What should I do if the sound system fails?

People who don't understand electronic technology can only find a master to repair it.

When the speaker sound of the sound system is abnormal, it can be solved with the following methods.

1. It is generally impossible for the speaker to burn out all the units of high, medium and bass at once, so if the sound is silent, please check whether there is a problem with VOD, pre-amp and power amplifier, and then check the speaker after confirmation.

2. The speaker emits an abnormal sound of "Bubu".

Disassemble the box net, check whether the box is leaking, and whether the unit is installed firmly on the box (sometimes the unit is not installed firmly, and the iron edge of the unit collides with the box during the use of high power and dynamics, and the strange sound of air leakage will also be emitted), if each unit is installed firmly, listen carefully to determine which unit the abnormal sound comes from.

Remove the unit with abnormal sound, place the unit flat on the ground, and check whether the edge of the bubble is broken and degummed, and whether the dust cap is degummed (usually the sound of "Bubu" is related to the above reasons). If there is no degumming and leakage, use the right finger to make a triangular balance and naturally push down the paper tray of the unit (when the normal unit is pushed down, there should be no noise, and the unit due to edge rubbing, voice coil deformation, etc. will emit abnormal noise.) )

If the unit is not installed firmly and makes noise, it can be reinstalled firmly, if the unit is degummed and leaking from the puff edge or dust cap, it can be sealed with agricultural machinery glue (glue used for roadside leather shoes) and not naturally air-dried.

Check whether there is no foam glue buffer strip at the contact point between the speaker mesh and the cabinet, and if not, add adhesive strips to remove the noise.

If the speaker unit burns out, it should be returned to the manufacturer for repair, because the voice coil and paper cone will affect the timbre, if the original voice coil and paper cone are not used, the tone of the horn will change.

1. Poor contact of speaker leads. It is usually caused by mildew or poor welding of the voice coil lead, and when the paper cone vibrates frequently, the break point is sometimes connected and sometimes disconnected, forming an irregular sound and no sound fault.

2. The voice coil lead wire is broken or about to be short-circuited.

3. The power amplifier output socket is in poor contact or the speaker input line is disconnected.

The speaker performance is poor, and the magnetism of the magnet decreases

The sensitivity of the speaker depends mainly on the magnetism of the permanent magnet, the quality of the paper cone and the quality of the assembly process. You can use a ferromagnetic object to touch the magnet, and roughly estimate the strength of the magnetism according to the size of the force of attraction, if the magnetism is too weak, you can only replace the horn.

The magnetic core column is loose

When the magnetic core column of the speaker is loose, it will be drawn to the side by the magnetic guide plate, causing the voice coil to be squeezed and hindering normal sound production. If you can't press it, it may be that the voice coil is pressed by the core column, and it needs to be disassembled and re-cemented before it can be restored.

The divider is abnormal

When there is a defective component in the crossover, the signal of the corresponding frequency band is blocked, and the speaker in that frequency band has a volume glitch. It should be important to check whether the crossover capacitor in parallel with the woofer is short-circuited, and whether the crossover inductance coil in parallel with the tweeter is short-circuited between layers.

The speaker wiring is broken or the crossover is abnormal

When the speaker wiring is broken, the speaker unit does not have an excitation voltage, which will cause a silent failure. Frequency dividers are generally not easy to break, but failures such as desoldering of lead joints and short circuits of crossover capacitors may occur.

The voice coil is broken

You can use the multimeter R 1 gear to measure the solder lug of the speaker lead-out wire, if the resistance value is , you can use a knife to scrape the sealing paint of the lead wire at both ends of the voice coil, expose the bare copper wire and then test, if it is still not through, it means that the internal wire of the voice coil is broken; If the measurement has been passed and there is"Titicaca"sound, it indicates that the voice coil lead is broken, you can solder the thread well, and then use another piece of enameled wire similar to the voice coil winding to solder it.

The horn lead is broken

Due to the frequent vibration of the speaker cone, the braided wire is prone to breakage, and sometimes the wire is broken, but the cotton core wire remains connected. This braided wire is not readily available and can be replaced with a slightly longer flexible wireThe speaker lead wire is broken, due to the frequent vibration of the speaker paper cone, the braided wire is easy to break, sometimes the wire is broken, but the cotton core wire is still connected.

This braided wire is not readily available and can be replaced with a slightly longer flexible wire

The voice coil burned

Measure the speaker leads with the multimeter R 1 if the resistance value is close to 0 and there is none"Titicaca"sound, it indicates that the voice coil is burned. Before replacing the voice coil, you should first remove the debris in the magnetic gap, and then carefully put the new voice coil into the magnetic gap, straighten the voice coil, fix the upper and lower positions of the voice coil with super glue while listening, and after the voice coil is placed in the best position, fill the gap between the voice coil and the paper cone to about half with super glue, and finally seal the dust cover, turn the speaker paper cone up, and place it for a day before normal use.

There is debris in the magnetic gap

If debris enters the magnetic gap, the voice coil will rub against the debris when it vibrates, resulting in a hoarse voice.

Voice coil rubbing

The position of the voice coil is not correct, and the magnetic core collides, resulting in sound distortion, the position of the voice coil should be corrected or replaced during maintenance.

The paper cone is broken

The paper cone should be replaced if the damage area is large, and the paper cone with a small damage area can be repaired with a slightly thinner paper cone or other paper with good toughness.

Poor cabinet