Speaker system is one of the important parts of audio equipment, which is usually composed of loudspeaker, frequency divider, box, sound absorbing materials, etc. The failure rate of the speaker system is low, and the common failures with small types are as follows:

1、 Silent

1. The speaker wiring is broken or the frequency divider is abnormal. After the speaker wiring is broken, the speaker unit has no excitation voltage, which will cause a silent fault. The divider is generally not easy to break, but it may have lead joint desoldering, frequency divider capacitor short circuit and other faults.

2. The voice coil is broken. Use the multimeter RX1 gear to measure the speaker lead out lug. If the resistance value is ∞, use a knife to scrape off the sealing paint of the leads at both ends of the voice coil. After the copper wire is exposed, measure again. If it is different, it indicates that the voice coil is broken internally; If the measurement is turned on and there is a "click" sound, it indicates that the voice coil lead is open circuit. You can solder the wire head and then use another section of enamelled wire close to the voice coil winding wire to solder it.

3. The speaker lead is broken. As the loudspeaker paper tray vibrates frequently, the braided wire is easy to break, sometimes the wire is broken, but the cotton core wire remains connected. This kind of braided wire is not easy to purchase and can be replaced by a slightly longer flexible wire.

4. The voice coil is burnt. Measure the loudspeaker lead with the multimeter RX1 gear. If the resistance is close to 0 Ω and there is no "click" sound, it indicates that the voice coil is burnt. Before replacing the voice coil, the sundries in the magnetic gap shall be removed first, then the new voice coil shall be carefully placed in the magnetic gap, the voice coil shall be righted, and the upper and lower positions of the voice coil shall be fixed with super glue while listening. After the voice coil is in the best position, the gap between the voice coil and the paper tray shall be filled to about half with super glue, the dust cover shall be sealed, the speaker paper tray shall be upward, and it can be used normally after being placed for one day.

2、 Sometimes no sound

1. The speaker lead is in poor contact. It is usually caused by moldy break of voice coil lead or poor welding. When the paper tray vibrates frequently, the power is turned on and off occasionally, resulting in the failure of irregular ringing and no ringing.

2. The voice coil lead is broken or will be short circuited.

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