图像在垂直方向上抖动称为场抖。造成场抖原因较复杂,维修起来难度也较大。这是因为出现这类故障时场扫描电路的电压和波形往往没有什么明显的变化。场抖的规律也不大好掌握,现象在场扫描,而造成这一现象的根本原因有时却并不在场扫描电路,而是在中放电路、AGC电路、同步电路或行扫描电路等。可见造成同一故障的原因范围之广。因此维修也较困难,本人通过多年的维修经验和维修记录摸索出以下几点 Image jitter in the vertical direction is called field jitter. Caused by the reasons for the scene more complicated, more difficult to repair. This is because there is often no significant change in the voltage and the waveform of the field-scan circuit when such a fault occurs. Field shaking is not a good grasp of the law, the phenomenon of scanning the scene, and the root cause of this phenomenon is sometimes not the presence of scanning circuit, but in the discharge circuit, AGC circuit, synchronization circuit or line scan circuit. Visible cause of the same failure a wide range of reasons. Therefore, maintenance is more difficult, I have many years of maintenance experience and maintenance records to explore the following points