引言为了有效地解决边远地区难以收看电视的问题，日本从1975年初到1983年间在NHK所属的电视转播台（站）中，设置了大量的小型电视转播机。目前全国使用这种机器的转播台（站）。约有840个。当初以耐用年数为7年作为设计目标的这种小型电视转播机，自设置以来由于定期进行了维 Introduction In order to effectively solve the problem of remote access to television in remote areas, Japan has set up a large number of small television receivers at NHK affiliated television stations from the beginning of 1975 to 1983. At present, the country’s relay stations (stations) using such machines. About 840. The original small television receiver, which was originally designed for a period of seven years of durable use, has been under regular maintenance since its inception