Playing is the most basic equipment in the audio system, and it is the source of expanding or reduced various volumes.The use of amplifiers in life is very wide, from the professional power amplifier in performance to special amplifier used in special occasions.Due to the considering power, impedance, distortion, dynamics, and different use scope and control adjustment functions, different amplifiers are also different in the internal signal processing, line design and production process.How to use a amplifier, how to repair the common faults of the amplifier?
What is the amplifier
The amplifier is commonly known as a "amplifier", which is an equipment for audio amplification.The amplifier circuit is the main component of audio and other circuits. A small radio and a MP3 listen to them. They need to be used in the stage audio equipment.A device, this is the amplifier.Audio power amplification is a very mature field. The components used in enlarged can be divided into four types: electron tube, crystal tube, integrated circuit, and field effect tube.For decades, people have made unremitting efforts, and they have made great progress in terms of line technology, components, and even ideological understanding.
How to use the amplifier
1. First look at the audio cable behind the amplifier and the audio. If not, you must first buy a section of the hardware store. You dont have to be too long, otherwise you will also put it behind.
2. The connection of the audio cable is easy. First, find a tigers pliers or scissors, and make the audio cable head out of the surface of the surface of the surface to expose the copper wire inside. Generally, there are two colors of bronze and silver.
3. After peeling the audio cable, twist the copper thread a few laps to make the copper wire stronger, and then see that there are red and black wiring columns behind the power amplifier, red columns of bronze, silver black colors with black black colors, silver pinrse black colors.column.
4. The other end of the audio cable also receives the back of the sound. Some sound is a wiring column, and some are more convenient. It is a buckle type.Press the buckle with your fingers, pinch the line in, and then let go, and the line is clamped by the buckle, which is very simple.
5. If you are two sounds, connect the line on both sides of the left and right, which is the one line on the left and right.
6. After the amplifier and the audio are connected, you must enter the sound source to the amplifier. The sound source is generally used to use the DVD player. If you allow it, you can also use notebooks, etc., and make it more flexible.There are two audio cables of the Lotus head with both ends. The L and R channel output sound signals inserted under the OUTPUT after DVD are also inserted on L and R on the amplifier, but note that it is input input.In this way, the sound will be output from the DVD to the amplifier, and then output from the amplifier to the sound.
7. In the end, you can open DVD and power amplifiers for testing. As long as the line is not connected, you can hear the sound.
How to repair common faults in the amplifier
1. The whole machine does not work
1. Failure phenomenon
The failure of the whole machine does not display after power -on, and the capacity of the amplifier is not displayed. Each function key is invalid, and there is no sound.
2. Maintenance method
During the maintenance, the power circuit should be checked first, the power supply should be connected, and the DC resistance value at both ends of the power plug with a multimeter should be used to measure the resistance value of both ends of the power plug.If the gap is too large, and the power transformer is severely heated, it means that the primary circuit of the power transformer has a local short circuit.If it is infinite, check whether the primary winding of the transformer is open, whether the fuse is melted, and whether there is a break between the plug and the power cord.
Second, no sound output
1. Failure phenomenon
The silent fault is displayed in the corresponding state when the function key is operated, but there is no signal output.
2. Maintenance method
When repairing a amplifier with a protective circuit, you should see if the relay can be absorbed after booting.If the relay has no action, the power amplifier in the amplifier circuit should be measured. Whether the overflow detection voltage is normal and the output voltage is offset.If the mid -point output voltage offsets or an abnormal voltage detection voltage is detected, it means that the power magnification circuit is faulty, and the positive and negative power supply should be checked.If the positive and negative voltage is asymmetric, the load circuit that can be disconnected and negatively negative, so that the power amplifier circuit is faulty or the power circuit itself is abnormal.If the positive and negative power supply is normal, it should be checked whether the amplifier tube in the circuit is damaged.
Three, sound light
1. Failure phenomenon
Sound light means that the audio signal is in the process of amplification and transmission. During a magnifying level of amplifier or attenuation in a certain link, the gain of the amplifier decreases or the output power is smaller.
2. Maintenance method
During the maintenance, you should first check whether the signal source and the speaker are normal, and the replacement method should be checked.Then check the various conversion switches and control potentiometers to see if the sound volume can become larger.If it is normal, it depends on whether the fault is in the front or the rear circuit.For a certain channel sound, the signal of its front -level circuit can be exchanged to the rear circuit of another channel.If the sound of the speaker is unchanged, the fault is in the rear circuit.
Fourth, noise
1. Failure phenomenon
The noise of the amplifier has the sound of communication, burst, induction noise and white noise
2. Maintenance method
During maintenance, the noise should be judged first or from the rear circuit.Remove the front and rear signal connection plugs. If the noise is obviously obvious, it means that the fault is in the front circuit.Conversely, the fault is in the rear circuit.

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