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例1 故障现象:录像机走带正常,放像时图像中下部有噪点。分析与检修:(1)视频磁头脏堵;(2)上下磁鼓位置偏移。首先擦洗视频磁头,虽有所改善但不明显,进一步怀疑磁头脏堵历害,拆下上磁鼓,彻底对磁头清洗,磁鼓复原后,故障依旧,基本排除视频磁头故障。之后对下磁鼓位置进行观察,未发现有错位现象,为了证实磁
Example 1 Symptom: VTR go normal, the lower part of the image when there is noise. Analysis and overhaul: (1) video head dirty block; (2) up and down the drum position offset. First scrub the video head, although the improvement is not obvious, further suspicion of head clogging damage, remove the upper drum, the head cleaning, drum recovery, the fault still basically ruled out the video head failure. After the drum position under the observation, did not find a dislocation phenomenon, in order to confirm the magnetic