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故障现象:无光无声。 分析检修:首先检测开关电源+115V电压,发现开机瞬间万用表指针摆动,但很快又消失。初步判断开关电源工作正常,其原因为该机保护电路动作所致。为了判断故障具体部位,断开行扫描电路中的L826,结果+115V电压变为正常,由此判断行扫描电路工作异常。关机测量行管对地正反向电阻,基本正
Symptoms: no light and no sound. Analysis and Maintenance: First test the switching power supply +115 V voltage, found that the moment when switching on the multimeter pointer swing, but soon disappeared. The initial judge switching power supply is working properly, the reason for the machine protection circuit action. In order to determine the specific location of the fault, turn off the L826 line scan circuit, the result of +115 V voltage becomes normal, which determine the line scan circuit is not working properly. Off-line measurement of line to ground positive and negative resistance, the basic positive