【 Weak current College 】 (go) expert detailed professional audio troubleshooting tips 1-Power By 【 China power house network 】

Current professional audio equipment, upgrading is changing, so many devices in use which inevitably there are all sorts of trouble, some are on the device itself, and some of our audio division caused by improper use of the fault of the person, so we talk about the article: "professional sound system troubleshooting methods", I said failure is defined as "soft" fault, is designed for system operation in terms of failures, rarely involve real fault on the device itself, those considered "hard". I have always advocated the "professional", say what power amplifier is broken, Horn bad those are maintenance engineers, our sound engineer's job is to match a good sound system, the various sounds good, doesn't have to be jacks-of-all-trades! lift audio fault is really very painful because various fault really, very difficult in an article that clearly, I can only based on my years with various audio experience to fault of the article written in a simple pop up, I analyzed, generally sound kinds of system failure can be summarized as: total power failure, line failure, human operation breakdown, equipment failure, failure in itself, a total of five interference. The following is an analysis of a serve everyone, and this article explain also explains some troubleshooting audio, so we understand the cases it is even more simple and thorough.

A power failure, sound system

(A), total system power failure: in a previous article I made a sound system overall power profile is important to note the following points: 1, three-phase power: general use professional audio equipment for facilities will apply for the installation of three-phase power supply, the more important place also uses two separate three-phase power supply, just in case one fails so the whole system is down; even very important sites also use similar to PC "UPS" standby power, visible power is so important. 2, audio, lighting and power supply separately: this point in the previous article also told many times, sound system and lights it is best to have its own power, otherwise one is prone to interference, then a work is not secure. 3. total power distribution: light has a strong power is not enough, we must pay attention to the power of distribution: in principle, a mixer and a variety of audio sources equipment to have all the independent power; various peripheral equipment you want to have all the independent power; power amplifier and other equipment you need at least 2-channel independent power supply. Each one independent power supply with the corresponding air switch control, so we're switching equipment is very convenient.

(Ii), the device to a power failure: device itself power failures can also be divided into three parts: 1, device internal circuitry itself fails, the US General audio engineer can't exclude that need professional service personnel or equipment supplier to warranty. 2, power supply equipment, such as some DC-powered device to use a transformer, the transformer will fail sometimes; there is the power cord connected device has a problem, this situation rarely occurs, but also really good power line seems no problem is not powered on, and a power cable fault elimination. 3. patch equipment installations, such as device connected socket, power, timing, etc., the failure rate is very high in relative terms, especially in mobile performance to pay more attention.

(Iii), the power supply voltage, patch equipment failure: now better economic development, energy consumption is increasing, so the power supply voltage is very difficult to guarantee a constant standard, in this case many places using audio to hi-fi system is configured with a regulator, power equipment, but in the selection of devices it is important to note that regulator voltage power and quality; there are places with a power outlet or power source time series for quality rather poor, but also prone to failure. Power system failure case: 1, opened a new ballroom, the days debugging when voltage normal sound system, the system is working properly, but the evening performances, let alone the voltage low to 180 v, also some audio equipment is not working properly. I found this site using a three-phase power, sound system, a phase of lighting system and air conditioning system with a phase, other places a lighting system. When debugging a sound during the day in the ballroom of the lighting and air-conditioning are not open, therefore, power good, night, three-phase power imbalance issues came. Later, the air conditioning system is also a phase alone, the workplace lighting system using civilian electrical system, this three-phase power balance, you have resolved the problem. 2, a dance performance speakers are always issued "lol" the sound of impact, the results I found the quality of voltage regulator is not too good, whenever the regulator regulator pointer runout time speaker on "lol", and then replace the transformer, I found that sometimes there will be a power pulse sound, the results are found when pressing stage camera console, the sound is noise, then put the controller's power simply plug into civil electrical outlet, and ordinary mixer that road total power apart you have resolved the problem. The above example, we know the power failure is caused by a variety of, must rely on our careful installation, configuration and use, so the power part very critical and important.

Second, the sound system line fault

(A), the power line failure: the power of importance have already said, a stereo system using the power of many, there are all kinds of the power cord to connect, for example: sound mixer and sound source Player, and other peripheral equipment power supply, power supply, power supply, power stage, power active speakers, video system, and so forth, a part of the site require a power, so much power connector to secure, as far as possible to avoid malfunction.

