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前端——有线电视系统的心脏,一旦发生故障,如不能及时排除,后果是可想而知的。我站系引进西德维斯产品,前端箱内电源板上可安装10台“VN20”或“VN13”频道放大器,俗称单放。均由“VA36”稳压源供电。多年实践证明:这些单放多发故障为隔离二极管击穿使电源板短路,“VA36”一送电即断保险而不能供电,各单放也因失压不能工作,信号传输中断,全系统处于瘫痪。笔者用插拔法在很短时间内能查出上述故障点。其方法将是万用表置R×1挡,正表笔接电源板上
The front - the heart of the cable system, in the event of failure, if not excluded, the consequences can be imagined. I station to introduce the West Germany Siwei Si products, front-end box can be installed on the power board 10 “VN20” or “VN13” channel amplifier, commonly known as a single release. All powered by “VA36” regulated source. Years of proven: these single multi-issue fault isolation diode breakdown to the power board short circuit, “VA36” a power that is cut off the insurance and can not supply, the single also due to loss of pressure can not work, signal transmission interruption, the whole system is in a state of paralysis. The author uses plug-in method in a very short period of time can detect the above point of failure. The method will be multimeter set R × 1 block, is the table pen connected to the power board