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一台长虹14时黑白电视机,出现了场不同步故障:调节场频电位器,图像可瞬时同步,并在瞬时同步时有轻微场抖。因行同步正常,说明同步分离正常,怀疑是场扫描电路的双积分电路有故障,但替换后,故障依旧。由于存在轻微场抖,又怀疑锯齿波形成电路、中放电路、AGe 等电路有故障,然而,通过检测与替换,均未排除故障。后来,注意观察光栅,见光栅时而有轻微收缩现象。此时监测电源电压,发现电源电压随光栅的收缩而轻微波动,并略为偏高。调节电源可
A Changhong 14 black and white TV, there is no field sync failure: Adjust the field potentiometer, the image can be instantaneous synchronization, and there is a slight field sync shake instantaneous synchronization. Due to the normal line synchronization, indicating synchronous separation is normal, suspected double field integration circuit scanning circuit is faulty, but the replacement, the fault still. Due to the slight field jitter, but also suspected sawtooth wave circuit, in the discharge circuit, AGe and other circuits have failed, however, through the detection and replacement, did not rule out the fault. Later, pay attention to observe the grating, see the grating sometimes there is a slight contraction. At this point monitoring the supply voltage and found that the power supply voltage with the grating contraction and slight fluctuations, and slightly higher. Adjust the power supply can be