Hello — I have a Genmitsu PROVerXL 4030 with a LaserTree module.

Community Laser Talk
1

Hello — I have a Genmitsu PROVerXL 4030 with a LaserTree module.
When I power on the machine, the laser output gives a fixed voltage of about 5 V (the laser stays on or doesn’t respond to PWM changes).

I’ve already tried:

  • Checking the wiring (3-pin cable),
  • Sending commands M3 S255 / M3 S0,
  • Checking the SainSmart documentation (the “disable PWM” switch is set to OFF).

Symptoms: The PWM voltage does not change when I send S0 → S255 (it always stays around 5 V).
What I measured: (please see multimeter readings, GRBL version, exact wiring, connector photo if needed).

Has anyone experienced this before?
Any ideas — wrong cable, converter/inverter between the board and the laser, dead PWM pin, or GRBL parameter to check?
Thanks :folded_hands:

2

In GRBL with the laser option enabled, M4 is used to represent variable power. M3 is assigned as fixed power, which is usually the maximum.

What dialect of GRBL did you choose when initially setting up the Device Type?