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合上电源开关 S501,机前红色发光管不亮,查交流回路保险管 F501是否熔断:F501熔断,一般是主电源开关管 V501击穿(也不排除 N502内开关管击穿,VD501和 C509击穿漏电)。V501击穿,一定要查清损坏原因(如:T501⑥～⑨绕组是否局部短路,相关保护功能是否失效等),更换所有失效元件再试机。F501完好,按遥控“POWER”键,红色发光管仍不能点亮,说明故障在副开关电源。查 N502⑤脚的直流工作电压,①脚的5.8V 直流电压,这两个电压正常,
Close the power switch S501, the front of the red LED is off, check the AC fuse circuit fuse F501 is blown: F501 fuse, usually the main power switch tube V501 breakdown (also does not rule out the N502 switch tube breakdown, VD501 and C509 hit Wear leakage). V501 breakdown, be sure to find out the cause of the damage (such as: T501 ⑥ ~ ⑨ winding is a partial short circuit, the relevant protection function is invalid, etc.), replace all failed components and then test machine. F501 intact, press the remote control “POWER” button, the red LED still can not light, indicating the fault in the sub-switch power supply. Check N502 ⑤ feet DC operating voltage, ① foot 5.8V DC voltage, the two voltage is normal,