We know that China has a large educational population and a wide range of schools. This has determined that the domestic education projection market is still in the long-term and will be in a dominant position. The Ministry of Education’s “100 million projects†have entered the actual stage, and schools at all levels are passing. Purchasing advanced teaching equipment - projectors to strengthen their own construction, so in the field of education, the penetration rate of projection products has been quite high, and even has become saturated.
No matter how popular it is, no matter how low its price is, the projection products are still sophisticated optical instruments. Whether it is a high-end or entry-level machine, whether it is the application of LCD or DLP technology, the daily operation of the projector has caused us to pay enough attention. We need to take care of the projector on weekdays, only care for it, and we will encounter problems and malfunctions when using the projector. We should not panic when encountering these failures. As long as we have a wealth of knowledge of the use, operation and maintenance, we can eliminate these common faults one by one, and only then can we ensure that our projection products have a longer service life.
During my study and work at school, the author has a certain understanding of the application of projectors in the field of education. I also believe that I can provide some common common faults and troubleshooting methods, and discuss with you the problems of changing the wicks, etc. The majority of educators help and apply multimedia projection systems.
Projector operation and maintenance instructions
Switching machine instructions
In general, the central control system consisting of a projector and a computer is generally equipped with an "open key". When using the multimedia system, we can directly press the "on" button. If the projector is not connected, you need to press the "on" button on the projector. In general, the projector will turn on within a few seconds.
At this time, the projection screen will be blue screen, then we need to select the "PC" related button to select the conversion computer VGA signal.
Turning off the projector is of course much simpler. Simply select the “Close†button on the panel, and some projectors require us to press the “Close†button for a long time when it is turned off. If the multimedia system is equipped with a direct "off" option, it is even simpler, and with a single button operation, we can completely shut down the multimedia projection system.
Pay attention to heat
We know that the projector's bulbs produce very high temperatures when they are working. In addition, the internal components of the projector are highly integrated and the volume is relatively compact. Therefore, for the use of the projector, heat dissipation is a problem worthy of our attention.
In use, we need to keep the projector in a well-ventilated environment, and do not put the bottom of the projector and the support surface too close. In addition, we should not place anything at the vent of the projection, especially the teacher, never put the book in the heat sink window.
In addition, the projector generally has two fans, one is an intake fan, which is used to suck the outside fresh air into the projector to cool the projector's components; the other is an exhaust fan, which is used to cool the components. The temperature of the air exits the projector. There is an air filter on the outside of the suction fan that filters out dust from the air and prevents it from entering the projector.
Therefore, we must first ensure the cleanliness of the application environment, and regularly clean the dust on the air filter net to prevent the intake air from affecting the cooling effect. When the projector is turned off, be sure to turn off the wait state first, and wait until the internal temperature of the projector is lowered, and then turn off the power switch after the fan stops. This must be paid special attention.
Care for the projection bulb
We know that the light bulb is the most important light source of the projector. Its working principle is very complicated. It will release a lot of heat during use, and each projection bulb is expensive. It is not a last resort, no one will take the projection bulb. Change to play. So, for the projection bulb, we have to take care of it.
First of all, pay attention to the sequence of the switch. If you do not follow the correct sequence, the projector bulb will probably not get good heat dissipation, which will cause unimaginable danger.
For those projections that do not support the instant-on function, after using the projector, the user should turn off the software switch in the projector's control panel to stop the projection lamp, and let the projection fan continue to work for a while. When the heat generated by the work is exhausted, the cooling fan stops working and then the power is turned off, which is also beneficial to the projection bulb.
Secondly, we must also pay attention to not switching the machine frequently. When switching between the power-on and power-off states, the user should keep it for about 5 minutes for heat dissipation. This is because the power supply part of the projector uses a transformer and a power switch. The electronic components, which generate a large amount of heat during frequent switching of the operating state, causing the internal working temperature of the projector to be too high, causing the bulb to explode.
In addition, we should not arbitrarily move the projector in use, because the filament inside the bulb usually works in a semi-molten state during projection. If the projection is frequently moved at this time, it is likely to damage the projection bulb.
Filament repair instructions
Sometimes, after we turn on the system, the light bulb can't start. Everyone thinks that the light bulb has burned down. In fact, according to our actual experience, this is usually caused by the breakage of the filament. We just need to connect it. Don't change the bulb when the bulb does not work.
Light bulb change wick
We know that the working life of a projection bulb is generally 2000-3000 hours, and its market price is a few thousand dollars. If the bulb is broken, it will greatly increase our use and maintenance costs.
In fact, if the lamp cup is intact, we don't have to change the bulb directly. Just change the wick. It is worth mentioning that the price of the wick is generally less than 1,000 yuan, and the replacement cost is extremely low.
In addition, we have to fully understand the replacement period of the projection bulb. If we are still in the after-sales service period, we will of course choose to find the original manufacturer, and the quality of the original bulb is more guaranteed.
Projector common problems and troubleshooting methods
Below, the author will introduce you to several common problems in the use of projectors, as well as their respective troubleshooting methods:
Press the on button and the projector does not respond
First, we should check that the power cord plug is in good contact; check that the filament or bulb of the projector bulb has exceeded its end of life. In general, lamp damage is a common phenomenon. When the lamp is lit, the temperature will rise rapidly to thousands of degrees, and the filament is in a semi-blown state. At this time, the projector must not be moved, otherwise it is easy to burn the filament or cause the bulb to burst.
