【 Weak current College 】 homemade projector utility maintenance technical information (4)---Power By 【 China power house network 】

2, professional cleaning of multimedia projector.
Import professional multimedia projectors due to the complexity of optical engine, lenses, cleaning is important to note that are not familiar with maintenance personnel can clean a pack, in order to avoid confusion, otherwise the screen is not working properly, and others to fail, its optical engine as in Figure 7:

Multimedia projector light path is clean will have a direct impact on the projection screen, and dust directly affect the normal use of the LCD projector. Due to the LCD panel size smaller, usually in the 0.5 ~ 1.5, very small dust adhesion above will be magnified many times, the screen will form a lot size of BLOB, Lens Blur is seen more clearly. And clean LCD panels and more difficult, since the LCD Board surface of Polaroid is organic polymer membrane, it is not advisable to use organic solvents such as bananas, water, alcohol, otherwise it will damage the Polaroid. Due to the LCD Panel and polarization between the distance is small, it is difficult to have a way to clean, the foreign here using high pressure air cleaning, but also the absence of such equipment in China, how to clean it, this is a practical and simple way, it is our long-term use reflected experience.
Prepare a clear plastic basin, in the basin in clean water, the water drops in just the right amount of weak acid detergent, preferably a dishwashing detergent, and then place all lenses, LCD Panel Assembly all placed into water soaking, with a flat fine bamboo and bamboo bar around cotton into LCD panels and gently scrub, between the polarizers, other lenses used cotton cleaning method, after washing with water, rinse several times more, conditional reusable distilled water rinsing once and then use hot air blow dry. This method is the LCD Board down cleaning separately, but in the end, coincide more difficult, generally do not advocate particular inexperienced officers it is difficult to be coincidence. While the lens cleaning is relatively simple, direct use of cleaning paper gently wipe the lens, built-in dust and wind road dust conditions available vacuum cleaner edge brush edge suction, which can effectively prevent dust flying around. Machine outside of filter water after washing to dry, typically half a month or once a month, cleaning, depending on the work environment.
3. Professional import machine and engineering machines refurbishment process
Because the import projector and overhead projector its casing consists of standard mould one-time Huebner, its surface in use and transportation easily scratched and dirty. With its sales volume increases, some machines will gradually return to return to the old machine, and fault-handling after sales, they must be renovated and the type of machine cabinet with electrostatic spray and spray, generally subcontracted processing. The renovation of the former must remove the enclosure and are prohibited from using the machine sent to, or damaged internal circuit, usually not for renovation, but internal optical path must be clean, its cleaning methods mentioned earlier.
Ultrasonic cleaning circuit board
Circuit board with ultrasonic cleaning is a good way to clean out the circuit board clean like new, using ultrasonic in principle, the energy is converted into mechanical vibration, and the vibration generated by the high-pressure bubble, bubble bursts breaking force bombardment circuit board. It is important to note the correct selection of ultrasonic power, in the cleaning process should not be current tuning too large, its power and container volume is generally proportional to how much the selects ultrasonic cleaning according to the quantity of circuit boards, usually only suitable for high-volume circuit board, circuit board cleaning solution used by generally use. Organic solvents, water chemistry, banana with ethanol (alcohol), the Board will pale, commonly known as white.