论文部分内容阅读
飞利浦黑白电视机在使用过程中经常出现图像整幅抖动现象,但是荧光屏出现明亮画面,而画面背景偏暗时,抖动较小甚至不抖动。经检查高频头电路及图像通道电路未发现异常。借助于示波器观察同步信号,其幅度缩小而畸变,认为图像通道存在匹配不良现象,引起特性失常。为了解决高频头与通道之间的匹配,试在高频头输出端与预中放之间接入0.047μF
Philips black and white TV sets often appear in the process of using the whole image jitter, but the screen appears bright picture, and the picture background darker, the jitter smaller or not jitter. After checking the high-frequency circuit and the image channel circuit is not abnormal. With the oscilloscope to observe the synchronization signal, its amplitude reduced and distorted, that there is a mismatch in the image channel phenomenon, causing abnormalities. In order to solve the matching between the tuner and the channel, try to connect 0.047μF between the tuner output and pre-release