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Place the laser tube into the chassis. Make sure
the gap is wider than a finger on both ends of the
tube. The terminal on the laser tube which connected
to the thick red wire should point upward. Install the
screws of the tube holder clip and make sure the tube
is fastened firmly.
Make sure the terminal of the red cable points
upward instead of other angles. Do not let the end of
the tube touch or near the side of the chassis. Wrong
placement for the tube may cause voltage leak.