Laser marking machine can not mark the abnormal cause of light: not marking the cause of light: 1 software laser type setting error 2 light path 3 laser power supply is not electrified or damaged (4) the solution to the breakage of the control signal line or the loosening of the plug or the control card failure of the 5 laser: 1 the type of the laser is set as CO2 2 to adjust the optical path 3 has AC 220 V no DC 96V or 115V output laser power supply bad, No AC 220 V input inspection line, AC contactor with or without suction, intermediate relay with or without sucking, water tank running normally with 4 welding breakpoints, reinsert joint tightening fixed screws, Control signal fault replacement control card 5 replace lase