- Changed pwm spindle speed for jtech laser from 255 to 1000. Since spindle speed is increased, you will most likely need to increase the S value (m3 sXXX) you have been using in the mdi command to fire the laser. This S value should be anywhere from 1-100 (100=10% power). If using lightburn, you’ll must to do this for the laser to work correctly : S Value for Lightburn with Jtech Laser
via the update faq. 40 might not be high enough as it was 15.6% and is now only 4%.