视频磁头是录像机的核心部件,由芯片,线圈及金属托板三部分组成。磁头芯片很薄,约0.3mm,一般用热压铁氧体材料制成,硬度高且脆,稍有不慎就会碰裂芯片而损坏视频磁头。录像机用久了,磁头会因磨损使性能下降,因而更换磁头是维修录像机中经常遇到的问题。安装在上磁鼓上的两个视频磁头的装配精度要求很高,因此,一般说来,磁头一经磨损或损坏,应更换原型号的整个上磁鼓。一些录像机由于上磁鼓无处可购。只能闲置在仓库里。一些电子杂志上介绍过几种视频磁头代换方法,虽然成功的概率较高,但代换方法不易掌握或自制工具要求精度高。笔者根据多年维修录 Video head is the core of video recorder components, the chip, coil and metal pallet of three parts. Head chip is thin, about 0.3mm, generally made of hot-pressed ferrite material, high hardness and brittle, a little careless will crack the chip and damage the video head. VCR for a long time, the head will wear due to performance degradation, so replace the head is often encountered in the maintenance of video recorders problems. The mounting accuracy of the two video heads mounted on the upper drum is so high that, in general, the entire upper drum of the original model should be replaced once the head is worn or damaged. Some VCRs are nowhere on the drum. Can only be idle in the warehouse. Some electronic magazines have introduced several video heads substitution method, although the probability of success is higher, but the substitution method is not easy to grasp or self-made tools require high accuracy. Author based on many years of maintenance records