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故障现象:黑白图像正常,上彩后缺红色,并且开机十五分钟左右图像慢慢暗下来,直到完全没有图像,伴音始终正常。故障分析与检修:根据故障现象分析,上彩后缺红色,故障一般发生在红色视放电路,图像慢慢暗下来,直到没图像,可能是显像管发光条件不满足(灯丝电压、加速极电压、栅—阴电压、第二阳极高压等)。开机首先测量A_(602)第④脚电压8.1V,第①脚电压180V证实红视放管没工作,拆下此管测
Symptoms: black and white images are normal, the lack of color after the red, and power 15 minutes or so slowly darken the image, until there is no image, the sound is always normal. Failure Analysis and Maintenance: According to the analysis of the fault phenomenon, the lack of red after the color, the fault usually occurs in the red as the circuit, the image slowly dark until no image, the tube may be not satisfied with the lighting conditions (filament voltage, accelerating voltage, Gate-cathode voltage, second anode high voltage, etc.). Boot first measure A_ (602) fourth leg voltage 8.1V, the first leg voltage 180V confirmed that the red as the tube did not work, remove the tube test