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分析与检修:造成场不同步的原因有:(1)场同步信号没有加上;(2)场频偏离50Hz太远,超出了场同步捕捉范围;(3)自动增益控制或同步分离电路不正常,使脉冲宽度较宽的场同步信号分离不良等。检修时为了判别是哪一部分引起的故障,可调节场同步电位器进行分析。若能使图像瞬间同步或上下翻滚变慢,并且电位器又未出现极值,说明场振荡频率正常,故障在同步电路;如果调节场同步电位器不能瞬间同步,电位器又出现极值,说明场振荡频率偏离正常
Analysis and Overhaul: The causes of field out-of-sync are: (1) field sync signal is not added; (2) the field frequency deviates too far from 50 Hz beyond the field sync capture range; (3) AGC or sync split circuit is not Normal, the pulse width of the field sync signal separation is poor and so on. Overhaul in order to determine which part caused the fault, adjustable field potentiometer for analysis. If the image can be synchronized instantly or up and down slow down, and the potentiometer did not appear extreme, indicating normal field oscillation frequency, the fault in the synchronization circuit; if the adjustment field synchronous potentiometer can not be synchronized instantly, the potentiometer and the extreme occurs, indicating Field oscillation frequency deviation from normal