故障现象:刚开机时,色彩、图像和伴音均正常。但随着收看时间增长,信号逐渐变弱。色彩、图像和伴音先后消失,有时经微调,又可捕捉到图像和伴音,但过一段时间后再次逃台。分析检修:造成逃台的原因主要有三个:一是调谐电压BT不稳;二是AFC电路有故障;三是高频头性能不良。为了迅速而准确地判断故障的部位,必须鉴别出故障的原因是在外部电路,还是在 Symptoms: just boot, color, images and sound are normal. However, as the viewing time increased, the signal gradually weakened. Color, images and sound disappeared one after another, sometimes fine-tuning, but also capture images and sound, but after a while to escape Taiwan again. Analysis and maintenance: resulting in the reasons for the escape of Taiwan there are three main: First, the tuning voltage is not stable BT; Second, there is a fault AFC circuit; Third, the poor performance of the tuner. In order to quickly and accurately determine the fault location, you must identify the cause of the fault in the external circuit, or in