Adjust the emitter module:
Open the emitter module’s top cover; there are two gears (Gear A, Gear B)
and the red light power button. Press the red light power button, a horizontal
beam of red light will indicate whether the laser beam is parallel.
Gear A: used to adjust the vertical direction of the beam of red light (which is in
the same direction of the laser beam). Turn Gear A clockwise, the beam of red
light will move away from projection board. Turn Gear A counter-clockwise, it
will approach the projection board.
Gear B: used to adjust the horizontal direction of the beam of red light (which is
in the same direction of the laser beam). Turn Gear B clockwise, the right part
of the red light beam will move away from the projection board and that of the
left part will approach the projection board. Turn Gear B counter-clockwise, it
will approach the projection board.
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