NEC VT770 Installation Manual

VT770 Installation Guide
Desktop and Ceiling Mounted
Contents
Product Description, Lens Specs
Screen/Aspect Ratio, Notes and Formulas
Diagrams and Distance Charts; 4:3 Screens
Cabinet Dimensions; Top, Front and Right
Bottom, Back and Left
Ceiling Mount Dimensions
Input Panel and Control Codes

Product Description

Type: 3 panel LCD projector;
0.8" p-Si TFT w/MLA
Resolution: 1024x768 (4:3)
1024x576 (16:9)

Lens Specifications

Throw Ratio: 1.5 - 1.8:1 (for 100" diagonal)
Offset Angle: 9.6°-11.5° (for 100" diagonal)
Screen Sizes: 25"-300"
Screen Type/Aspect Ratio Control
Both 16:9 and 4:3 screens are fully supported with proper aspect ratio control for both type sources using NEC developed
scaling technology. By selecting the screen type in the menus, Aspect Ratio control is reconfigured for that screen type.
•
For a 4:3 screen; select "4:3" in the "Screen" menu for proper aspect ratio control of 4:3 and 16:9 sources.
•
For a 16:9 screen; select "16:9" in the "Screen" menu for proper aspect ratio control of 4:3 and 16:9 sources.
*Factory default "Screen" setting is "4:3".
Notes
For screen sizes not indicated on the projection charts, use the formulas below.
If a value in a chart does not match the results of the formulas, use the values in the chart.
The ceiling must be strong enough to support the projector and the installation must be in accordance with any local
building codes.
Distances are in inches, for millimeters multiply by 25.4.
Distances may vary ±5%.
Formulas
The Projection Formulas use the image width for calculation. Image width is the same for all aspect ratios, only vertical image size
varies. For proper projector placement, determine the image width for a desired screen size. Use the Screen Formulas below to
calculate all screen dimensions. Plug in the image width for "W" in the Projection Formulas.
Refer to the diagrams and charts for popular screen sizes on page 2 and 3.
Definitions:
W = Image Width
H = Image Height (Size)
B = Vertical distance between lens center and screen center
C = Throw distance
D = Vertical distance between lens center and screen bottom
(screen top for ceiling mounted application)
Projection Formulas:
B = 0.3W
C (wide) = 1.4926W – 1.823
C (tele) = 1.8056W – 1.819
D(4:3) = 0.075W
D(16:9) = 0.01875W
α (wide) = tan -1
(B/C(wide))
α (tele) = tan -1
(B/C(tele))
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16:9 Screens
Vertical Position for a 16:9 screen: The Vertical Position adjustment moves
the 16:9 image up and down in the unused portion of the 4:3 panel. This
adjustment is only available when the projector is set for '16:9' in the
'Screen' menu. The range of Vertical Position is dependent on aspect ratio
and 3D Reform used. If 3D Reform is not used, the approximate range of Vertical
Position is +/-0.167H (H=Screen Height) when using a 16:9 screen.
NEC Solutions (America), Inc.
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Brightness: 3000 ANSI Lumens
Dimensions: 13.4"(W) x 4.2"(H) x 10.2"(D)
Weight: 7.9 lbs
Focal Length: 24.0mm – 28.8mm
F/#: 1.7 – 2.0
Manual Zoom / Manual Focus
4:3 Screen Formulas:
W = H x 4/3
H = W x 3/4
Screen Diagonal = W x 5/4
16:9 Screen Formulas:
W = H x 16/9
H = W x 9/16
Screen Diagonal = W x 18.358/16
Visual Systems
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