Troubleshooting of common faults of audio equipment

At present, some domestic equipment has relatively more equipment failures. The following is a brief introduction to the common failures of professional audio equipment:

1. Common faults of the mixer:

1. The volume fader has poor contact and the sound is intermittent when working.

2. Channel input port failure. For example, the XLR input port of the old-fashioned Budweiser mixer can easily be "uprooted". When I first encountered this kind of failure, I couldn't believe my eyes.

3. The control system is disordered. Once I used a 16-channel mixer from Soundcraft, but found that there was no signal coming out of the total output. Later, I changed it to the group output. Later, there was no signal output from the group. And when I pushed the fader of the 10th channel, the sound of the 11th channel came out. Later, I used the AUX output signal and other methods, but finally the mixer was completely out of service. At this time, the performance was in progress and I couldn't let it get cold, so I simply gave the CD player signal directly to the power amplifier to play some music. This is the first time I have encountered a mixer failure like this in so many years, and I have never heard of it before. In short, the failure of the mixer is nothing more than the input part, output part, control part, power supply part, etc., which is generally caused by aging of the equipment.

2. Common faults of the equalizer:

1. Equalizer push-pull key contact failure, which is the most common, is mainly due to equipment aging and harsh environment.

2. The equalizer’s internal circuit is faulty. I have seen some equalizers that only have one signal output. Later I found that the circuit was broken. There are quite a few such equalizers. I have encountered them several times.

3. Common inherent faults of compressors, electronic crossovers, professional feedback suppressors, professional delay devices, etc.: Except for serious aging of these devices, there are generally no major problems. At most, there are some minor problems with the adjustment knobs and the signal jacks on the rear panel.

4. Common faults of digital effects:

1. Noise problem. Digital effects processors have certain digital noise when processing audio signals. If the signal line is not well shielded, the noise will be like rain in serious cases.

2. The core part of the digital effects pedal is the digital processing chip. These digital chips may also malfunction. I have seen a YAMAHA500 effects pedal that can be turned on but cannot work. All the programs inside cannot be adjusted and used, and such a complex digital chip cannot be repaired at all.

5. Common faults of amplifiers and speakers:

1. The most common failure of power amplifiers is bad capacitors or burned power amplifier tubes. This is a problem we use, but most of the time it’s because the equipment itself is unstable.

2. I also found that some amplifiers may have a channel without sound, and the problem is still the circuit inside.

3. As for other faults, there are problems such as poor contact of the power amplifier volume potentiometer, imbalance of left and right channels, too frequent protection function, poor contact of the rear panel working conversion switch and signal jack. In short, the power amplifier is an electrical device that is more prone to failure in the current audio system.

4. The most common speaker failure is of course the speaker problem. It can be said that the most common failure in an audio system is the burning of the speaker. This is of course due to human factors, but most of the time it is a problem with the quality of the speaker itself.

5. Another common fault of the speaker is the aging of the wiring port and poor contact, especially for speakers that are often moved. The above equipment faults are generally not repairable by sound engineers. I have said in the previous article that sound engineers must be "professional". If the power amplifier or speaker is broken, it is the job of the maintenance engineer. The scope of our work is to match the sound system and adjust the various sounds.