一、故障现象一台HAX—100型程控交换机(香港产),因受雷击,所有电话分机处于瘫痪状态,拿起话筒,听到有“喳喳”的杂音,按按键,电话无任反应.二、故障诊断与排除初步判断敌障在电脑板上.关掉主机电源,把电脑板从机柜抽出来,首先观察线路板上的有关元件有没有被击穿,并用数字万用表测量中央处理器Z80—CPU各脚的对地 First, the fault phenomenon A HAX-100 program-controlled switches (Hong Kong-made), due to lightning, all telephone extensions in a paralyzed state, pick up the handset, hear a “chatter” noise, press the key, the phone without any response. , Fault diagnosis and troubleshooting initially determine the enemy in the computer board off the host power supply, the computer board out from the cabinet, the first observation of the circuit board components have not been punctured and measured with a digital multimeter CPU Z80- CPU feet of the ground