现在很多居民小区为了提高治安防范能力,在各个楼幢门口安装了防盗门,同时,每户装配有对讲机,便于每家直接与楼门外的来客通话联系。这种对讲机使用频繁,因此易出故障,现就其基本电路原理以及常见故障的维修作一介绍。一、电路原理图1所示为主机电路(装于楼幢门口的防盗门 Now many residential communities in order to improve public security precautions in all Louzhu door installed security door, at the same time, each household equipped with walkie-talkie, easy to each directly with the visitors outside the building call contact. Frequent use of this interphone, so easy to fail, is now on its basic circuit principles and maintenance of common faults to make an introduction. First, the circuit diagram 1 shows the host circuit (installed at the entrance of the building security door