NEC NP3150 User Manual page 146

Install the new lens
1. Insert the lens with the yellow protrusion on top.
2. Rotate the lens clockwise.
R
Using the anti-theft screw to prevent theft of the lens
Tighten the supplied anti-theft screw on the front bottom.
T H E T R U S T E D S O U R C E F O R P R O J E C T O R L A M P S A N D A C C E S S O R I E S
Hole of anti-theft screw for lens unit
131
8. Using Optional Lenses
Yellow
Protrusion