Omtech SH-G1390 User Manual page 49

4.8.2 Cover Shutoff (Interlock)
Because of the risk of blindness, burns, and other injury from direct exposure to the invisible
engraving beam, this device also shuts off the laser automatically when the protective cover is
raised during operation.
After ensuring that the emergency stop button works, you should also test that the cover shutoff
works properly before conducting any other work on your machine. Start the water cooling system,
place a piece of laserable scrap material on the workbed, close the cover, and press Pulse to fire
the laser. Release the button. Taking care not to expose yourself to seeing or being hit by any
possible reflected laser light, open the cover as little as possible and attempt to fire the laser again.
If the laser fires, the automatic shutoff is not working and must be repaired before the engraver
can be used. Turn off the machine and contact customer service.
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