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现以市面上拥有量较大的HA868型按键式电话机为例,介绍电话机中最基本的电路,通话电路的工作原理及常见故障的检修方法。其他型号电话机通话电路的工作原理与之基本相同,当出现故障时,亦可参照以下介绍的方法进行检修。HA868型电话机通话电路如图1所示。
HA868 is now available in the market a large number of key phones, for example, describes the basic telephone circuit, call the working principle of the circuit and common troubleshooting methods. Other types of telephone conversation with the working principle and basically the same, in the event of failure, may also refer to the methods described below for maintenance. HA868-type phone call circuit shown in Figure 1.