Epson 821p 사용자 설명서

Epson PowerLite 821p Projector

9/04

Epson PowerLite 821p Projector 

- 

3

Before connecting the projector, you need to decide where to 
place it. The location you choose depends on the size of the 
room and what you are projecting.
❏ Place the projector on a sturdy, level surface, between 

2.8 and 48.3 feet from the screen.

❏ Make sure there is plenty of space for ventilation around and 

under the projector. Leave at least 8 inches between the 
projector and a wall.

❏ Make sure the projector is within 6 feet of an electrical outlet 

or extension cord and within 5 feet of your computer and/or 
video source. 

❏ Place the projector directly in front of the center of the 

screen, facing the screen squarely. Otherwise, your image 
will not be rectangular.

Use the figure below as a guideline to help you determine how 
far from the screen to place the projector. Image size generally 
increases with distance, but may vary depending on how you 
position the zoom ring and whether you have adjusted the 
image size with other settings. 

To calculate measurements, use the following formulas:
❏ To find the projection distance when you know the screen’s 

diagonal dimension:

Wide (inches) = ((Diagonal screen size [inches] 

×

 2.97334) –

2.3937) / 2.54
Tele (inches) = ((Diagonal screen size [inches] 

×

 3.61474) – 

2.06831) / 2.54

❏ To find how large a screen’s diagonal dimension will be 

when you know the projection distance:

Wide (inches) = (Projection distance [inches] 

×

 0.32827 

×

 

2.54) + 1.6767
Tele (inches) = (Projection distance [inches] 

×

 0.203 

×

 2.54) 

+ 1.077

If you place the projector below the level of the screen, you’ll 
have to tilt it up by extending the front adjustable foot, as 
shown. Tilting the projector upward causes the image to lose its 
rectangular shape, but the Auto Keystone feature corrects the 
distortion automatically. If the image does not regain its 
rectangular shape, the Auto Keystone feature may have been 
disabled. To turn it on, see page 6.

If you place the projector level with the bottom of the screen, 
the image will be rectangular and you won’t have to adjust it. If 
you place the projector higher than the bottom of the screen, 
the image will still be rectangular, but you won’t be able to fill 
the whole screen with the image. 

Make sure your projector and other equipment are connected 
correctly. Then turn on your projector, as described below. 

If you turn on your computer or video equipment before 
starting the projector, the projector automatically detects and 
displays the image source. If you turn on the projector first or 
have multiple pieces of equipment connected, you may have to 
select the source manually. See page 5.

1. Remove the lens cap.

2. Connect one end of the power cord to the projector’s power 

inlet. Then connect the other end to an electrical outlet. 

29.8 to 48.3 feet

5.8 to 9.5 feet 2.8 to 4.7 feet