Nortel Networks 83c User Manual

If the projector is tilted up or down, the images that are displayed will 
be distorted. To correct the distortion or “keystone” shape, do one or 
more of the following:

■

If your image looks like 

 or 

, you’ve placed the projector 

off to one side of the screen, at an angle. Move it directly in front 
of the center of the screen, facing the screen squarely.

■

If your image looks like 

 or 

, you need to adjust the 

keystone correction value. Press the 

 or 

 buttons on the 

projector to correct the shape of the image. After correction, your 
image will be slightly smaller.

■

You may need to turn on Auto Keystone. See page 56 for 
instructions.

You can also make keystone adjustments using the projector’s Settings 
menu. See page 56.

The brightness of an image depends on the source you are projecting 
and the amount of light in the room. If the image is too bright or not 
bright enough, here are two ways you can adjust it:

■

Change the 

Brightness

■

Select 

Low

 or 

High

 for the 

Brightness Control

 option in the 

Settings menu. (See page 57.) Low brightness mode extends the 
life of the lamp and decreases the fan noise.