Remove these 4 silver 6mm Philips #2 screws to release the top power supply.

Peel off this cardboard that is glued to the power supply cover.

Unplug the large plugs at each end of the power supply and move the power supply out of the way. You can leave the smaller fan wire connected.

Remove these 4 silver 8mm Philips #2 screws from the lower power supply then move the power unit to the side, along with the card it is resting on.

You now have clear access to the DMD heatsink.