Omtech USB475a User Manual page 23

Water Shutoff
Because of the danger posed by an uncooled laser tube, this engraver also shuts off the laser automatically when the
water cooling system malfunctions.
After ensuring that the emergency stop button and cover protection both work, you should also test that the water 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. Cut off
the flow of water by crimping or tying the two hoses. (Take care not to damage the hoses themselves in this procedure.)
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. If the laser does not fire, the automatic shutoff
is working fine; simply release the two hoses to begin circulating water again and continue setting up your engraver.
Laser Path Calibration
Although our factory calibrates your entire system during assembly, it is possible for the laser tube, the focus lens,
and/or one or more of the mirrors to be jostled out of alignment during shipment. As such, it is recommended that you
perform an optical alignment test as part of setting up your machine. See the Maintenance section below for step-by-step
guidance.
Air Assist
Your air assist should arrive pre-installed and correctly wired. Simply check that it is correctly configured and connected
as shown. If any tubing or wiring needs to be reconnected, shut off all power to the machine (including by pressing the
emergency stop) before adjusting anything. Check that its air intake filter is in place, clean, and not obstructed by any
nearby objects
3.10 Security
For your own safety and that of passersby, this engraver can be locked shut using the provided key. It is recommended
that you use it to lock the machine between sessions, preventing any unauthorised operation of the machine.
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