# Power supply detection instructions

**URL:** https://forum.cloudray.com/t/power-supply-detection-instructions/231
**Category:** Laser Power Supply
**Created:** [April 9, 2021, 9:37am UTC](https://forum.cloudray.com/t/power-supply-detection-instructions/231 "2021-04-09T09:37:05Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Technician](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.cloudray.com/technician/32/15_2.png) [@Technician](https://forum.cloudray.com/u/Technician)
#### Post date: [April 9, 2021, 9:37am UTC](https://forum.cloudray.com/t/power-supply-detection-instructions/231/1 "2021-04-09T09:37:05Z")

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When the power supply is in standbymode, press the test switch, the L light is on, and the P light is on.  
If the laser light is on and the lasertube does not emit laser light, the laser tube is broken;  
If the laser tube outputs laser, thelaser power supply is normal;  
If the LASER lamp is off, the laserpower supply is broken.

 ![image](https://us1.discourse-cdn.com/flex020/uploads/cloudray/original/1X/1b3ae837f00d82dbf54b4b956fc9ce14cd442601.jpeg)