1. Wipe: Wet the dust-free cloth with alcohol (cover the alcohol bottle cap in time, so as not to be accidentally knocked over), gently wipe the window around the laser cutting head protective mirror with a dust-free cloth, the purpose of this process is to avoid dust entering the chamber during the removal process.

2. Unloading: First seal the copper mouth with the paper, gently pull out the protective lens drawer, and use the paper to seal the cavity to prevent dust from entering. Turn counterclockwise to remove the protective lens, then place the lens on a dust-free cloth.

3. Clean: use a dust-free cotton swab to gently wipe the inside of the protective lens drawer and around the insert to clean it and avoid dust entering.

4. Replace: Take out the new protective lens, tear off the protective paper on one side, then gently cover the protective lens insert, turn over, and then tear off the protective paper on the other side of the lens, load the tablet and lock it.

5. Installation: tear off the paper, gently insert the protective lens insert into the cavity, the hexagonal screw lock.