The diodes are in the smaller module on the back of the board that's bolted to the big heatsink. The larger module is an IGBT six-pack. The parts that look like transformers are probably a line reactor or big inductors for filtering.
@@spacehitchhiker4264 yea you're right. I forget that the ABB has built in line reactors. I wish I could get me hands on a schematic for them just to see how everything works and what parts are what.
@@huasohvac you dont need it , you don't need to know how things work you need to test parts , and to test parts you will need Oscilloscope to test the Signal sent to Transistors , you need good disordering iron to test various parts outside , and of course to test them you need a power supply . Go over everything and it shell work . Once done do not hook it up directly , hook it up in series with the light bulb . But even without having touched it i can see what is wrong , Transistors shorted , remained open circuit and then its just a matter which part burnt first , it may be a couple of them . So a power supply , multimeter . oscilloscope for testing signal , and light bulb .
