Speaker failure analysis 

Time:2013-11-28 | Read:679 | Posted: Site Editor
Speaker system is one of the important part of audio equipment, usually by the speaker, frequency divider, enclosure, sound-absorbing materials, etc. Speaker system failure rate is low, fault type, less common faults have the following four categories. 
1. The speaker wire is broken or abnormal frequency divider. Speaker wiring after fracture, the speaker unit without excitation voltage, will result in silent failure. Divider is not easy to break, but possible joint sealing off, frequency division lead capacitance short circuit fault, etc. 
2. The voice coil is broken. Available multimeter R x 1 gear measuring speaker lead wire welding, if resistance is up, use a knife to the voice coil two ends of lead sealing paint scraping, measured again after exposing bare copper wire, if still not, is the voice coil internal bolt; If measuring up and has a sound "raise price", suggests that voice coil wire break, thread can be for solder, and the other with a close to voice coil winding of the enameled wire welding can be completed. 
3. The speaker wire is broken. Due to the loudspeaker paper cone vibration frequency, the braided wire is easy broken, sometimes wire is broken, but cotton core is still keep connection. The braided wire is not easy to buy, can use soft wire instead of longer. 
4. The voice coil burned. The speaker wire is measured with a multimeter R x 1 ", if the resistance is close to 0 Ω, and no "raise price" sound, suggests that voice coil burned. Before you replace the voice coil, should remove impurities in the magnetic gap, and then carefully put new voice coil in the magnetic gap, rotary's pronunciation, listening while with super glue and fixed position of the voice coil and, after waiting for voice coil placed in the best position, use super glue to fill the clearance between the paper cone and voice coil to about half, finally sealed dust cover, the loudspeaker paper cone up, place a day after can be normal use.