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现象开机后LCD显示正常,而按下自动键盘(AVTO KEYBOARD)上任何一个功能键,仪器均不能按所选择的功能工作。分析 EDG6151键盘上的十个功能键通过一个编码器(IC701)与微处理器(IC101)相连。当某个功能键合上时所相应产生的行、列信息由IC701进行编码后,输出四位BCD码选通信号至ICI01的PK端。IC701的ST端通过一个施密特触发器(IC7041/6)与IC101的INT(中断)端相连,功能键按下时在IC701的ST端输出一个高电平触发IC7041/
When the LCD is turned on normally, pressing any of the function keys on the AVTO KEYBOARD will not work according to the selected function. Analysis The ten function keys on the EDG6151 keyboard are connected to the microprocessor (IC101) via an encoder (IC701). When a function key is generated when the corresponding row and column information is encoded by the IC701, the four-bit BCD code strobe signal is output to the PKI terminal of ICI01. IC701’s ST terminal through a Schmitt trigger (IC7041 / 6) IC101’s INT (interrupt) connected to the function key is pressed at the ST terminal IC701 output high trigger IC7041 /