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例1 故障现象:放像时图像不清晰,且图像上有许多白色条纹。检修方法:根据笔者经验,该故障往往是由于视频磁头脏污或磨损造成的。首先清洗磁头,用无水酒精将磁鼓表面润湿,然后用鹿皮顺着磁鼓旋转方向轻轻擦洗。若效果明显改善,直至恢复正常,说明故障系磁头脏污所致,否则可判为磁头磨损,只有更换磁鼓,别无他法。本机经清洗后,故障依旧,说明该机磁头已磨损。后经用户介绍,该磁头已使用累计3000多个小时,已超过磁头的正常使用寿命(1000～3000小时)。检修小结:由于磁头磨损,其工作隙深度减小,磁阻增大,从而损耗相应增大,磁头电感量减少,导致高频损耗增加,高频信噪比下降,但低频重放效率却提高,因此出现图像不清晰,细节模糊,伴有白色条纹的
Example 1 Symptom: The image is not clear during playback and there are many white stripes on the image. Maintenance methods: According to the author’s experience, the fault is often caused by the video head dirty or worn. First clean the magnetic head, moisten the surface of the drum with anhydrous alcohol, and then gently scrub with the deerskin in the direction of the drum rotation. If the effect is obviously improved, until the return to normal, indicating that the failure of the Department of head caused by dirty, or can be judged as head wear, only the replacement of the drum, no alternative. After cleaning the machine, the fault still shows that the head of the machine has been worn. After the introduction by the user, the head has been used for more than 3000 hours, has exceeded the normal head life (1000 ~ 3000 hours). Maintenance Summary: As the head wear, the working depth decreases, the reluctance increases, resulting in a corresponding increase in loss, reducing the amount of head inductance, leading to increased high-frequency loss, high-frequency signal to noise ratio decreased, but low-frequency replay efficiency but increased, so Images appear unclear, blurred details, accompanied by white stripes