(Ii), the signal line fault: If a sound system compared to a single person, then the sound system of signal connector is like a vessel like the "blood circulation", directly affect the stability of the sound system, but even knowing that the signal cable is so important, sometimes fault also occur, together with the following points: 1, signal qualityIssues, this failure is the most chill out, out of this kind of problem we side only innocent curse swear those traders, on the other side would also like to go back line pl., truly depressed. 2. sometimes we spent a good line, pre-installation testing without problems, but after the installation is wrong, this may be installed led signal cable damage, especially some long-distance transmission of wire rod, sometimes during installation when you wear hose too hard pull wire, it may cause damage to the wire; there may be other types of work in construction is accidentally damaged; there may be a wire is our lovely Mickey Mouse and molar power to bite off, anyway the cause of the failure, so off to put some more spare line. 3. signal line welding, welding the signal cable is on the one hand, it is necessary to pay attention to every spot welding quality, previously often see new buildings on the banner: "lasting, quality first" slogan, a hundred years is too long, at least we manufacture of signal lines within a few years to ensure that no fault? there are a variety of signal line is associated with various plug connection between correctly, such as XLR connector card you "1, 2, 3, three contacts, not confused, so the signal line welding fine after multimeter testing, will not be short circuit or open circuit.

(Iii), amplifier and speaker connection line fault: amplifier and speaker connections between the comparison to everyone, will adopt the high quality, thick one speaker cables, speaker cables failed in General is short, now speaker connections are 4-wire Plug and also good point, past many speakers are used, such TS6.35 plug plug shorting of risk will increase; the speaker cable is generally rare circuit breaker, thick line if the circuit breaker in General is artificial, is unlikely to be the issue of wire itself.

Line system failure case: 1, remember 94 years help a dance hall with several boxes 30, when the system sound control room, are all significant LD drive, dozens of boxes will be dozens, dozens of desk drive 14 inch TV doing video monitoring, so that when the tone control room equipment, lines or more, more complex, not like the sound control room, just a few computers. See project is finished, ready to power up the audio control room, I suddenly realized that something was amiss, I asked the electrical light bulb of 100W today so bright? voltage normal? he said no problem, just want to tone control room all device is powered on, I said, and so on, a volume with a multimeter, my day: 380 v! I can't believe the electrician such low-level errors, please let him watch, he just silly, this time the 100W bulb could not withstand high pressure also burned, front just plug in a set of telephone exchange also catches on fire! think really scared me, because the duration is 2 days immediately without sleeping, so an electrician will add the wrong line, but anyway, safety is most important! 2, 2000 friends companies to a customs do function room, where the stage to the tone control room is 80 meters above sea level, 8 on the stage, all only microphone 8 only microphone after opening the noise in the sound like rain is every bit as big as the fundamental acceptance. Then I went to look at all the meetings, decided to put the capacitance microphone TS6.35 Nonequilibrium plug cut off, all for you "by Jack, XLR card all balance transfers. Results 8 to do transmit only microphone, the normal volume, 2 meters away from the speaker basically did not hear the obvious noise, different signal lines, connectors, shaking, therefore we must note that the signal cable caused the failure. 3, 1992, I helped a dance hall adapted a little sound system, a new addition on the stage, the band due to the signal cable is too much I would allow the electrician help tidy up there, he took all the signal lines on the edge of the stage, and then with a large nail to fixed, I'm not good at that time although but didn't say anything, when professional consciousness of course didn't have such a strong now. Is there a mixer after bad, they are using a sound mixer YAMAHA2300 band power amplifier, one channel of the amplifier is broken, fix a day, I went to feel should be the speaker cable, an: really short! then check line, found the speaker cord carpet just from the stage, a few days before the big iron nail just nailed in the middle of the speaker cables, speaker cables at that time also are flat wire, nails through the middle of a short circuit, short circuit parts are made of a line is black and green, more terror, I was thinking: that Japan amp really badly, we put the nails to shaohua! then I cut the cord plugged in again, the boss said that mouse bit, otherwise the electrician ironclad laid-off. The above example, we know how terrible faults, these examples veteran may not be worth a look, but novice is different, and I cite examples of each are the "bloody" facts, I met so many years work, hoping this post will help.