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例1 故障现象:有伴音,图像极暗。分析与检修:调整色度、对比度和亮度均无改善,调整帘栅电位器和聚焦电位器能改变亮度,当接近视觉亮度时,荧屏上出现均匀的满幅回扫线(电压偏高所致)。重点检查亮度调整电路。仔细观察(副亮度)发现,该电位器老化霉锈,动片锈蚀碎裂。更换同数值的半可变电位器,并适当调整后,图像恢复正常。由于 R_(225)的2头开路,无16.5V 经亮度调整电路形
Example 1 Symptom: There are sound, the picture is very dark. Analysis and Overhaul: Adjusting the chromaticity, no improvement in contrast and brightness, adjusting the potentiometer and focus potentiometer can change the brightness, when approaching the visual brightness, the screen appears uniform full recovery line (due to high voltage ). Check the brightness adjustment circuit. Careful observation (deputy brightness) found that the potentiometer aging mildew, moving piece rust fragmentation. Replace the same value of semi-variable potentiometer, and the appropriate adjustments, the image returned to normal. As R_ (225) 2 open, no 16.5V brightness adjustment circuit