(1) Common self -faults of tunes:

1. The volume push is not good, and the sound is intermittent at work.

2. The channel input port failure is easy to "up -up".

3. Control system disorders. In short, the failure of the mixer is nothing more than input part, output, control, power part, etc., which are generally caused by aging equipment.

(2) The common self -failure of equalizers:

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

2. Internal line failure in the balancer, such as only one -way signal output.

(3) Common self -faults such as pressure limits, electronic frequency division, professional feedback suppressor, professional delay device and other common faults:

In addition to the severe aging of the equipment, there are generally no major problems. At most, there is a little problem with adjusting the knob and the rear panel signal socket.

(4) Common faults of digital effectors:

1. Noise, digital effects have a certain digital noise when processing audio signals. If the signal line is not shielded, the noise will be like rain.

2. The core part of the digital effect is the digital processing chip. When these digital chips also fail, I have seen a Yamaha500 effector that can be turned on but not working. Complex digital chips can not be repaired at all.

(5) Common faults of power amplifiers and speakers:

1. The most common failure of power amplifiers is bad capacitors or burning power pipes. This has problems that usually use, but most of them are unstable equipment itself.

2. Some amplifiers will have a channel without sound failure. The problem is the circuit problem inside.

3. As for other failures, there are not good contacts, the left -right channel imbalance, the protection function is too frequent, the rear panel work conversion switch is not good, and the signal socket is not good. A kind of electrical equipment that is prone to failure.