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例1开机电源发出“叽叽”叫声,输出不稳定。分析与检修:测量开关电源输出的电压低于正常值,故障在开关电源“一次”电路或稳压环路。多为稳压电路元器件变质、④脚供电低有关。对稳压环路的取样误差放大电路元器件进行检查,未见异常;对IC601各脚电压进行测量,发现IC601的④脚电压较正常值电压低,经查系④脚VCC“二次”供
Example 1 boot power issue “Jiji ” sound, the output is unstable. Analysis and Maintenance: Measure the output voltage of the switching power supply is lower than the normal value, the fault is in the switching power supply “one time ” circuit or the voltage regulation loop. Mostly for the deterioration of circuit components, ④ feet low power supply. Check the voltage loop sampling error amplifier circuit components, no abnormalities; IC601 foot voltage measurement, IC601 found that the foot voltage is lower than the normal voltage, the Department of investigation ④ feet VCC "for