Common fault diagnosis methods (laser cutting machine 2)

Can't a mouthpiece, a laser light? Speckle pattern is not round, the moon switch, dentate? 1, first of all, open the lid, press the light button to see the laser tube hair does not shine, such as light, the light path. Correction. 2, adjust the light path, cellophane tape with speckle pattern is not round, the moon shape, dentate, please clean the mirror, focus lens. If not. 3, check, reflectors, focus lens is spent or membrane. The inner situation, to replace the above parts.