Maintenance method of small voice 1. The adjustment of the speaker sound knob does not work.
Symptom: The volume adjustment knob of the speaker doesn't work. The performance is as follows:
1. No matter whether the knob is turned to the minimum or maximum or any middle section, the sound of the speaker is the maximum volume at normal time.
2. When the knob is turned to the minimum or maximum, the sound is slightly lower; Turn the knob to any section in the middle, the sound is slightly louder and slightly muddy.
3. The failure of knob potentiometer has been eliminated. Using multimeter to measure the resistance of potentiometer, it is found that it can change evenly with the rotation of knob.
Maintenance method: If it is normal, rotate the potentiometer to the minimum and directly short-circuit the input signal to the ground, so that no signal is transmitted to the power amplifier, and the power amplifier is absolutely silent. According to the above, if the potentiometer is changed, it still can't be adjusted, indicating that the signal is not short-circuited to the ground, and the potentiometer is good. The only explanation is that the copper foil at the grounding end of the amplifier potentiometer is broken (or the connecting wire is broken), so that the signal is not short-circuited to the ground (or the resistance is high). If the speaker maintenance master is still not well maintained, it means that the master is not at home.
Two, big horn, big horn.
Symptoms: The sound plays normally, but one speaker is loud and the other speaker is low.
If you press the volume speaker adjuster button to one side by hand, the volume of the two channels will be the same. This fault is very similar to the previous page, and it is also a problem with the volume speaker adjustment button. Because the left and right channels of the volume speaker adjuster button are independent. Because the reed is used for a long time, the elasticity of the inner reed is too weak to be in close contact with the carbon resistor.
Solution: This is also relatively simple. Just adjust the reed by hand.
Third, the volume of the speaker is sometimes large and sometimes small.
Fault phenomenon: When the speaker knob is used to adjust the sound, the sound is noisy and the volume is up and down.
In fact, this phenomenon is easy to understand. Obviously, there is something wrong with the phase shifter or the knob of the speaker to adjust the volume. Most speakers use the speaker adjuster button to change the signal strength (except the digital tuning speaker adjuster button), thereby adjusting the volume and bass. The speaker regulator button changes its position on the carbon resistor through the movable contact, thus changing the resistance value. With the increase of use time, dust or impurities will fall into the keys of the speaker regulator, and the contacts of the keys of the speaker regulator may also be oxidized and rusted, resulting in accidental contact. There will be noise when adjusting the volume at this time.
Maintenance method: Just replace a new speaker adjustment button at this time, and the new speaker adjustment button is not expensive, basically only a few dollars. You can also do a simple treatment to see if it is feasible, that is, turn on the speaker, and then turn on the four crimping pieces behind the speaker adjustment button to expose the movable contact of the speaker adjustment button. Then, clean the carbon resistor with anhydrous alcohol, drop a drop of oil on the carbon resistor, and finally install the speaker adjustment button in the original position to solve the noise problem.
Fourth, the sound is only high-pitched, not low-pitched.
Fault phenomenon: there is sound, but only high notes, no bass.
This kind of failure is generally due to the loud volume of the speaker, long use time and the burnt-out subwoofer. This is normal. Friends who like bass think that the louder the volume, the better. Some friends can even turn it up very high and turn it up to over 70%, which is the easiest way to burn bass. It is usually recommended to choose 30%-50% volume and 30%-40% bass.
Maintenance method: the subwoofer is burnt out, replace the hardware and find a professional maintenance master. In addition, this situation may also be that the thread is broken. In this case, just spend money to replace a new thread.
Fifth, the speaker sound is not clear.
Fault phenomenon: there is sound, but the sound is not clear, and the specific content can not be heard clearly.
In addition to the damage of the tweeter, this fault may also be caused by the broken signal line of the tweeter amplifier or the damage of the integrated block. In addition, it should be noted that if you use a sound card, sometimes you will inadvertently change the settings, so that the speaker's pronunciation can only be heard clearly by the female voice, but not by the male voice.
Maintenance method: the tweeter is damaged, so we can only find a professional sound repairman to replace the hardware. Secondly, if you use a sound card and accidentally change the settings, please adjust the sound card.
The maintenance method of speaker 1 and the debugging of new machine should be cautious.
When many people buy new stereos, they can't help but get excited and try to plug them in. You must pay attention that the tester will directly impact the circuit of the amplifier when the speaker is not connected to the amplifier. Audio is a passive device, and all the energy comes from the output of the power amplifier. If the power supply is connected before this road is connected, the amplifier will be guilty. It's the power amplifier that loses when you turn it on, and the ear that loses when you listen to music in the future. So be sure to check whether all the devices are connected properly when starting up, and then turn the volume knob to the minimum before starting up. If the system makes abnormal noise, it is best to turn off the power and ask professionals to debug it. Generally, it is not recommended for players to start the diagnosis themselves, otherwise the hardware performance will be affected.
2. Try to use it at a reasonable ambient temperature.
The ambient temperature of the sound should be controlled at least between-10℃ and 40℃, and the temperature environment should avoid large fluctuations as far as possible. Excessive temperature changes and the use of audio in extremely low and high environments will cause irreversible damage to the audio system.
3. Pay attention to the environmental humidity
As far as environmental humidity is concerned, audio should be placed between 50% and 80% of relative humidity. Too humid environment will lead to premature failure of components in the machine or rust inside and outside the machine.
4, pay attention to the voltage frequency
The voltage and frequency of power supply should be consistent with local power. Operating the audio for a long time under the condition of power supply with non-rated voltage and frequency will accelerate the aging of the audio.
5. Avoid excessive dust environment and excessive vibration.
Acoustics, in addition to avoiding direct sunlight and heavy pressure, should first avoid dusty environment and vibration environment under the condition of placing space. In audio system, especially power amplifier is very sensitive to environmental dust. Because of the need of heat dissipation, each power amplifier will have heat dissipation holes. Excessive dust will not only close the cooling hole, but also cause damage to specific circuits after entering the body. In addition, whether it is a power amplifier or a speaker, there should be enough space around it, especially don't pile other equipment on the power amplifier.
6, pay attention to the equipment switching order
Audio, like computers, has the problem of switching order of devices. When using audio, the first thing to start is the signal source equipment. Usually, in addition to the power amplifier, we also choose audio equipment such as disc player. In the process of starting several devices one after another, special attention should be paid to the sequence of starting and closing. When starting the machine, you should first start the front equipment such as audio source such as disc player, and then turn on the power amplifier; When shutting down, turn off the power amplifier first, and then turn off the front-end equipment. Turn the volume of the stereo to a minimum when you turn it off, so as to reduce the impact on the stereo when you turn it off and not scare yourself when you turn it on next time.
7. Pay attention to professionalism.
Many power amplifiers, such as Yamaha DSP-Z9, have one or two sockets for other devices on the back. This socket must be dedicated to other high-power equipment, such as irons and other household appliances. Whether it is the socket behind the power amplifier or the plug of the power amplifier itself, it will impact the system and damage the fuselage and speaker during use.
8. Do not use water for cleaning.