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二、无光栅、无伴音、电源指示灯亮1.故障原因与检修流程该故障说明开关电源和5V供电正常,主要是由于微处理器未工作或待机控制电路异常所致。若开机瞬间正常,而后进入待机状态,多为保护电路动作,该故障的检修流程如图2所示。2.检修方法与技巧由于该机的副电源电路的待机控制采用了继电
Second, no grating, no sound, light power indicator 1. Failure causes and maintenance process The fault description switching power supply and 5V power supply is normal, mainly due to the microprocessor is not working or standby control circuit abnormalities caused. If the boot instantly normal, and then enter the standby state, mostly to protect the circuit action, the fault repair process shown in Figure 2. 2. Maintenance methods and techniques As the machine’s secondary power circuit standby control relay