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机型及故障现象:一台成都牌C37—844型彩电,每次开机或转换频道时都要重新将天线反复取下、插上,方能出现图像和伴音。分析与检修:从此现象来看,故障可能出在高频调谐器或中放电路。首先检查调谐部分各接插件及相关焊点,均正常;再查调谐部分有关电压和元件也正常,判断故障在中放部分。测IC101各脚电压,基本正常。
Models and Symptoms: A Chengdu brand C37-844 color TV, each time you switch on or change the antenna should be repeatedly removed the antenna, plug in, can appear images and sound. Analysis and Maintenance: From this point of view, the fault may be in the high-frequency tuner or in the discharge circuit. First check the tuning part of the connectors and related solder joints, are normal; check the tuning part of the voltage and components are also normal, determine the fault in the part. Test IC101 voltage of each foot, basically normal.