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故障现象:开机呈“三无”,但有“吱吱”声,电源指示灯不亮。分析与检修:该机开关电源电路采用STR-S6309型电源厚膜块,属于自激并联输出型电路。取样稳压控制电路采用直接取样(直接取自140V输出电压)、光电耦合器隔离控制方式,主要由三端稳压块IC602、光电耦合器IC603(TLP621)和Q621等电路组成。开关电源电路的遥控开/关机,由微处理器IC001(CTV222 S·PRC)(41)脚(遥控开/关机控制端)及驱动接口电
Symptom: boot was “three noes”, but “creak” sound, the power light does not light. Analysis and Maintenance: The machine switch power supply circuit using STR-S6309-type power thick film block, belonging to the self-excited parallel output type circuit. Sampling regulator control circuit using direct sampling (directly from the 140V output voltage), optocoupler isolation control, mainly by the three-terminal regulator block IC602, optocoupler IC603 (TLP621) and Q621 and other circuits. Switch power circuit remote control on / off, the microprocessor IC001 (CTV222 S · PRC) (41) feet (remote on / off control) and the driver interface