一些电脑操作者(尤其是初学者),为了节省时间往往在开机状态下插拔打印机电缆,使得系统板被烧坏。这时应首先更换打印机接口处理芯片。若故障仍未排除,则可能烧坏了多个芯片。对这些芯片可采用“静态电阻”测量法判断是否烧坏,具体做法是:用万用表在开机状态下测量芯片的输入信号及输出信号的电阻值。例如:74LS245芯片,它的输入脚对电源(+5V)的电阻值为65kΩ,反向电阻为截止状态;它的输出脚 Some computer operators (especially beginners), in order to save time often in the boot plug the printer cable, making the system board is burned. At this time should first replace the printer interface processing chip. If the fault is still not ruled out, it may burn multiple chips. These chips can be used “static resistance” measurement method to determine whether the burn out, the specific approach is: Use the multimeter to measure the chip’s input signal and the output signal resistance value in the boot state. For example: 74LS245 chip, its input pin to the power supply (+ 5V) resistance of 65kΩ, the reverse resistance is off; its output pin