Many thanks for the suggestion of the 2K2 resistor across the two-pin input, my laser is now not hard on.
And thanks for the screen shot of the Technical Parameters (I didn’t get this with my unit)
My question now is; I have been trying to connect to the GT2560 board on a Geeetech i3 printer using the PWM fan output. Being cautious, and not having any technical info for the laser, I follows other advice and put a 8705 voltage regulator between the fan PWM out put and the 3-pin PWM input ( the 2-pin has the 2k2 resistor).
If it read the Technical Parameters correctly, I can feed the fan input (12v PWM) directly to the 3-pin PWM input? I don’t need the 8705 and although the laser is now working with it, I should get improved laser output?
Any and all help/ advice gratefully received.