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故障现象:图象功放盘第二、三级阴流指示增大。故障分析:从本机功放盘测量表头看出各级阴流,第一级和末级阴流均正常,第二级阴流指示为90mA,第三级阴流指示为67mA左右,远远超出正常值40～50mA。用万用表测量各级阳极电压如下:第一级为260V,第二、第三级为400V,末级为550V,都属于正常值。各级灯丝电压均正常。但测得各级的负栅压分别为:a点-24V,b点-19V,c点和d点均为-14.5V。如图1所示。
Symptom: Image amplifier disk second, three instructions to increase the flow of the Yin. Fault Analysis: From the local power amplifier panel to see the meter head at all levels of the Yin, the first level and the end of the Yin are normal, the second level Yinzhao instructions for the 90mA, the third Yincui instructions for about 67mA, far Beyond the normal 40 ~ 50mA. With a multimeter to measure the anode voltage at all levels are as follows: the first level of 260V, the second and third levels of 400V, the final level of 550V, all belong to the normal value. Filament voltage at all levels are normal. However, the negative gate voltage measured at all levels were: a point -24V, b -19V, c point and d point are -14.5V. As shown in Figure 1.