NEC NC1600C - Adjustments During Prism Assy Replacement; Optical Adjustments (Fold Mirror)

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15-1
ADJUSTMENTS DURING PRISM ASSY REPLACEMENT
Adjustments during Prism Assy Replacement (Optical)
A. Optical adjustments (Fold mirror adjustments)
If any shadow appears in the display area at the time of prism Assy replacement, adjust the angle of the fold
mirror at the optical engine block and arrange the balance in a good order between the illumination area and
the display area so that vertical and horizontal symmetry can be secured.
1) Display “white” of the test pattern.
2) Adjust the focus.
3) Mount the fold mirror, turn the screws (in 3 positions), and make adjustments to obtain an all-white screen
where no missing (shadow) is seen in the peripheries of the projected images.
Fold mirror, enlarged
Fold mirror mounting screws
Image Area
Illumination Area
Missing (shadow) in peripheries of images
Shadow adjustments OK
Shadow adjustments NG
Left side of the projector
1
2
3
AB