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录像机在使用一段时间后,视频磁头上都会粘附有脏物。通常的现象是画面上有噪波干扰,上半部尤为明显;脏污严重时,还会出现水平的黑道与白道,彩色时有时无,图像抖动,影响观看。
After the video recorder is used for a period of time, the video head will be attached with dirt. The usual phenomenon is the noise on the screen, especially in the upper half. When the dirt is serious, there will be horizontal underworld and white road.