Diagnostic of laser system malfunction.

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Diagnostic of laser system malfunction.

Post by TOLY » Thu Nov 01, 2018 4:11 pm

My K40 laser machine (60W upgraded to 80W) control panel suddenly darkened. Have replaced controller it with a new control system (from buildyourcnc.com).
Setup with PC was successful, but laser does not work.
In order to determine the reason, I have connected TTL input to laser power supply to the GND for hand switching the power supply. Laser still is dead.
Then I tried to measure PWM (pulls width modulation) output from controller to “catch” the voltage change from 0 to 5 VDC at the moment when laser suppose to burn while cutting the material. But the voltage was constantly about 5 VDC.

I still have no idea what is the reason of the problem: the laser power supply is bad (BTW, fuse is not burned), or controller is bad, or setup is wrong. Can anybody explain me what is going?

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