论文部分内容阅读
故障现象：机器不定标。检修分析：参阅下图，机器处于１ｍＶ定标状态时，ＳＷ２０４的１，２端相联接地。经过Ｒ２１２Ｃ２０３、Ｒ２１３给ＩＣ２０３的１１脚加低电平“０”，ＩＣ２０３的１０脚输出高电平“１”由于ＩＣ２０３的１０脚与ＩＣ２１５的５脚短接，故ＩＣ２１
Symptom: The machine is not calibrated. Maintenance analysis: Refer to the figure below. When the machine is in the 1mV calibration state, the SW204 terminals 1 and 2 are connected to each other. After R212C203 and R213 add low level “0” to IC203’s 11th pin, IC203’s 10 pin output high level “1”. Because IC203’s 10 pin is shorted to IC215’s pin 5, IC21