For Parts or Repair - Tried to test with batteries, no AC cord with unit. Unit would not power on. There is a small amount of blue corrosion on the negative terminals. This may or may not be the cause, but it seems light, so I don't think that is the issue here. It is assumed that even with a power supply, this will not power on, though we can't test that theory. This unit is sold as-is. Perhaps for repair, or as parts for another working one.