Ricoh PJ WU6181N 6200-Lumen WUXGA LCD Projector (No Lens) - Manual (Page 150)

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5. Using On-Screen Menu
Z-AXIS .............................. Display the projector image at an angle of −100 – +100
degrees to the vertical in the Z-axis direction.
Z-AXIS value of
the projector
Horizontal plane
Z-axis
Gravity direction