Laser wont fire no test button on power source

[a77an]

Hi i bought this power source hire a few years ago: 40W~60W PWM CO2 Laser Power Supply (AC 220V)
now i am having a problem, my laser is not firing, and when i chech the power source it doesnt have test button so i can not determinate if the problem is the power source or the laser tube. thanks

[mrsunnylam]

It is possible the water protection switch is bad. if that switch is bad then the laser power supply(LSPU) will not activate.
if you have a digital multi meter (DMM) check for continuity by putting a prob on each side then turn on the water chiller. if it beeps then the switch is good. or it can be a bad switch on your cover that can prevent the machine to work.