Projection Devices, ContinuedVideoprojectorsNomenclatureUseMonitorsNomenclatureUseVideo projectors are very similar to VCR units. The major difference is thatthe video projector projects the image onto a screen. The video projector isprimarily a teaching device meant for small audiences. One of the drawbacksin using this projector is how easily it slips out of adjustment.Video projectors have the same buttons and switches as a VCR with only afew differences. These differences are a projection lens, a focusing ring, andinput/output ports to the video cassette player.Position a video projector so that it is not in a traffic area as this projectoreasily jars out of alignment. Use a special projection cart, or ideally, mountthe projector to the ceiling in a projector rack. The projector has sensitiveadjustment dials. A misadjusted projector will project an image that appearsto have a ghost or has incorrect coloration. Adjust this projector beforeactual use by aligning the three primary color dots on the screen until onlywhite light is seen.Monitors are television screens connected to computers or video cassetterecorders/players to playback audiovisual tapes. Monitors have the sameadjustment features as a television. Use as large a monitor as practicable inthe classroom or theater.Monitors have an input port, an output port, an on/off switch, a screen face,a color balance control, and a vertical/horizontal hold adjustment dial.Never force a plug into an input/output port. Monitors are hardy devices thatrequire little care beyond general maintenance and commonsense treatment.5-18
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