I have a Nord 6D which i am trying to repair. I can’t locate a service manual to troubleshoot whether the poower supply or mainboard are faulty. The schematic will allow me to check voltages. There is no power getting to the panel, although the power supply shows voltages of -12, +12 and 5 getting to the main board, but the unit won’t power up. Can anyone help me here? I could order the parts, but they are non returnable and I would like to pinpoint which part is bad…PLEASE HELP!