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CDC-Ⅱ型50W彩色电视差转机故障现象为:功放级FC-620F金属陶瓷三级管使用不到500小时就衰老损坏。开启高压后,管子出现负栅流且其绝对值随机器工作时间的延长而逐渐增大。此时,机器无自激现象,转发的电视图像和伴音均正常。
CDC-Ⅱ 50W color TV transfer machine malfunction phenomenon: the power amplifier level FC-620F cermet tube less than 500 hours of aging damage. After the high pressure is turned on, the tube exhibits a negative grid current and its absolute value gradually increases as the working time of the machine increases. At this point, the machine no self-excited phenomenon, the transmitted TV images and sound are normal.