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4视频磁头录像机在更换磁鼓或使用日久发生局部机械磨损后,在正常速度放像时,会发生画面清晰,但静止画面出现噪波、抖动或在慢放时图像产生连续的跳跃以及录像的互换性变差等故障。此时应对走带系统的机械部分进行调整。现以松下 L15MC 型录像机为例,介绍一种不用仪器,业余条件下进行调整的方法。如果故障是因录像机更换磁鼓所致,可找一盒标准试带或录制质量较好的原版带,放像时.先将录像机的数字磁迹跟踪开关设置在 OFF 状态,调节磁鼓处的磁带出、入口导带柱,顺时针旋转出口导带柱,当听到磁带有“哗哗”的响声时,可看到下磁鼓边磁带有卷边现象。这时,应逆时针旋转出口导带柱,使磁带在下磁鼓的规槽处刚好卷边。用同样的方法调节入口导带柱。在不调整磁迹跟踪旋钮时,画面应同步,
4 Video Head Recorder When the drum is replaced or worn over a long period of time, the picture may appear crisp when it is played back at normal speed, but the still picture shows noise, jittering or continuous jumping and recording at slow play Interchangeability and other failures. In this case, the mechanical part of the tape transport system should be adjusted. Panasonic L15MC VCR is now an example to introduce a way without instruments, amateur condition adjustment method. If the fault is due to the replacement of the drum recorder, you can find a box of standard test tape or the original tape with better recording quality, first when the recorder’s digital track follower switch is set to OFF, adjust the drum Magnetic tape out of the guide column with the entrance, clockwise rotation of the export guide column, when you hear the tape “rushing ” sound, you can see under the drum edge of the tape curling phenomenon. In this case, rotate the exit guide post counter-clockwise so that the tape is curled just at the groove of the lower drum. Use the same method to adjust the inlet guide column. When not adjusting the track following knob, the picture should be synchronized,