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                         NEC 

Solutions 

(America), 

Inc.

 

    

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Visual Systems 

VT770 Installation Guide 

Desktop and Ceiling Mounted

   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

v1.2

 

 

Contents 

Product Description, Lens Specs 

www.necvisualsystems.com 

 

VT770 

Page 1 of 7 

Screen/Aspect 

Ratio, 

Notes 

and 

Formulas 

      Pg. 1 

Diagrams and Distance Charts;  4:3 Screens   

 

 

 

 

Pg. 2 

 

 

 

 

 

 

 

 

 

16:9 Screens   

 

 

 

 

Pg. 3 

Cabinet 

Dimensions; 

 

Top, 

Front 

and 

Right 

      Pg. 4 

      Bottom, 

Back 

and 

Left      Pg. 5 

Ceiling 

Mount 

Dimensions           Pg. 6 

Input 

Panel 

and 

Control 

Codes 

         Pg. 7 

 

Product Description                                                       

Type: 

  3 

panel 

LCD 

projector;        Brightness: 3000 

ANSI 

Lumens 

 

 

 

 

0.8” p-Si TFT w/MLA   

 

 

 

 

 

 

 

Dimensions:  13.4”(W) x 4.2”(H) x 10.2”(D) 

Resolution: 1024x768 

(4:3)          Weight:  7.9 

lbs 

 

 

 

 

1024x576 (16:9)   

 

 

 

 

 

 

 

 

 

 

Lens Specifications                                                          

Throw Ratio:  1.5 - 1.8:1 (for 100” diagonal)      Focal 

Length: 

24.0mm 

– 

28.8mm 

Offset Angle:  9.6

°

-11.5

° 

 

(

for 

100” 

diagonal)      F/#:   1.7 

– 

2.0 

Screen 

Sizes: 

25”-300” 

           Manual 

Zoom 

Manual 

Focus 

 

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                                                                     

ƒ

 

For screen sizes not indicated on the projection charts, use the formulas below. 

ƒ

 

If a value in a chart does not match the results of the formulas, use the values in the chart. 

ƒ

 

The ceiling must be strong enough to support the projector and the installation must be in accordance with any local 
building codes. 

ƒ

 

Distances are in inches, for millimeters multiply by 25.4. 

ƒ

 

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:

   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4:3 Screen Formulas:   

 

 

 

W

 

Image 

Width 

                 

W

 = H x 4/3   

 

 

 

 

 

 

H

 

Image 

Height 

(Size) 

               

H

 = W x 3/4   

 

 

 

 

 

 

B

 = Vertical distance between lens center and screen center   

 

 

 

 

Screen Diagonal

 = W x 5/4   

 

 

C

 = Throw distance   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 = Vertical distance between lens center and screen bottom  

 

 

 

 

 

 

(screen 

top 

for 

ceiling 

mounted 

application)         

16:9 Screen Formulas: 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W

 = H x 16/9   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 = W x 9/16   

 

 

 

 

 

 

Projection Formulas:                Screen 

Diagonal

 = W x 18.358/16   

B

 = 0.3W   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 (wide) = 1.4926W – 1.823  

 

 

 

 

 

Vertical Position for a 16:9 screen: The Vertical Position adjustment moves

 

C

 (tele)  = 1.8056W – 1.819   

 

 

 

 

 

the 16:9 image up and down in the unused portion of the 4:3 panel. This

 

D

(4:3) 

 

 

0.075W 

         

adjustment is only available when the projector is set for ‘16:9’ in the

 

D

(16:9) 

0.01875W 

        ‘

Screen’ menu. The range of Vertical Position is dependent on aspect ratio

 

α

 (wide) = tan

-1

 (B/C(wide))   

 

 

 

 

 

and 3D Reform used. If 3D Reform is not used, the approximate range of Vertical 

 

α

 (tele)   = tan

-1

 

(B/C(tele)) 

      P

osition is +/-0.167H (H=Screen Height) when using a 16:9 screen. 

 

Summary of Contents for VT770 Series

Page 1: ...atch 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 ...

Page 2: ...opular 4 3 screens B D Diag W H wide tele 4 3 wide tele inches inches inches inches inches 25 20 15 6 0 28 0 34 3 1 5 12 1 9 9 60 48 36 14 4 69 8 84 8 3 6 11 7 9 6 72 57 6 43 2 17 3 84 2 102 2 4 3 11 6 9 6 84 67 2 50 4 20 2 98 5 119 5 5 0 11 6 9 6 90 72 54 21 6 105 6 128 2 5 4 11 6 9 6 100 80 60 24 0 117 6 142 6 6 0 11 5 9 6 120 96 72 28 8 141 5 171 5 7 2 11 5 9 5 150 120 90 36 0 177 3 214 9 9 0 1...

Page 3: ... 3 1 7 11 5 9 5 110 96 54 28 8 141 5 171 5 1 8 11 5 9 5 119 104 58 5 31 2 153 4 186 0 2 0 11 5 9 5 123 107 60 32 1 157 9 191 4 2 0 11 5 9 5 133 116 65 34 8 171 3 207 6 2 2 11 5 9 5 135 118 66 35 4 174 3 211 2 2 2 11 5 9 5 159 139 78 41 7 205 6 249 2 2 6 11 5 9 5 161 140 79 42 0 207 1 251 0 2 6 11 5 9 5 Screen Size 16 9 C inches α degrees Vertical Position for a 16 9 screen The Vertical Position ad...

Page 4: ...Cabinet Dimensions The following drawings show the cabinet dimensions Dimensions are in inches For millimeters multiply by 25 4 2 69 foot 2 24 mount 1 62 www necvisualsystems com VT770 Page 4 of 7 ...

Page 5: ...are in inches For millimeters multiply by 25 4 4M 8 MAX for mount 4M 8 MAX for mount 4M 8 MAX for mount 13 39 4 40 mount 1 28 3 02 mount 6 99 mount 1 57 3 27 10 79 foot 1 97 foot 8 11 foot 7 05 foot 0 87 foot 0 67 5 59 mount 0 44 4 31 foot 3 86 mount www necvisualsystems com VT770 Page 5 of 7 ...

Page 6: ...ons Dimensions are in inches For millimeters multiply by 25 4 The VT65CM comes with a threaded pipe connector and a ceiling plate for flush mounting and minimal height pipe connector 4 33 6 19 10 74 1 5 NPT 0 40 DIA 3 45 10 74 5 00 3 00 ceiling plate 6 19 www Page 6 of 7 necvisualsystems com VT770 ...

Page 7: ...3H 10H 00H 00H 05H 18H 00H 00H 03H 00H 33H ASPECT RATIO 16 9 Screen 4 3 Window 03H 10H 00H 00H 05H 18H 00H 00H 00H 00H 30H Letterbox 03H 10H 00H 00H 05H 18H 00H 00H 01H 00H 31H Widescreen 03H 10H 00H 00H 05H 18H 00H 00H 02H 00H 32H 4 3 Fill 03H 10H 00H 00H 05H 18H 00H 00H 04H 00H 34H AUTO ADJUST 02H 0FH 00H 00H 02H 05H 00H 18H Note Contact your NEC rep for codes not listed Cable Connection Communi...

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