在有线电视网络维护工作中，会遇到多种故障现象，其中多数故障现象相对稳定，比较容易处理，而有的故障因规律性不明显，一般较难处理。但是，只要结合有关知识，仍能够找出其规律性。现将处理此类故障的一例记录下来，供同行参考。 在某片区，经常接到用户反映：图像上无规律 In cable network maintenance work, you will encounter a variety of fault phenomena, most of which are relatively stable fault phenomenon, relatively easy to handle, and some failures due to regularity is not obvious, generally more difficult to handle. However, as long as the relevant knowledge is combined, the regularity can still be found out. Now an example of dealing with such failures recorded for peer reference. In a certain area, often receive the user to reflect: the image is irregular