How to troubleshoot false car audio faults

1. False failure of the CD player

After using the CD player for one or two years, car owners generally report that the CD player does not read the disk or the ability to read the disk is not as good as before, that is, the listening ability was not as good as before. It's a good CD, but now I can't listen to it, or I can only listen intermittently. Some people can hear it on other people's machines, but not on their own machine. In fact, this is also a normal phenomenon and a false fault. Because the disk cannot be read or the ability to read the disk is poor, it is mostly caused by dust on the lens of the optical head. You can completely troubleshoot the problem by yourself. The specific method is: remove the cover after powering off, dip a cotton ball in clean water, and gently wipe off the dust on the lens of the bald head. After cleaning the bald head, the disk reading ability will be greatly improved. Also, don’t trust the CD cleaning disk too much, because a car owner used it before, but it didn’t work. When he went to a repair station to help him replace the bald head, he thought that after cleaning the cleaning disk, the situation should improve. In fact, it was not the case. After the maintenance station turned on the machine and observed it in person, the owner's CD player's optical lens was not cleaned. After cleaning it according to the above method, the CD playback was normal.

Therefore, we suggest car owners that if your car has a CD player, it is best not to use the CD cleaning tray, because the CD player in the car is moved in and out by two rubber rollers, which are clamped and rolled in and out easily. It will cause the cleaning plate brush to deform and fall off, so do not use it. In addition, I would like to remind everyone that ordinary CD players cannot play DVDs, SVCDs on the market. This is not because the machine is faulty, but because the decoding format and signal compression ratio of the film source are different. The DVD players currently on the market are compatible with VCD and CD discs, that is, they are only backward compatible. So when you get the disc, you must clearly see whether it is a CD, VCD, SVCD, DVCD or DVD to avoid a false alarm. Make jokes. Some cars use multi-butterfly CD drives. The way to place CD records is different from the usual ones. They put the side with the audio track upwards. If it is downwards, the disc will not be read. Check the upper part of the CD compartment before use. There are instructions.

2. Power failure

1. If the radio is listening normally, but suddenly there is no sound or display, it means that the power supply is not supplying power. Generally, look for the radio fuse (most car radio cigarette lighters and ceiling lights use the same fuse, which is caused by an internal short circuit in the cigarette lighter when using the cigarette lighter. blown fuse). Just replace it with new insurance.

2. If it is a sound system with a power amplifier installed, and the host has power and is working normally, then mainly check the main power fuse of the power amplifier (because the main power fuse is connected to the positive terminal of the battery pile head, it is easy to oxidize and corrode, causing poor contact or open circuit), and connect it properly That’s it.

3. If the radio part does not have the previous radio station memory storage and clock memory when it is turned off and then turned on again, this may be because the fuse of the bat (battery wire) line is blown or not connected properly. This line is used to power the memory storage, so it must be connected properly. .

3. Use of reset button

1. For some hosts, such as the Kenwood krc970 series, the radio format will change when the power is turned on immediately after a power outage. To restore the original radio format, press the reset button to restore. If it cannot be restored, disconnect the power cord and wait for 3 minutes. Then connect it again to restore the original radio format.

2. For models such as sonyxr-c5200 and Press the reset button for more than 2 seconds, install the panel and start the machine to work.

3. When the Kenwood KRC487 tape is played, it cannot operate normally even when the button is pressed. This is a microprocessor failure. The troubleshooting method is to press the reset button on the front panel to solve the problem.

4. The Kenwood film changer displays normal playback but no sound. This is because the microprocessor is not functioning properly. Troubleshooting Pressing the device's reset button will resolve the issue.

5. Advanced consoles with track programming sometimes cause errors or crashes due to incorrect operations. In this case, just use the reset button to clear the error memory.

6. Old models of Avawa or Sony may find that the CD cannot be played. At this time, find the reset button on the host and hold it for 2 seconds. You will hear a reset action inside the machine. It should be able to work normally. If it still cannot work, please ask a professional technician to repair it. .

4. Use of volume balance

Due to the small area of ??the car audio panel, it is impossible to design too many buttons. In this way, when there are many functions, one button It is responsible for the operation of multiple functions. When the volume balance is improperly adjusted or the operation is incorrect, there will often be a problem where one of the left, right or front speakers does not sound, or even only one speaker sounds. Many car owners often think that there is a problem with the speaker itself or the wiring. . If you encounter this problem, it is recommended to refer to the user manual and adjust the volume balance button until the volume is balanced.

5. Repeat playback function

Sometimes the repeat playback button is accidentally touched during use. For example, the Sony machine repeatedly plays a track (rep-1) or repeatedly The situation of playing a record (rep-2). Some car owners think that the CD player has malfunctioned and require repair. In fact, this is a normal phenomenon of the machine. It is just that the car owner did not read the instruction manual carefully and did not understand this function. To return to normal play mode, just press the ‘shift’ key, then press 3 (playmood) repeatedly to select ‘rep-off’.

6. How to turn off the display completely

There are many models of ignition switches that do not have the ‘acc’ position, which means that the audio is not controlled by the ignition switch. For example, the clock on the Sony machine panel is still displayed after turning off the audio, which consumes power and accelerates the aging of the audio display. The solution is: there is an a/b switch at the bottom of the Sony machine, which can be selected, or there is a reset button to switch. You can refer to the instruction manual for operation.

Press the off button when the sony xr-5600 is turned off. When you press it, the machine stops working, but the clock is still displayed. If you want to completely turn it off, just hold the off button for more than 3 seconds. If there is no such function, another switch to control 'acc' must be added.

7. Poor radio reception

When encountering poor radio reception, first check whether the host is normal, then focus on checking the antenna, and use the 'ω' switch of the multimeter to check whether there is a short circuit , open circuit and grounding occur or the resistance increases. If the radio reception effect is not good after replacing a new speaker, it may be due to improper handling of the replacement antenna, such as window antenna, electronic antenna, integrated antenna, etc., which require special processing before normal reception can be achieved, so You must know how to modify it, otherwise it will affect listening.

8. Audio protection circuit

A 'Passat' car owner came to repair the audio. He said: 'When using the audio, the fault often occurs that the sound does not sound after vibration, and sometimes the car door cannot be closed. A staccato sound will occur. ’ After checking that the host is normal, look for the wiring on the car. According to the clues provided by the car owner, when checking the right rear door, it was found that there was a short circuit point in the speaker wire to ground. After that was eliminated, the audio worked normally. Why does one speaker have a short-circuit point and all the speakers do not sound? This is because the speaker has an output short-circuit protection circuit. If it does not, the amplifier circuit will be burned.

9. Some frequencies are not displayed

When listening to the FM radio station (Beijing fm91.5), the frequency is not displayed, but the listening is normal. This is not because there is a problem with the speakers. This type of model has the RDS function. RDS has not been enabled in our country, but has been enabled in developed countries, especially in Europe. Therefore, no display will occur when receiving this signal. The solution is to turn off the RDS function. That’s it.