If you have a multimeter, you can simply test the use Resistance or Continuity to test the fuses. And like the 128 - Plus, you can use the floppy port of the IICX to check the power supply voltages.

But first while you have it in "Project" Status, you can get the motherboard recapped. Also get the video card recapped, though it is only 4 caps on the video card.