Problem/ Question: I can see there is this strange 4pin connector on both Cohesion3D board and laser power supply. For now, its connected with only two cables to the m2 nano as seen on pictures. Where do i get this 4 pin power connection cable? Can i buy it somewhere?
The wires in the 2 pin cable (TL / LO and Gnd) located at the top right will need to be connected to the screw terminals on the C3D, which are the Laser Fire and Laser Gnd respectively. You can ignore the 24V and GND 4 pin connector since LaserBoard has its own power supply for the board.
This page covering the 6 Pin Laser Power Connector will show where to connect them at the bottom of the link.
If you need additional guidance, I have upgraded your user level to allow you to post more photos. Please trace the wires back to the laser power supply and provide additional images of your machine and wiring.
Correct, you will not need to connect the large power plug to the C3D board. Just connect the 2 wires at the top right to the board to screw terminals on the LaserBoard to the respective laser fire and ground. All else appears standard.