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据分析,“OV”控制(线)电压异常原因有三:一是微处理器(M34300N4—012SP)工作不正常(如:CPU 正常工作必备三个条件:+5V 供电电压、复位电平、时钟振荡信号等有异常而不能满足条件要求,或 CPU 本身不良或损坏);二是接口电路 V603、V606有故障;三是继电器 RLY901有问题等。经检查,发现+5V 电压正常;用示波器测 CPU⑦脚复位电平亦有低到高的变化;监测 CPU(34)、(35)脚时钟
According to the analysis, “OV” control (line) voltage anomalies for three reasons: First, the microprocessor (M34300N4-012SP) is not working properly (such as: CPU normal work must have three conditions: +5 V supply voltage, reset level, Oscillation signals and other abnormalities can not meet the requirements, or CPU itself is bad or damaged); second interface circuit V603, V606 fault; third is the relay RLY901 problems. After examination, found +5 V voltage is normal; with the oscilloscope measured CPU pin reset level also has low to high changes; monitoring CPU (34), (35) pin clock