No Power form the 15W Laser

I just received my Machine, and there is no full power from the laser. The newest update didn’t change. Light burn or lasergrbl didn’t show other results. I can’t burn even paper with it . I looked for the connectors and wonder what is the difference between key pwm and the other pwm. But the change didn’t helped at all.
But there is a position on the laser pcb where on other laser is sitting a switch !? On your laser the position is empty.
Please help me

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