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故障现象:有光栅、无图象、无伴音、无噪波点干扰,故障持续时间从几秒到十几秒钟不等,出现故障的间隔时间也不等。故障分析:因有光栅、无图象、无伴音,故障多出现在公共通道部分,所以应重点检查高频头,中放及预视放等电路。
Symptoms: a grating, no images, no sound, no noise point interference, fault duration from a few seconds to more than ten seconds ranging from the failure interval. Failure Analysis: Due to the grating, no images, no sound, the fault occurred in the public part of the channel, it should focus on checking the tuner, the release and pre-amp and other circuits.