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3.开机后自动关机37HU电源板在主开关电源的“一次”和“二次”侧设有过电压、欠电压保护电路,当开关电源发生过电压、欠电压故障时,多会引起保护电路启动,进入保护状态,开关电源停止工作,看不到真实的故障现象,给维修造成困难。如果开机的瞬间有电压输出,然后输出电压降为0V,说明主开关电源保护电路启动,重点检查电源“一次”侧N503的⑥脚和⑦脚外部的欠电压、过电压保护电路;检查由D518、V507组成的过电压保护电路。
3. Power off automatically after power 37HU power supply board in the main switch power supply “once ” and “secondary ” side with over voltage, under voltage protection circuit, when the switching power supply over voltage, under voltage fault, and more Will cause the protection circuit to start, enter the protection state, switch the power to stop working, can not see the real fault phenomenon, causing difficulties to the maintenance. If there is a voltage output when the power is turned on, then the output voltage drops to 0V, indicating the main switch power protection circuit is activated, focusing on the power supply “a ” N503’s ⑥ feet and ⑦ feet undervoltage, overvoltage protection circuit; check By D518, V507 consisting of over-voltage protection circuit.