Question about NEC MultiSync MT830 Multimedia Projector

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Projector vertical running lines

I have an epson 821p mounted in ceiling a media center at my school. The projector is wired to the wall I have two computer lines going in vga mode, I have then the wire coming out to the ceiling and going into the projector. We have a company that comes out and installs them this way for are whole district.

I have other electronics running thru the ceiling, heating cooling, lights, infared sensors for alarm. I have tried several projectors and get the same results I have lines continually running thru the screen. Is something interferring? They are white lines, no color in them. The run vertical and scroll thru the whole screen. The sound seems to hum too. Any assistance would be greatly appreciated

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Hi there

This is definatelly a interference from a power cable. If any of your signal cables in the ceiling is closer that 5cm to one of those , you will get interference.

The Company that did the installation should know this and I would suggest you call them and tell them that they should sort it out. They should either move the cables or insulate them by means of conduit.

Posted on Apr 16, 2008

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IF I understand the problem from the limited info in your question, the problem is a distorted picture on whatever surface [probably a wall, or screen] onto which the image is projected.

With all lenses, the axis [centerline of the lens projected] MUST be absolutely PERPENDICULAR [in both the vertical and horizontal planes] to the perfectly plane [flat] surface onto which the image is projected.

IF for example, the projector is mounted in a rear corner of the room, and the camera is aimed downward and to one side to project the image on the center of the opposite wall, or a screen located there, the image will be distorted. It will be larger on one edge [fartherist from the lens] and smaller on the opposite [nearest] edge.

If it is non-perpendicular in only one axis, then two opposite edges will be different lengths, and if out of perpendicular in two axis then no edges will be the same length.

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