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故障现象:冷开机半小时左右后自动关机,电源指示灯也不亮。随后又开机,正常工作时间越来越短,有时几分钟后会“自动关机”。检修过程:“自动关机”后,电源指示灯不亮,表明电源部分已强迫停振。该机遥控关机后电源指示灯会亮,说明两者关机则不同。该机电源电路是以 IC901(STR—S6708)为核心组成的他激式并联型开关电源。稳压、待机控制、各种保护控制等均由分立元件组成。保护电路很多且完善。
Symptom: cold boot about half an hour after the shutdown, the power indicator is not bright. Then boot again, shorter and shorter normal working hours, sometimes after a few minutes “Auto Power Off ”. Maintenance process: “Auto power off ”, the power indicator light does not shine, indicating that the power part of the force has been forced to stop vibration. After the remote control power off the power indicator light, indicating that the two are different off. The machine power circuit is based on IC901 (STR-S6708) as the core of his exciting parallel switching power supply. Regulators, standby control, a variety of protection and control by the discrete components. Protection circuit is many and perfect.