HIFI sounds are generally expensive and difficult to repair, so we try to extend their service life. To make them last longer, we have to start maintenance from the time of installation. What is the scientific maintenance? Here are some basic common sense for daily maintenance.
1, the normal operating temperature of audio equipment should be 18 ° C ~ 45 ° C. Too low a temperature will reduce the sensitivity of some machines (such as tube machines); too high will easily burn out components or premature components. Special attention should be paid to cooling and maintaining air circulation in the summer.
2, audio equipment should avoid direct sunlight, but also to avoid close to heat sources, such as heating.
3. After the audio equipment is used up, the function keys should be reset. If the function key is not reset for a long time, the pulling button spring is under stress for a long period of time, and it is easy to cause malfunction.
4. Before switching the audio power supply, turn the volume potentiometer of the power amplifier to the minimum, which is the most effective protection for the power amplifier and the speaker. At this time, the power amplification of the power amplifier is almost zero, at least in the case of misoperation, it will not cause damage to the speaker. It is best to turn off the plug when plugging and unplugging the cable.
5, from the front to the back of the boot, that is, first open the CD machine, then open the front and rear levels, turn the power amplifier's volume potentiometer to the minimum when booting. Turn off the power amplifier first, and let the amplifier's amplification function be completely turned off. At this time, when you turn off the front-end equipment, no matter the large impact current, it will not affect the amplifier and the speaker. When the same level is closed, the volume potentiometer of the power amplifier should be turned to the minimum, and the CD player can be turned off or off before being turned off.
6. Don't mess with the wiring. Basically, all speaker products can't be inserted into the sound cable when playing music or turning on the high volume, because the plugging will cause the contact current to be unstable, thus producing sharp sounds and beats. These high frequency sounds may It will destroy the speaker unit and is more likely to "burn the speaker". Therefore, the user should develop the habit of first cutting off the power before plugging in the wiring, so that the horn can last longer.
7, the machine should be used. Commonly used can extend the life of the machine, such as some parts with a motor (recording stand, laser player, laser disc player, etc.). If it does not rotate for a long time, some parts will be deformed.
8, you must regularly power on. In the long-term non-use, especially in the humid, hot season, it is best to power on for half an hour every day. In this way, the heat generated by the internal components can be used to remove the moisture, and the internal coil, the speaker voice coil, the transformer and the like are protected from moisture and mold.
9. Wipe the surface of the machine with a clean, damp soft cotton cloth at regular intervals; when not in use, cover the machine with a dust cover or cloth to prevent dust from entering. Many players like to remove the air filter of the speaker to make the sound quality clearer. However, if the speaker is not protected, it is likely to accidentally damage the unit position, especially the mid-range speaker is a "high-risk family." If the user wants to enjoy high-quality music enjoyment, it is best to remove the dust-proof net of the front three speakers. It is best to put a dust-proof net on the back. When you use it, remember to cover it back, which can reduce the accident.
10. From the principle of electronics, any electronic device should not be connected or disconnected from other devices during live working. I don’t think there is much to say that friends can understand that it is very dangerous to plug in active devices. Passive devices such as microphones do not promote live plugging. Need to be reminded is not to open the amplifier to connect the speaker cable, because the speaker's terminal is generally close, the speaker cable is two tightly parallel, the wiring will often accidentally short the speaker cable, its The consequence will be the rapid burning of the amplifier. Although some amplifiers have protection lines, some HI-FI-class pure power amplifiers often save this part of the protection measures in order to improve the sound quality and reduce unnecessary sound and dye. Therefore, the phrase "shutdown and rewiring" has long been a rule that enthusiasts must follow.
11, some pay attention to some enthusiasts in the power amplifier heat engine will not push the button and put some burst of music, the reason is that the power amplifier components are in the cold state when they are turned on, then let their high current work will shorten their life. Therefore, some enthusiasts only put some soft music and listen to music at medium volume within half an hour after starting the power. After the warm-up of the standby device, the volume is appreciated.
12, the horn is like wine, the more durable it is, the better the sound. The newly purchased speaker, the state should still not reach its peak, so the user should play the music for hours to one day as a "warm up". Of course, the 5.1 speaker needs to play some movies or concerts that support the five-channel output, so that it is very important to relax the diaphragm of all the speakers and the subwoofer to make the sound quality softer and more natural.
WDM (Wavelength Division Multiplexing) combines two or more optical carrier signals of different wavelengths (carrying various information) at the transmitting end through a multiplexer (also known as a multiplexer), and The technology of transmitting in the same optical fiber coupled to the optical line; at the receiving end, the optical carrier of various wavelengths is separated by a demultiplexer (also called a demultiplexer or demultiplexer), and then the optical carrier is The receiver performs further processing to restore the original signal. This technology of simultaneously transmitting two or more optical signals of different wavelengths in the same optical fiber is called wavelength division multiplexing.
Wavelength division multiplexing is a technology that uses multiple lasers to simultaneously send multiple lasers of different wavelengths on a single fiber. Each signal is transmitted in its unique color band after being modulated by data (text, voice, video, etc.). WDM can greatly increase the capacity of the existing fiber optic infrastructure of telephone companies and other operators. Manufacturers have introduced WDM systems, also called DWDM (Dense Wavelength Division Multiplexing) systems. DWDM can support the simultaneous transmission of more than 150 light waves of different wavelengths, and each light wave can reach a data transmission rate of up to 10Gb/s. This system can provide a data transmission rate of more than 1Tb/s on an optical cable that is thinner than a hair.
Optical communication is a way in which light carries signals for transmission. In the field of optical communications, people are accustomed to naming them by wavelength instead of frequency. Therefore, the so-called Wavelength Division Multiplexing (WDM) is essentially frequency division multiplexing. WDM is a system that carries multiple wavelengths (channels) on one optical fiber, and converts one optical fiber into multiple "virtual" fibers. Of course, each virtual fiber works independently on a different wavelength, which greatly improves the transmission capacity of the optical fiber. . Because of the economy and effectiveness of the WDM system technology, it has become the main means of expanding the capacity of the current optical fiber communication network. As a system concept, wavelength division multiplexing technology usually has three multiplexing methods, namely, wavelength division multiplexing with wavelengths of 1 310 nm and 1 550 nm, sparse wavelength division multiplexing (CWDM, Coarse Wavelength Division Multiplexing) and dense wave Division Multiplexing (DWDM, Dense Wavelength Division Multiplexing).
CWDM, DWDM, FWDM, LAN WDM, FBT WDM, AAWG WDM, Other WDM Related Equipment
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