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本人曾接修一台带机芯的环绕声扩音机。该用户反映:此机新买不久,不常使用,当天早上开机不到十分钟,发现机内冒烟,同时看到电压表上的读数为230V左右,就马上关机。开机一看,发现一滤波电容(2200μF/16V)已烧焦。该机功放部采用正负电源供电。经过检查,电路其他部分没有问题,于是换上同规格的电容后,一开机,一切正常。但几分钟后,听“啪”的一声,新换上的电容已爆裂。开始还以为市电电压高,
I have taken over a movement with a surround sound amplifier. The user reflects: This machine newly purchased soon, not often used, the morning boot less than ten minutes and found smoke inside the machine, while reading the voltmeter on the 230V or so, immediately shut down. Boot a look and found a filter capacitor (2200μF / 16V) has been burned. Power amplifier unit using positive and negative power supply. After examination, the circuit is no problem with other parts, so put on the same specifications of the capacitor, a boot, everything is normal. But a few minutes later, listening to “pop” soon, the new capacitor has been burst. The beginning of the city that high voltage,