--- title: Checking Voltage of Power Supplies description: A guide for checking if voltages are nominal on the machines power supply units. --- [Skip to content](https://cptest.aplazer.com/en/knowledge/checking-power-supplies#main-content) English Show submenu for translations [Contact us](https://cptest.aplazer.com/en/knowledge/kb-tickets/new?hsLang=en) ![logo h white.png\]](https://cptest.aplazer.com/hs-fs/hubfs/Images/Logos/logo%20h%20white.png?height=40&name=logo%20h%20white.png) Open main navigation Close main navigation - English Show submenu for translations - [Contact us](https://cptest.aplazer.com/en/knowledge/kb-tickets/new) - Go to AP Lazer Go to AP Lazer Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://cptest.aplazer.com/en/knowledge?hsLang=en) 2. [CO2 Laser Documentation](https://cptest.aplazer.com/en/knowledge/co2-laser-documentation?hsLang=en) 3. [CO2 Laser -- Technical Documents](https://cptest.aplazer.com/en/knowledge/co2-laser-documentation?hsLang=en#co2-laser-technical-documents) # Checking Voltage of Power Supplies ## A guide for checking if voltages are nominal on the machines power supply units. When measuring the voltage of the power supply, make sure the multimeter is set to the proper setting. ![](https://cptest.aplazer.com/hs-fs/hubfs/image-png-Mar-24-2022-03-28-53-53-PM.png?width=363&name=image-png-Mar-24-2022-03-28-53-53-PM.png) To measure an AC output/input, make sure the dial is set to the first setting (1). If measuring for DC output or input, make sure the multimeter is set to the second setting (2).  The following are the power supply parts in the machine. 1 – JMDs 2 – 36V Power Supply **JMD Power Supply** For the several machine models, there are different JMD models to power different components within the machine. The models are: 1. JMD30-24; 24V 2. JMD20-12; 12V 3. JMD30-245; 24V and 5V 4. JMD30-2412; 24V and 12V JMDs 1, 2, and 3 are used in the bigger laser machines (2816 and larger). JMD 4 is used in the smaller laser machines (2616 and smaller). **2816 machines and up** The 2816 machines use the 3 JMD models to power different components within the machine. JMD30-24 is used to power the LED light switch and two separate LEDs. JMD20-12 powers the water pump of the machine. The JMD30-245 powers the red dot diode and switch, along side the temperature gauge and amp meter. **36V Power Supply 1812 – HW360-36** Input: 120V AC Output: 36V DC When measuring the DC output, make sure to measure for each of the different drivers to ensure each is outputting 36V. When measuring the AC input, make sure to measure ether between the live and ground wire or the live and neutral wire to check if it is inputting 120V. Measuring between the ground and neutral wire would read 0V since they are not connected. ![](https://cptest.aplazer.com/hs-fs/hubfs/image-png-Mar-24-2022-03-44-02-10-PM.png?width=431&name=image-png-Mar-24-2022-03-44-02-10-PM.png) **Laser Power Supply 2816+ -HY-ES100** Output: Varying Input: 120V The laser tube receives varying amounts of power based on the settings of the file to be cut. The voltage input of the machine should be 120V AC. Thus when measuring, make sure to measure once again between the black and white or black and green wires. Do not measure between white and green because the measured voltage will be 0V. ![](https://cptest.aplazer.com/hubfs/image-png-Mar-24-2022-03-44-21-14-PM.png) ![](https://cptest.aplazer.com/hs-fs/hubfs/image-png-Mar-24-2022-03-44-42-01-PM.png?width=518&name=image-png-Mar-24-2022-03-44-42-01-PM.png) - [Maintenance](https://cptest.aplazer.com/en/knowledge/maintenance?hsLang=en) - [Suggested Power and Speed Settings](https://cptest.aplazer.com/en/knowledge/suggested-power-and-speed-settings?hsLang=en) - [Rotary](https://cptest.aplazer.com/en/knowledge/rotary?hsLang=en) - [Laser Safety](https://cptest.aplazer.com/en/knowledge/laser-safety?hsLang=en) - [Materials and Laser Settings](https://cptest.aplazer.com/en/knowledge/materials-and-laser-settings?hsLang=en) - [Galvo Fiber Laser Documentation](https://cptest.aplazer.com/en/knowledge/galvo-fiber-laser-documentation?hsLang=en#main-content) - [Manufacturing Documentation](https://cptest.aplazer.com/en/knowledge/galvo-fiber-laser-documentation?hsLang=en#manufacturing-documentation) - [OEM Documentation](https://cptest.aplazer.com/en/knowledge/galvo-fiber-laser-documentation?hsLang=en#oem-documentation) - [Technical Documentation](https://cptest.aplazer.com/en/knowledge/galvo-fiber-laser-documentation?hsLang=en#technical-documentation) - [Machine Wiring Diagrams](https://cptest.aplazer.com/en/knowledge/galvo-fiber-laser-documentation?hsLang=en#machine-wiring-diagrams) - [CO2 Laser Documentation](https://cptest.aplazer.com/en/knowledge/co2-laser-documentation?hsLang=en#main-content) - [CO2 Laser -- Technical Documents](https://cptest.aplazer.com/en/knowledge/co2-laser-documentation?hsLang=en#co2-laser-technical-documents) - [CO2 Laser -- Laser Cut Documentation](https://cptest.aplazer.com/en/knowledge/co2-laser-documentation?hsLang=en#co2-laser-laser-cut-documentation) - [General -- Technical Documents](https://cptest.aplazer.com/en/knowledge/general-technical-documents?hsLang=en) [![Chill listening crop-3](https://cptest.aplazer.com/hs-fs/hubfs/Images/Logos/AP%20Lazer%20Logo.png?width=150&height=43&name=AP%20Lazer%20Logo.png "Chill listening crop-3")](https://aplazer.com) Copyright © AP Laser Copyright © 2026, AP Lazer