NEC LT154 Installation Instruction

Page of 8
                                                           
 
         
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
       Visual Systems 
LT154/155/156 Installation Data 
Desktop and Ceiling Mount
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Rev. 1.8 
                                                                    Page 1 
 
Contents 
Product Description, Lens Specs, Notes and Formulas   
 
Page 1 
Projection Distances and Screen Sizes 
 
 
 
Ceiling Mount Installation 
 
 
 
 
 
 
 
Page 2 
Desktop Setup 
 
 
 
 
 
 
 
 
 
 
Page 3 
Cabinet Dimensions 
   Top, 
Front 
and 
Left 
Side 
        Page 4 
   Bottom, 
Back 
and 
Right 
Side       Page 5 
Ceiling Mount Dimensions 
     Top, 
Front 
and 
Left 
Side 
      Page 6 
     Bottom, 
Back 
and 
Right 
Side     Page 7 
PC Control Codes 
 
 
 
 
 
 
 
 
 
 
 
 
Page 8 
 
Product 
Description                              
Type:   
 
LT154: 3 panel, 0.9” p-Si non-MLA LCD projector   
 
 
 
 
Native Resolution: 
 
1024 x 768 
    LT155: 
panel, 
0.9” 
p-Si 
w/MLA 
LCD 
projector      Dimensions: 
8.2”(W) 
11.1”(D) 
2.8”(H) 
 
 
 
 
LT156: 3 panel, 0.9” p-Si w/MLA LCD projector, w/DVI Input   
 
Weight:   
4.9 lbs 
Brightness:         LT154:   900 ANSI Lumens 
    LT155/156: 
1200 
ANSI 
Lumens 
 
Lens Specifications                                                           
Throw 
Ratio: 
   1.9-2.0:1(Wide) 
2.2-2.3:1(Tele)  Focal 
Length: 
  36.5 
– 
42mm 
Offset 
Angle: 
   9.0° 
(Wide) 
7.5° 
(Tele) 
    F/#:     2.0 
– 
2.3 
Screen Sizes:  
 
 
25” – 300” Diagonal   
 
 
 
 
Focus Adjustment:  Manual Focus / Manual Zoom 
 
Notes                                                                     
 
For Screen Sizes of 25 to 300 inches not indicated on the projection tables, use the formulas below. 
 
If the figures on the tables do not match the results of formulas, use the figures in the table. 
 
The ceiling must be strong enough to support the LCD projector and the installation must be in accordance with any local 
building codes. 
•  All calculations are based on 4:3 aspect ratio. 
•  Distances are in inches, for millimeters multiply by 25.4. 
•  Distances may vary ±5%. 
 
Formulas                                                                   
Units: Inches (for millimeters multiply final number by 25.4) 
 
= Screen Diagonal (4:3) 
H = D x 0.8   
 
 
 
 
 
 
 
 
H = Screen Width (4:3) 
V = D x 0.6 
 
 
 
 
 
 
 
 
 
V = Screen Height (4:3) 
 
M 
1.38889H 
         = Projection magnification 
B = 0.2165M   
 
 
 
 
 
 
 
 
B = Vertical distance between lens center and screen center 
C (Wide) = 1.4483M – 2.165  
 
 
 
 
C = Throw distance 
C (Tele)  = C (Wide) x 1.15 
D = 0.0535M   
 
 
 
 
 
 
 
 
D = Vertical distance between lens center and top of screen (bottom of screen 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
for desktop application) 
α
αα
α (wide) = tan
-1
 
(B/C(wide)) 
     
α
αα
α = Throw angle 
α
αα
α (tele)   = tan
-1
 (B/C(tele))