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Open the door and check the location of the dot.
This dot shot from the top-left corner is the reference
point when adjusting the mirror. The shot made from
other locations should be adjusted to move toward
the reference point.
Move the laser head to the bottom-left corner.
Close the door and press "Laser Pulse".
Open the door and check if the second beam is
overlapping with the first one. If not, adjust the screws
behind the first mirror.