支干线短路故障的检修□任永刚（黑龙江省密山市广播电视局１５８３００）密山市有线电视台１９９７年夏秋之交，有一大批用户反映，所有电视频道的图像断断续续并且闪动，无法收看。我们根据故障影响的用户范围，从后向前逐步检查，发现前端至三合干线上的第二台干线放大... Maintenance of short-circuit fault in branch line □ Yongyong Gang (Radio and Television Bureau of Mishan City, Heilongjiang Province 158300) Mishan Cable TV Station At the turn of summer and fall of 1997, a large number of users reported that the images of all the television channels were intermittent and flashing and could not be watched. According to the scope of the user affected by the failure, we gradually inspected from back to front and found that the second trunk line on the front-end to the Sanhe trunk was enlarged ...