---
title: Replacing the Power Converter in a Razor CO2 Laser
description: Guide to replace the power converter (Transformer) in a CO2 laser. Includes identifying issues, tools needed, and step-by-step replacement process.
---

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# Replacing the Power Converter in a Razor CO2 Laser

## Step-by-Step Guide to Safely Replace the Power Converter in Your Razor CO2 Laser

This guide explains how to replace the power converter (Transformer) in a CO2 laser, a common fix for various issues such as bad engraving or stuttering of the Gantry head.

**Identifying the Problem**

1. **Symptoms of a Bad Transformer** 
     - Bad engraving quality.
     - Stuttering or inconsistent movement of the Gantry head.
     - Failure in different areas of the laser due to inconsistent power supply.

**Tools Needed**

- Wire cutters
- Wire strippers
- Screwdriver

**Replacement Process**

1. **Unplug the Machine**
   
     - Ensure the machine is unplugged for safety.
2. **Loosen Screws**
   
     - Loosen the four screws holding the Transformer in place.
3. **Cut Zip Ties**
   
     - Cut zip ties to free the wires connected to the Transformer.
4. **Disconnect Wires**
   
     - Identify and disconnect the wires: 
           - **Incoming Power:** Blue and black wires (red wire is taped off and not used).
           - **Outgoing Power:** Green (37 volts) and yellow (21 volts) wires.
5. **Strip Wires**
   
     - Strip about 1/8 inch off the end of each wire.
6. **Connect New Transformer**
   
     - Match and twist the wires together: 
           - **Black wires to black wire.**
           - **Red wires to blue wire.**
           - **Green wires to orange wires (37 volts).**
           - **Yellow wires to purple wires (21 volts).**
7. **Crimp Connections**
   
     - Use butt connectors to crimp each connection securely.
8. **Reinstall Transformer**
   
     - Screw the Transformer back into place and secure wires with new zip ties.
9. **Test the Machine**
   
     - Plug in the machine and test to ensure it works correctly.

**Conclusion**

Replacing the Transformer in your CO2 laser can resolve various power-related issues. Following this guide ensures a proper and safe replacement process. For further assistance, refer to Lightburn documentation or support channels. Happy engraving!

- [Lightburn](https://support.salasers.com/lightburn?hsLang=en#main-content)

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