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典型的电源电路原理图如图3所示。3.功率放大电路故障从上述分析可知,功率放大输出端不正常,就会引起扬声器保护电路动作。造成功放输出端不正常的原因很多,一是因为功放正、负电源电压不对称,如正、负电源电路某一滤波电容失效、漏电,桥式整流管某一臂二极管性能变差等。检修时可用万用表测量功放正、负电源的电压值是否相等。
Typical power circuit diagram shown in Figure 3. 3 power amplifier circuit fault From the above analysis we can see that the power amplifier output is not normal, it will cause the speaker protection circuit. Power amplifier output is not normal for many reasons, first, because the amplifier positive and negative power supply voltage asymmetry, such as positive and negative power supply circuit, a filter capacitor failure, leakage, bridge rectifier diode arm performance deterioration. Maintenance can be used to measure multimeter amp positive and negative power supply voltage values are equal.