This manual describes the features and characteristics of the 28A8755B projector, including the projector's functions, preparations, part names, setting up the projector, connecting devices, using the remote control, turning on the power, turning off the power, adjusting the volume, temporarily muting the sound, adjusting the position, using the automatic adjustment function, correcting keystone distortion, using the magnification function, freezing the screen, signal search, selecting the aspect ratio, temporarily blanking the screen, using the menu functions, operating the PC screen, the lamp, the air filter, and other maintenance