyboard question but I have always used a cassette player to record audio from my organ when mixed with the accompaniment from another instrument such as the KN7000.
I mistakenly bought a Technics twin deck cassette RS X911 unit not realizing it was part of a three unit set which took it's D C power supply from that and not from the 240 volt mains, consequentially it is unusable unless an alternative supply could be used.

The feed in is through a small 3 pin computer type plug and socket, if I can find someone who knows what these three circuits carry it mat be possible to use an outside transformer. I am told it is low voltage, either 12 or 25 volts, so I am trying to discover what voltage is carried to the two outside pins and positive perhaps and if the center pin is the negative common return, but that is just my idea of what they may be for.