First, make sure you are booting up the laser marker following the right procedures:

1. Connect the power cable to your machine, and then to a 3-prong socket, which must have a working ground wire. 
2. Ground the machine using the ground wire on its back.
3. Flip the rocker switch on the back of the machine. The indicator light should light up and stay on. 
4. Turn the emergency stop clockwise to release it. You should be hearing the fan blowing inside the control unit.
5. Turn the power key switch in the right direction. You should be hearing a buzzing sound from the Galvo head.
6. Press the green button. You should see the button glow green and hear a louder noise coming from the control unit, indicating the laser source has successfully booted up. 

If you have followed the correct procedures and the machine remains inactive, use the three scenarios below to troubleshoot. 

Scenario 1: No fan-blowing sound can be heard from the control unit with the emergency stop released.  

The problem might be with any of the following:

• • Main power cable
  • Wall socket 
  • EMI  filter 
  • Emergency stop 
  • 5V power  supply

1. Remove the cover of the control box.
2. Check the input voltage of the 5V power supply. If you are getting a reading and the indicator light on the power supply is not lit, replace the 5V power supply with a new, identical one.

   3. If you are getting no reading, check the input and output voltage of the EMI filter.

• If you are getting an input reading and no output reading, replace the EMI filter with a new, identical one. 
• If you are getting an input reading and an output reading, replace the emergency stop with a new, identical one.
• If no input reading can be read, check whether the wall socket that the machine is connected to has power.

Scenario 2: The Galvo lens remains silent with the power key switch turned. 

If you have turned the power key switch and the Galvo head is not making any sound, the problem might be with any of the following:

• 15V Galvo head power supply
• Power key switch 
• Galvo head 

Use the steps below to find out which is causing the problem.

1. Remove the panel on the control unit.
2. Measure the input and output of the 15V power supply (as shown).

• If the reading is normal and the indicator light on the 15V power supply is not lit, replace this faulty power supply.
• If you are not getting a reading from the power input of the 15V power supply, then replace the power key switch.
• If the input and output of the 15V power supply are normal and the Galvo lens is still not energized.

1. Remove the theta lens from the Galvo head.
2. Stick your index finger into the housing of the Galvo head.
3. Feel whether the internal lenses are locked tight in place.

• If they feel loose, replace the Galvo head with a new, identical one. 
• If they feel tight, the Galvo head is normal.

Scenario 3: The button won't light up after being pressed. 

      Replace the button with a new, identical one, if this is the case.

Scenario 4: No sound of a blowing fan can be heard with the button pressed. 

If you have pressed the power button and the laser source is not making any sound, the problem might be with any of the following:

• 24V/48V laser source power supply
• Power button
• laser source 

Use the steps below to find out which is causing the problem.

1. Remove the panel on the control unit.
2. Measure the input and output of the 24V/48V power supply (as shown).

• • If the reading is normal and the indicator light on the 24V/48V power supply is not lit, replace this faulty power supply.
  • If you are not getting a reading from the power input of the 24V/48V power supply, replace the power button.
  • If the input and output of the 24V/48V power supply are normal and the laser source is still not energized, replace the laser source.