With the development of science and technology and industry, car audio is constantly updated and added many new functions, especially high-end machines with complete functions, but the operation is more complicated, which brings many difficulties and troubles to installation and use. Sometimes due to incorrect operation or a certain switch and button, false faults or abnormal conditions are generated. The so-called false fault is that there is no problem with the audio itself, but the fault occurs due to improper use.

Don't panic when there is a malfunction, and don't blindly draw conclusions. You should calm down and read the product manual carefully, find out the reason according to the operating procedures, or call the relevant repair station or expert, which may be helpful. This way you can run less and reduce unnecessary maintenance or inspection costs. Below we introduce a few typical examples based on some situations encountered during maintenance.

1. False failure of CD player

After using the CD player for a year or two, car owners generally report that the CD player does not read the disk or the reading capacity is not as good as before, that is, the CDs that have been well-read before can no longer be listened to, or can be heard intermittently. Some people can listen on other people's machines, but not on their own machines. In fact, this is also a normal phenomenon and a false fault. Most of them are caused by dust on the lens of the optical head because they do not read the disk or have poor reading ability. The specific method is: remove the cover after power off, use a cotton ball dipped in clean water, and gently wipe off the dust on the lens of the optical head. After cleaning the optical head, the reading ability of the disk will be greatly improved. Also, do n’t believe the CD cleaning disc too much, because a car owner has used it before and it does n’t work. When he found a repair station to help change the bald head, he thought that after cleaning the disc, the situation should be better, but it ’s not. After the face-to-face observation of the maintenance station, the optical head lens of the owner's CD machine was not cleaned, and then the CD playback was normal after cleaning according to the above method.

Therefore, we recommend the car owner and friends. If your car has a CD player, it is best not to use CD cleaning discs, because the CD discs in and out of the car rely on the upper and lower rubber rollers to clamp the rolling in and out, which is easy to deform the cleaning disc brush and Shedding, so do not use. In addition, everyone is reminded that ordinary DVD players cannot play DVDs and SVCDs on the market. This is not a problem with the machine, but the decoding format and signal compression ratio of the film source are different. Current DVD players on the market are compatible with VCD and CD discs, that is, only backward compatible, so when you get the disc, you must see whether it is a CD, VCD, SVCD, DVCD or DVD to avoid false alarm. Make a joke. Some vehicles use multi-butterfly CD drives. The method of placing CD records is different from the usual one. They are facing upward with the audio track. If they are down, they will not read the disc. Look at the upper part of the CD magazine before using it. Have instructions.

2. Power failure

1. If the radio is normally listening normally, there is no sound and display suddenly, indicating that the power supply is not powered. In general, look for the radio insurance (most car radio cigarette lighters and ceiling lights use the same insurance. Because the cigarette lighter is used inside Short circuit causes burnout insurance). Replace with new insurance.

2. If the audio system is equipped with a power amplifier, and the host is powered and working normally, then the main power insurance of the power amplifier is mainly checked (because the main power insurance is connected to the positive end of the battery pile head, it is easy to be oxidized and corroded to cause poor contact or open circuit), Just pick it up.

3. If the radio part does not have the previous radio memory storage and clock memory after the power is turned off, it may be because the BAT (BatterYWire) line is burnt out or not connected. This line is used to power the memory storage, so it must be connected. it is good.

3. Use of reset button

1. Some hosts, such as Jianwu KRC970 series products, will turn on the radio system immediately after the power is turned off. To restore the original radio system, you can press the reset button to restore. If you cannot restore it, disconnect the power cord and wait Reconnect it after 3 minutes, you can restore the original radio format

2. SONYXR-C5200, XR6200 and other models sometimes have no response after installation, which means that they can not work, some people think that the host is broken, in fact, if the host cable is not wrong, just remove the panel and press The reset button at the lower left for more than 2 seconds, the panel can be installed and turned on to work.

3. When playing the Jianwu KRC487 tape, the button does not work normally when it is pressed. This is a malfunction of the microprocessor. The troubleshooting method is to solve the problem by pressing the reset button on the front panel.

4. The Kenwood changer shows normal playback but no sound. This is because the microprocessor is not operating normally. Remedy Press the reset button of the device to solve the problem.

5. The advanced host with track programming sometimes causes errors or crashes due to incorrect operation. At this time, use the reset button to clear the error memory.

6. Old models of Aihua or Sony may appear that the CD cannot be played. At this time, find the reset button on the host, press and hold for 2 seconds to hear the reset action inside the machine, then it should work normally, if you still can't work, please ask professional technology Personnel maintenance.

Fourth, the 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, in the case of multiple functions, a button must be responsible for the operation of multiple functions. It will often appear when the volume balance is improperly adjusted or the operation is wrong. There is a problem that there is no sound on one side of the left or right, or even one speaker, and many car owners often think that there is a problem with the sound itself or the line. If you encounter this kind of problem, it is recommended to adjust the volume balance button according to the instruction manual until it reaches the volume balance.

5. Repeated playback function

Sometimes I didn't pay attention to it during use and touched the repeat play button. For example, Sony may play a track (REP-1) repeatedly or a record (REP-2) repeatedly. Some car owners think that the CD machine is faulty and require repair. In fact, this is a normal phenomenon of the machine. It is just that the car owner has not carefully read the instruction manual and does not understand this function. To return to normal playback 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 where the ignition switch does not have "ACC" gear, which means that the sound is not controlled by the ignition switch. If the clock of the SONY machine panel is still displayed after the sound is turned off, it will consume power and accelerate the aging of the sound display. The solution is: there is an A / B switch on the bottom of the SONY machine, which can be selected, and it can also be converted with the reset button. You can refer to the operation manual for operation.

When the SONYXR-5600 is turned off, press the OFF button. When pressed, the machine stops working, but the clock still shows. If you want to completely turn off the ammonium, hold the OFF button for more than 3 seconds. If there is no such function, an additional switch to control "ACC" is required.

7. Poor radio performance

When the radio reception effect is not good, first check whether the host is normal, then focus on checking the antenna, use a multimeter "Ω" block to check whether there is a short circuit, open circuit and grounding or the resistance value increases. If the radio reception effect is not good after changing the new audio, it may be because of improper handling of the replacement antenna, such as window antenna, electronic antenna and integrated antenna, etc., only after special treatment can normal reception, so The modification method must be clear, otherwise it will affect the listening.

8. Audio protection circuit

A "Passat" owner came to repair the audio. He said: "When using the audio, there is often a failure that does not sound after vibration, and sometimes the door will also be broken." After checking the host is normal, you should find the line on the car. According to the clues provided by the owner, when checking the right rear door, it was found that the speaker wire had a short-circuit point to the ground, and after removing the sound, the sound worked normally. Why does one speaker have a short circuit and all the speakers are not ringing? This is because the audio is equipped with an output short-circuit protection circuit, and if not, it will burn the amplifier circuit.

Nine, no frequency display

When listening to the FM radio station (Beijing FM91.5), the frequency is not displayed, but listening is normal, this is not a problem with the sound, because this type of model has RDS function, RDS has not yet been opened in China, and has been opened in developed countries. Especially in Europe, it has been widely used, so when receiving this signal, there will be no display, the solution is to turn off the RDS function.

The above example shows that when the sound fails, don't blindly conclude that the sound is broken. After careful analysis, it is indeed a problem and then sent to the maintenance department for repair. In this way, many unnecessary troubles can be reduced.

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