1. Whether the laser resonator changes; Fine tune the resonator lens. Make the output light spot best;
2. The acoustooptic crystal is offset or the output energy of acoustooptic power supply is low; Adjust the position of acoustooptic crystal or increase the working current of acoustooptic power supply;
3. The laser entering the galvanometer deviates from the center: adjust the laser;
4. If the current is adjusted to about 20a and the sensitivity is still not strong enough: the krypton lamp is aging, replace it with a new lamp.