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This is an air filter that filters dust and other things from going into the fan and projector. The air goes through the filter, then the
inside spins and filters the air.

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The projector fan is controlled by the mainboard and cools various parts of the projector. It mainly cools the bulb and protects the projector from overheating.

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The mainboard of a projector is a computer board made of chips and electronics for controlling parts of the projector. The mainboard controls the fans that cool the bulb, drives the image engine and allows the user to control the projector externally.

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The lenses used in projectors are convex lenses. Convex lenses are curved outwards with a magnifier that is also curved. The video the projector is projecting, is upside down and the curved lens makes it inverted so it is right side up when we see it.

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The lamp or projector bulb illuminates a LCD panel that projects an image. The LCD panel is a liquid crystal display that reflects light to create an image in color. The lamp produces a very bright light because an electric current is used to light the mercury vapor inside and produces a very bright light.

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The projector in it's original box.

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We have a 13 year old Hitachi CP-X265 LCD Projector.  The MSRP (original price) for the projector was $2,995 and the projector is not being produced anymore. The projector is 7.2 pounds and the lamp life is 2,000 hours.

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This and the next few pictures are pictures of the projector that we will take apart. It is kinda bulky and seems old. It has never been taken apart before and it is a Hitachi projector. This is the front side.

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Back side

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Side view

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Other side view

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The top of the projector

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The bottom of the projector

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We have done nothing so far

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When one of these metal levers switch, the circuit is opened and electricity stops flowing through the circuit.

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I chose this topic because I didn't really know what circuit breakers were. I have heard about them before but I didn't know what exactly they did and how they work. There are many different types of circuit protection, protecting your house from burning down. One of the simplest ones is the fuse. Fuses are simply a thin wire covered with a case. The wire is plugged into the circuit and disintegrates when it heats up above a certain level. This opens the circuit up and stops excess current from damaging other wires. The downside of this is that you need to get a new fuse if the old one is used up. A basic circuit breaker is a little more complex than a fuse and can be used more than once. Circuit breakers are simply a switch that opens a circuit when the current goes above safe levels. Basic circuit breakers have an electromagnet that pulls down a lever and shuts off the electricity when the current goes above safe levels. Some more advanced circuit breakers use explosive charges and more sensitive measurement tools to switch the lever.