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1、check the light inside the laser tube shallow, such as the glow discharge line pale, the output no output, indicating the working gas decomposition, weakness；

2、check the power current is within the normal range, and the appropriate size of the power to adjust whether the current can change, excluding laser power；

3、check the water cooling system (water temperature, water flow), the water temperature should not exceed 25 degrees Celsius, the water pipe is blocked；

4、 check the output lens, reflector lens or focusing lens is polluted, the optical path adjustment is correct; Dimming is easy to pollute the lens, with 99.7% anhydrous alcohol can be wiped。