Daily maintenance of projector

I. the projection environment light cannot be strong, and the best is weak light < br / >
The projection quality of projector is not only related to the brightness of projection bulb, but also to the influence of projection environment. The light intensity of projector working environment will directly affect the effect of projection. Therefore, before using the projector, we must first arrange the working environment of the projector to make the projector bulb work in the dark light environment as much as possible. Bright ambient light will make the brightness effect of the projection bulb worse, and students will have difficulty watching. In order to make the projector get a better projection effect, we might as well install dark opaque curtains in the room to block the outdoor light. The walls of the room use materials that are not suitable for reflection. These details will make the projector produce a better projection effect when the brightness of the projection bulb is the same.



2. Pay attention to the sequence of power switches < br / >
The correct switching of projector power supply has a great influence on the service life of projector bulb and its internal accessories. If the power of the projector is turned off at random, the projector bulb and the power of the circuit part of the projector may be turned off together, so that the cooling fan inside the projector stops working due to the power failure, resulting in the large amount of heat generated by the projector bulb and the projector during the working process can not be discharged through the cooling fan in time, which is likely to cause the explosion of the projector bulb. Damage the internal circuit board so that the projector does not work properly. The correct operation sequence for switching the power on and off of the projector is: turn on the power first, and then press and hold the indicator light button on the projector control panel until it does not flash; you can also send the power on command through the power on button on the remote control, and the projector will start up according to the preset power on procedure. When shutting down the projector, do not directly cut off the power supply. First press and hold the shutdown indicator button until the light does not flash. (at this time, the cooling fan inside the projector continues to operate and dissipate heat, and stops rotating after about 5 minutes); you can also issue the shutdown command through the shutdown button on the remote control, and then the CPU inside the projector will instruct the cooling fan to dissipate heat at full speed. At the same time, the CPU will detect the temperature inside the projector. If it is above 40 ℃, it will issue the command to make the cooling fan continue to operate and dissipate heat, if it is at 4 ℃. If the temperature is below 0 ℃, send out the command to stop the cooling fan, and inform that the power can be cut off by means of the indicator light, then cut off the power supply of the projector.



III. there should be a certain time interval between restart after shutdown < br / >
When the projector is switched from the on state to the off state, the heat dissipation time shall be at least 5 minutes apart. Because the power supply of the projector adopts the method of switching power supply to reduce voltage, stabilize voltage and stabilize power. When switching on and off frequently, the high-power switch tube and transformer used by the projector power supply work at a higher frequency, and the switch tube will produce considerable power consumption in the process of frequent switching, and these lost power will turn. When the power supply of the projector is switched on and off frequently, it will produce a great current impact on the projector bulb, which is easy to cause damage to the projector bulb. It may also cause damage to the projector bulb. Broken parts in the circuit.



IV. the power supply voltage used shall be stable < br / >
The stability of power supply means that the projector and its signal source (that is, the computer connected with the projector and providing projection signal for the projector) should be connected to the same good quality power socket. The projector and its signal source use the same good quality power socket, which can avoid the sparking between the sockets caused by plugging in and out of the power supply, damage the power supply circuit inside the projector, and prevent the possible power mismatch problem, so as to ensure the normal operation of the projector. In order to prevent the explosion accident of the projection bulb and the power mismatch of the projector, the power specifications of the projector are strictly regulated. When the user connects the projector to the power outlet. When users plug and unplug the signal line or other circuits with power, there will be a spark between the plug and socket, which will damage the signal input circuit, make the projection bulb can not work normally, seriously damage the projector, and even cause fire accidents. Therefore, the power cord attached to the projector must be used. Sometimes, because the extension cord is required during use, the power extension cord shall be copper core wire with good quality, and the wire diameter shall not be too thin; at the same time, the power socket connected with the power cord shall be reliably grounded.



V. cannot work continuously for more than four hours < br / >
If the projection bulb works continuously for more than four hours, the accumulation of heat emitted by the imaging system inside the projector will cause the temperature inside the projector to rise rapidly, because the quartz on the inner wall of the projection bulb will produce the phenomenon of loss of transparency under high temperature, which will cause white spots on the shell of the projection bulb, and the loss of transparency will block the light from shooting out in a large amount, making the projection lamp The temperature of the local area of the bubble shell increases abnormally, which makes the devitrification area expand further, makes the brightness of the projection bulb decay rapidly, and easily leads to bulb explosion. Therefore, it is very necessary for the projector to stop working and cool down in time to prolong its service lifeDo not allow the projector to work for more than four hours at a time.



Vi. it is strictly prohibited to shut down abnormally or cut off power suddenly < br / >
At present, most projectors use cold light source system. The electric and optical conversion efficiency of projection bulb is high, and the heat generated is greatly reduced compared with the original metal halide bulb. However, the volume of current projectors is generally small, and it is easy to form accumulated temperature in some parts, which requires fast heat dissipation by exhaust channel, which requires the cooling fan to be powered on for a period of time after shutdown. So that the accumulated temperature inside the projector can be distributed in time. Because of this, the switching operation of the projector on and off must be carried out in strict accordance with the normal on and off sequence. Abnormal shutdown is a kind of misoperation that seriously violates the on-off process. This misoperation can reduce the effective life of projection bulb for up to 200 hours or even longer each time, which is costly and must be avoided. Sudden power failure is more harmful to the projector than abnormal shutdown, because the sudden power failure causes too high internal accumulated temperature of the projector, which may cause the chipset on the main board to work abnormally, resulting in image yellowing, no signal output and other faults.



VII. Regular dust removal < br / >
In the process of using the projector, it is often necessary to install a hanging box to hang in the air. This kind of environment is easy to accumulate a large amount of dust, which can easily lead to overheating protection of the projector in half an hour of starting up, and it can not be started up. In the high temperature and humidity season or area, the humidity will make the dust accumulated on the shell of the projection bulb form a cement like film layer, which will cause the local accumulated temperature of the projection bulb to be too high, the heat will expand and shrink, and the projection bulb will burst. Therefore, regularly ask professional personnel to clean up the dust and prolong their service life. The reason for prolonging the life of the lamp is to first safely turn off the machine and fully dissipate heat. Secondly, keeping the environment clean and tidy, and using it in too wet places will also shorten the service life of the bulb. However, at present, many projector products are equipped with good heat dissipation design and other means to improve the utilization of light source.The service life of the bulb has a better continuation.