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在黑白电视机的故障概率中,行扫描电路的故障率最高,其故障特征多是烧直流保险丝或是有声音无光栅,有少数机器表现为行幅不满或是光栅暗淡等等。当遇到这类故障时如能遵循下列检修方法,则将大大缩短检修时间,减少误判,提高检修效率。下面以常见的国产14英寸黑白电视机为例,逐步介绍行扫描电路的五步检修法。第一步:直流电压法此法是用万用表的直流电压档测量电源电压(12 V)及行输出级的提升电压(26 V)是否正常。根据测量结果即可大致判定故障是否在行
In the probability of black and white TV failure, the highest failure rate of line scan circuit, the fault characteristics are mostly burned DC fuses or no sound grating, a small number of machines expressed as line width or dim light grating and so on. In the event of such failures such as follow the following maintenance methods, it will greatly reduce maintenance time, reduce misjudgment and improve maintenance efficiency. The following to the common domestic 14-inch black and white TV, for example, step by step introduced five-step scanning circuit repair method. The first step: DC voltage method This method is to measure the power supply voltage (12 V) and line output level of the step-up voltage (26 V) using a multimeter DC voltage file is normal. According to the measurement results can be roughly determine whether the fault line