After the power is turned on, the brightness is normal but the image cannot be displayed. After the projector is turned on, there is no signal input. Generally, it can be summarized as follows: First, it stays on four small screens after booting, especially the Sharp projector. When using this brand of machine, if the lamp is not fully cooled and the lamp is not fully cooled, the power will be cut off and the projector will automatically run this protection function.
Second, the signal is not switched correctly, except that the projection system button does not operate according to the corresponding instructions, and the output signal of the notebook is not switched out. Under normal circumstances, when the system keys are completely correct, we will also encounter the situation that the projector does not display. This is also because the signal is not switched correctly, the user needs to operate the buttons of the PC device and the projector correctly, and the related buttons depend on the machines of different brands.
Finally, we have to check that all signal lines are connected properly, that the connection plug is loose or that the contact is poor. In general, we should develop the correct operating habit of turning on the power of the projector after turning on the projector, and check whether the external video interface function of the computer is turned on.
Image color deviation
When using the projector, we usually have a relatively fixed debug of the color control parameters of the main menu. If this parameter setting is messed up by others, the projection display image will also be biased. At this point, we need to re-adjust it with the remote control.
In addition, the looseness of the plugs at both ends of the signal line (computer and projector end) causes the deviation from tilting or broken needles, which may cause a certain color signal to be transmitted. For example, in the case of a ceiling mounted projector, it is generally very Less movement, the distance from the computer will be far. If the connected video cable is too long, there will be certain problems with the projection display, and of course, serious signal attenuation or color cast may occur.
Image distortion
As with the above color settings, the screen adjustment function settings in the projector's main menu may be disturbed by others. We still need to re-adjust with the remote control;
Regardless of the projector's suspension or desktop assembly, the projector may be loose or tilted for a long time. At this time, certain image distortion may occur, and we need to reposition the body.
Text or image blur
In general, text or image blur is mainly due to problems with the focal length setting. At this time, we need to turn on the projector's setup menu and adjust the focus distance setting. When projecting the demonstration, we should pay attention to the proper distance between the projector and the screen. After the distance is fixed, adjust the focal length to make the text image clear.
In addition, if the projector lens is contaminated with dust, it may cause blurring of text or images. Especially for hanging projectors, if we don't use the lens cover for a long time, it will lead to thicker and thicker dust, which will also affect the projection presentation. At this time, we can carefully wipe the projection lens with a soft cloth, lens paper or special objects.
If the working life of the projector lamp is over, or if the liquid crystal display panel is seriously deteriorated, the above-mentioned blur phenomenon will occur, which generally shows that the brightness of the projection screen is lowered and the sharpness is lowered. In this case, we can send the projector to a professional service point for cleaning and maintenance, because the LCD panel and the bulb are not like the projection lens, we can not clean it casually.
Finally, the display resolution of the computer equipment should also match the projector, especially the refresh rate can not be adjusted too high. Check if the projector resolution is artificially adjusted too low, or the computer display refresh rate is too high, as this may blur text or images.
Horizontal or vertical stripes appear
At this time, we need to observe whether there are signal clutter interference around, such as fluorescent lamps, electric fans, air conditioners, and even cars, lightning, etc., which sometimes cause interference to the projector, and communication devices such as mobile phones may also cause computer interference. Effect, this may also cause horizontal streaks on the display screen.
In addition, if the signal connection cable from the computer to the projector is in poor quality, the plugs at both ends are loose, and the pins in the plug are soldered and soldered, this will also cause streaks, etc. We can also carefully address this point. Check the check.
Image size does not match the screen
We often encounter such a situation, the projection picture can not be displayed on the screen, not too big or too small. How to do it? We should check if the resolution of the computer should match the projector settings. If the resolution of the projector is set to 1024×768, and the resolution of the notebook is 800×600, the projected picture may appear too small to fill the display screen, and it will be very uncomfortable to watch.
Display image appears with spots
If there is a stain on the projection screen? We need to check the projector lens for dust or paper dust. In addition, if the display panel of the projector burns out, it may cause stains on the screen. If the stain is not large, the displayed image will not be affected too much, so we can make use of it, otherwise it needs to be returned to the manufacturer for replacement.
In addition, we should also develop the habit of shutting down with the remote control. After the projector's light bulb is extinguished, wait for a few minutes after the air cooling and cooling, then cut off the power supply. Do not directly power off the main power switch. This can cause rapid aging of the display panel, which in turn can cause stains on the displayed image.
Sudden shutdown caused damage
When applying the projector, we usually encounter sudden shutdown, such as sudden power failure in the classroom, power plug is cut off and so on. If the projector does not dissipate heat, such as dust accumulation in the inlet and outlet, the sponge filter is not clean for a long time, etc., or the function of the heat dissipation part is faulty, this may cause the internal temperature of the projection body to be too high, which may cause the projector to suddenly shut down. However, we need to pay special attention to the fact that after the power supply is suddenly cut off, we need to wait for the cooling and then turn it on. In fact, we don't have to worry too much.
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