Daily maintenance and maintenance of projector

1. projection environment light should not be strong, preferably weak light
The projection quality of the projector is not only related to the brightness of the projection bulb, but also to the impact of the projection environment. The light intensity of the projector's working environment will directly affect the projection effect. Therefore, before using the projector, the working environment of the projector must be arranged to make the projection bulb work in a dark environment as much as possible. Bright ambient light will make the brightness effect of the projection bulb worse, and students will be hard to watch. In order to make the projector get better projection effect, we may as well install dark opaque curtains in the room to block the outdoor light, and the walls of the room use materials that are not suitable for reflection. These details will make the projector produce better projection effect under the same brightness of the projection bulb.

2. should pay attention to the power switch sequence
Proper power on and off of the projector has a significant impact on the life of the projector bulb and its internal accessories. If the power supply of the projector is turned off indiscriminately, the power supply of the projector bulb and the circuit part of the projector may be turned off together, and the cooling fan inside the projector may stop working due to the power failure, resulting in the large amount of heat generated by the projector bulb and the projector during operation. The heat cannot be discharged through the cooling fan in time. This situation is likely to cause the projection bulb to explode, damage the internal circuit board, and the projector cannot work normally. The correct operation sequence for switching the power on and off of the projector is: turn on the power first when turning on the projector, and then press and hold the indicator button on the projector control panel until it does not flash; You can also give a boot command through the boot button on the remote controller, and the projector starts up according to the preset boot program. When shutting down, never cut off the power supply of the projector directly. You should press and hold the shutdown indicator button until the light does not flash. (At this time, the cooling fan inside the projector continues to run to dissipate heat and stops rotating after about 5 minutes); You can also issue a shutdown instruction through the shutdown button on the remote controller. At this time, 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 an instruction to make the cooling fan continue to dissipate heat, then an instruction is issued to stop the cooling fan, and the indicator light is displayed to inform that the power can be cut off, and then the power supply of the projector is cut off.

3. shutdown and then boot should have a certain time interval
When the projector switches from the power-on state to the power-off state, the heat dissipation time should be at least about 5 minutes. Because the power supply of the projector adopts the method of switching power supply to reduce the voltage, stabilize the voltage and stabilize the power of the commercial power supply, when the frequent startup and shutdown switching operations are carried out, the high-power switch tube and transformer used by the projector power supply work at a higher frequency, and the switch tube will generate considerable power consumption during the frequent switching process, and the power loss will be transferred into heat to emit, as a result, the temperature inside the projector rises. In addition, the heat emitted by the bulb itself gathers in the narrow space inside the projector, and the sudden change of temperature can easily cause the projection bulb to explode. In addition, frequent switching on and off of the projector power supply will also produce a large current impact on the projection bulb, which will easily lead to damage to the projection bulb. It may also damage parts in the circuit.

4. the use of power supply voltage to be stable
The stability of the power supply means that the projector and its signal source (that is, the computer connected to the projector and providing the projection signal for the projector) should be connected to the same good quality power outlet. The projector and its signal source use the same good quality power socket, which can avoid the ignition phenomenon between the sockets caused by plugging and unplugging the power supply, damage the power supply circuit inside the projector, and prevent the possible power mismatch problem to ensure the normal operation of the projector. In order to prevent the explosion of the projection bulb and the mismatch of the working power of the projector, the power supply specifications used by the projector have strict regulations. When the user connects the projector to the power outlet. When the user is charged to plug and unplug the signal line or other circuits, it will cause ignition between the plug and socket, damage the signal input circuit, make the projection bulb unable to work normally, seriously damage the projector, and even cause a fire accident. Therefore, it is necessary to use the power cord attached to the projector. Sometimes, because the extension cord is required during use, the power extension cord should use copper core wire with good quality and the wire diameter should not be too thin. At the same time, ensure that the power socket connected to the power cord should be grounded reliably.

5. cannot work continuously for more than four hours
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 cause devitrification under high temperature, which will cause white spots on the shell of the projection bulb. The devitrification will block the light from emitting a large amount, causing the temperature of the local area of the projection bulb shell to rise abnormally, promote the further expansion of the devitrification area, so that the brightness of the projection bulb is rapidly attenuated, and it is easy to cause the bulb to explode. Therefore, timely let the projector stop working, cooling, to extend the life of the projector and projection bulb is very necessary, do not: the duration of each work of the projector can not exceed four hours.

Abnormal shutdown and sudden power failure
of the 6. are strictly prohibited At present, most projectors adopt cold light source system. The electric and optical conversion efficiency of projection bulbs is high, and the heat generated is greatly reduced compared with the original metal halide bulbs. However, the current projectors are generally small in size and easy to form accumulated temperature locally. It is necessary to rely on the exhaust channel to quickly dissipate heat. This requires the heat dissipation fan to continue to be energized for a period of time after shutdown, so that the accumulated temperature inside the projector can be dissipated in time, because of this, when switching the projector on and off, it must be strictly in accordance with the normal on and off sequence. Abnormal shutdown is a serious violation of the wrong operation of the power-on and power-off process, which can reduce the effective life of the projection bulb by up to 200 hours or even longer at a huge cost and must be avoided. The damage caused by sudden power failure to the projector is more serious than abnormal shutdown, because the sudden power failure causes the internal accumulated temperature of the projector to be too high, which may cause the chipset on the motherboard to work abnormally, resulting in faults such as yellowing of the image and no signal output.

7. regular dust removal
During the use of the projector, it is often necessary to install a hanging box suspended in the air. This environment is easy to accumulate a large amount of dust, which can easily cause the projector to generate overheating protection within half an hour of startup and cannot be started. In hot and humid seasons or regions, humidity will cause the dust accumulated on the shell of the projection bulb to form a cement-like film layer, which will cause the projection bulb to burst due to excessive local accumulated temperature, thermal expansion and contraction during the working process. Therefore, regularly ask professionals to clean up the dust and extend the service life. Based on the above reasons, the fundamental to extend the life of the bulb is to shut down safely and fully dissipate heat. Secondly, keep the use environment clean and tidy. Use in too humid 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 rate of the light source, so that the life of the bulb has a better continuation.