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1.首先测CPU工作条件是否具备,也就是常说的四个条件(工作电压、CPU振荡、复位电平、键扫电路)都正常;2.测SDA、SCL供电电压是否正常;3.若有总线ON/OFF控制端应查其电压是否正常;4.测CPU总线各端口电压,看总线系统是否正常。正常为高电平有且微抖现象。怎样检修I~2C总线故障彩
1 first measure the CPU working conditions are available, which is often said that the four conditions (working voltage, CPU oscillation, reset level, key scan circuit) are normal; 2 measured SDA, SCL supply voltage is normal; A bus ON / OFF control terminal should check the voltage is normal; 4. Measure the CPU bus port voltage to see whether the bus system is normal. Normally high and slightly shaking phenomenon. How to repair I ~ 2C bus fault color