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例1 开机“三无”。原因:C_(711)(100μF/25V)电解电容漏电变质、IC_(701)②脚得不到正确的取样电压,测110V 稳压管 D_(705)击穿短路。关键点:断开 D_(705)测主电源电压由110V 上升至200V 以上。例2 光栅亮度和幅度闪烁变化.原因:300V 滤波电容 C_(706)失效.关键点:C_(706)两端电压低于230V。例3 光栅闪烁,有“吱、吱”叫声。
Example 1 boot “three noes.” Reason: C_ (711) (100μF / 25V) electrolytic capacitor leakage deterioration, IC_ (701) ② feet can not get the correct sampling voltage, measuring 110V regulator D_ (705) breakdown short circuit. The key point: disconnect the D_ (705) measured the main power supply voltage from 110V to 200V above. Example 2 Flicker brightness and amplitude changes Cause: 300V filter capacitor C_ (706) failure Key points: C_ (706) the voltage across the 230V. Example 3 grating flashing, “squeak, squeak” sounds.