3M as an international brand from the United States, its 3M projector products sell well in the domestic market. However, after a long period of use, 3M projectors also have a variety of problems. The author will today analyze the five common types of faults and precautions for using 3M projectors.
Fault type one: mechanical aspects
Prevent strong collisions, squeezing and vibrations. Because the strong earthquake can cause the displacement of the liquid crystal film and affect the convergence of the three LCDs during the screening, the phenomenon of RGB colors not overlapping occurs, and the lenses and mirrors in the optical system may also be deformed or damaged, affecting the image quality. The zoom lens is Under the impact will also make the track damaged, resulting in the camera stuck, even the lens can not be used.
Fault Type II: Optical System
Currently used polycrystalline silicon LCD panels are generally only 1.3 inches, and some even only 0.9 inches, and the resolution has reached 1024X768 or 800X600, which means that each pixel is only 0.02mm, dust particles enough to block it. Because the projector's LCD panel has sufficient heat dissipation, fans are usually air-cooled by tens of litres of air per minute. High-speed air may also carry tiny particles of dust after they pass through the filter dust net. They rub against each other to generate static electricity. In the system, this will easily absorb the projection image in the optical system.
The current polysilicon LCD panels are still more afraid of high temperature, so newer models are equipped with temperature sensors near the LCD panel. When the air inlet and filter mesh are blocked and the airflow is not smooth, the temperature inside the projector will rapidly increase. The temperature sensor will alarm and cut off the light source circuit. Therefore, it is necessary to keep the air inlet open and clean the filter in time.
Fault type three: cooling system
When we hoist the projector, we usually only pay attention to the surrounding environment and forget about the rise of hot air. The projectors working on the ceiling have very different temperatures from those below, so we cannot ignore this.
Fault type four: light source section
At present, most projectors use metal Halide lamps or new cold light bulbs (UHE or UHP). When lit, the voltage across the bulb is about 60-80V, and the gas pressure in the bulb is greater than 10kg/cm. There are thousands of degrees and the filament is in a semi-molten state. Therefore, it is forbidden to vibrate when it is turned on. Move the projector so as to prevent the lamp from bursting. You cannot disconnect the power immediately after you stop using it. To allow the machine to automatically shut down after the heat is removed, the projector will be damaged when the machine is still in a hot state. One of the common reasons for rework. In addition, reducing the number of start-ups is beneficial to lamp life.
Fault Type 5: Circuit Section
It is strictly forbidden to insert and remove the cable with power. It is best to share the signal source and projector power at the same time.
This is because when the projector is connected to a signal source (such as a PC) with a different power source, there may be a high potential difference between the two neutral lines. When the user hot-plugs a signal cable or other circuit, a flashing phenomenon occurs between the plug and the socket, which damages the signal input circuit, thereby causing serious consequences.
However, when the projector is in use, some users require a large distance between the source and the projector. For example, a projector that is hoisted is generally more than 15 meters away from the signal source. At this time, the corresponding signal cable must be extended. As a result, the input projector's signal will be attenuated, and the projected picture will have blur tails and even jitter. This is not a malfunction of the projector and it will not damage the machine. The best way to solve this problem is to add a signal amplifier after the signal source to ensure that the signal is transmitted over 20 meters without problems.
Top Ten Precautions for Using the 3M Projector: 1. Use the projector's original cables and wires as much as possible. 2. Keep the projector away from water or moisture when using the projector. 3. Pay attention to the dust, and take dust-proof measures after consulting a professional. 4. Use the projector away from heat sources 5. Observe the nominal value of the power supply voltage, the machine's ground wire and power polarity 6. Do not repair and open the unit by yourself. Replace the internal cable parts with the original parts as much as possible. 7. The projector is not used. When it is necessary to cut off the power supply 8. When the projector is in use, unplug the power supply if it is found to be abnormal. 9. After use, allow the projector to cool down 10. The machine must be moved with care, gently handle it, and transport it carefully. shockproof
Fault type one: mechanical aspects
Prevent strong collisions, squeezing and vibrations. Because the strong earthquake can cause the displacement of the liquid crystal film and affect the convergence of the three LCDs during the screening, the phenomenon of RGB colors not overlapping occurs, and the lenses and mirrors in the optical system may also be deformed or damaged, affecting the image quality. The zoom lens is Under the impact will also make the track damaged, resulting in the camera stuck, even the lens can not be used.
Fault Type II: Optical System
Currently used polycrystalline silicon LCD panels are generally only 1.3 inches, and some even only 0.9 inches, and the resolution has reached 1024X768 or 800X600, which means that each pixel is only 0.02mm, dust particles enough to block it. Because the projector's LCD panel has sufficient heat dissipation, fans are usually air-cooled by tens of litres of air per minute. High-speed air may also carry tiny particles of dust after they pass through the filter dust net. They rub against each other to generate static electricity. In the system, this will easily absorb the projection image in the optical system.
The current polysilicon LCD panels are still more afraid of high temperature, so newer models are equipped with temperature sensors near the LCD panel. When the air inlet and filter mesh are blocked and the airflow is not smooth, the temperature inside the projector will rapidly increase. The temperature sensor will alarm and cut off the light source circuit. Therefore, it is necessary to keep the air inlet open and clean the filter in time.
Fault type three: cooling system
When we hoist the projector, we usually only pay attention to the surrounding environment and forget about the rise of hot air. The projectors working on the ceiling have very different temperatures from those below, so we cannot ignore this.
Fault type four: light source section
At present, most projectors use metal Halide lamps or new cold light bulbs (UHE or UHP). When lit, the voltage across the bulb is about 60-80V, and the gas pressure in the bulb is greater than 10kg/cm. There are thousands of degrees and the filament is in a semi-molten state. Therefore, it is forbidden to vibrate when it is turned on. Move the projector so as to prevent the lamp from bursting. You cannot disconnect the power immediately after you stop using it. To allow the machine to automatically shut down after the heat is removed, the projector will be damaged when the machine is still in a hot state. One of the common reasons for rework. In addition, reducing the number of start-ups is beneficial to lamp life.
Fault Type 5: Circuit Section
It is strictly forbidden to insert and remove the cable with power. It is best to share the signal source and projector power at the same time.
This is because when the projector is connected to a signal source (such as a PC) with a different power source, there may be a high potential difference between the two neutral lines. When the user hot-plugs a signal cable or other circuit, a flashing phenomenon occurs between the plug and the socket, which damages the signal input circuit, thereby causing serious consequences.
However, when the projector is in use, some users require a large distance between the source and the projector. For example, a projector that is hoisted is generally more than 15 meters away from the signal source. At this time, the corresponding signal cable must be extended. As a result, the input projector's signal will be attenuated, and the projected picture will have blur tails and even jitter. This is not a malfunction of the projector and it will not damage the machine. The best way to solve this problem is to add a signal amplifier after the signal source to ensure that the signal is transmitted over 20 meters without problems.
Top Ten Precautions for Using the 3M Projector: 1. Use the projector's original cables and wires as much as possible. 2. Keep the projector away from water or moisture when using the projector. 3. Pay attention to the dust, and take dust-proof measures after consulting a professional. 4. Use the projector away from heat sources 5. Observe the nominal value of the power supply voltage, the machine's ground wire and power polarity 6. Do not repair and open the unit by yourself. Replace the internal cable parts with the original parts as much as possible. 7. The projector is not used. When it is necessary to cut off the power supply 8. When the projector is in use, unplug the power supply if it is found to be abnormal. 9. After use, allow the projector to cool down 10. The machine must be moved with care, gently handle it, and transport it carefully. shockproof
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