Laser Troubleshooting

The laser does not emit light

• Firmware Settings - $30, 31 or $730 $731
• Make sure it is set to SLB_Laser and in Laser Mode
  • You can only change the dropdown in the opposite mode.
• Check voltage output like in Chris’s video https://resources.sienci.com/view/slb-manual/#slb-control
• Engraving power on LightBurn (Power Max) - make sure it matches firmware
• Power supply - should read 24V and 4A
• Connections secured and in the right position - PWM, power cable
• Check PWM red light on SLB (see photo)
  • If red light is OFF try to change the default spindle to laser and the spindle 1 to SLB_spindle
    • Go to Config then search "default spindle" in the top of the screen. Select SLB_laser. Press Apply Settings
    • Then search "spindle 1"  and select SLB_spindle. Press Apply Settings
    • Turn OFF and ON your SLB to make the settings take effect
    • Then go back on gSender. Toggle to Spindle. Then use the dropdown under Spindle/Laser, select SLB_laser. Toggle back to Laser. Let us know if that allows you to turn on the laser.
  • If red light is ON and the laser is still not working, prob a circuit issue
    
• Reflash SLB firmware especially if on old version

The laser always emits light

• PWM output - refer to video to check PWM voltage output
• Could try inverting PWM laser signals $743

Lines across the entire burn

• Feeds and speeds (controller and LightBurn)
• $32 Laser mode not properly set on gSender
  • Ensure in Laser mode the dropdown is SLB_Laser
• PWM connection

Laser performance has degraded

• $30, 31, 32
• Feeds and speeds (controller and LightBurn)
• Dirty lens - clean with alcohol cotton swab/Q-tip and use air assist when engraving
• Power supply - should read 24V and 4A
• Temperature of laser diode - too hot need to check cooling fan
• Connections secured
• Glue between layers (like plywood) will not efficiently cut
• Degrading diode over time, should not run at 100% power all the time

Darker edges on engravings

• Faster accelerations needed