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松讯系列HA905P/TSDL电话机,夏天因雷击常出现以下某种或几种故障。该机不带电路图且电路板上元件未标号,给维修带来不便。下面专门介绍这些故障的部位和该部位元件在电路板上的位置特征。如遇这些故障,只要按所述特征找到故障元件,更换即可使故障排除。一、不挂机:控制三极管击穿,此管型号为A92,本机中该型号仅此一管。二、不送话:送话放大电路的末级三极管击穿。该
Song series HA905P / TSDL phone, the summer due to lightning often one or more of the following failure. The machine without circuit diagram and circuit board components are not numbered, to bring inconvenience to maintenance. The following sections describe the location of these faults and their location on the board. In the event of these faults, simply by finding the faulty element according to the features described, troubleshooting can be done by changing it. First, do not hang up: control transistor breakdown, the tube model A92, the model in the machine only this one tube. Second, do not send words: sent to amplify the final transistor circuit breakdown. This