sorry to bump such an old thread...but for anyone looking in 2019 (such as i am doing), the picture given in this thread accidently blocks the red slide switch that chooses if you're running 110 volt US power or 220 volt european power into the computer.
attached picture of where that red slide switch is located on a typical power supply, within the computer metal box that is found in the backbox of a Pin2K machine.
pin2k power (resized).jpg