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判断和检查有线电视系统的故障一般按以下程序进行。1.判断系统有无故障的方法系统有无故障主要是根据两个方面判断:一是整个小区用户无法收看电视或收看质量差;另一个是个别用户的电视收看质量差或某一个频道的图像质量差。对于前者可以肯定系统或系统的某一分支出现了故障;对于后者可能问题出现在电视机本身或出现在电视信号插座上。系统是否存在故障,主要是根据信号流程和信号电平分配情况,先凭主观分析,后借助测量
Judge and check the cable system failure generally according to the following procedure. 1. To determine whether the system has a fault-free system The system is mainly based on two judgments: First, the entire community can not watch TV or watch poor quality; the other is the individual user’s TV to watch the poor quality or a channel image low quality. For the former, one of the branches of the system or system can be identified as having a problem; for the latter, the problem may be with the television itself or with the television signal outlet. System is faulty, mainly based on the signal flow and signal level distribution, the first subjective analysis, with the help of measurement