该故障发生在指示灯电路,其原因有:(1)指示灯公共电源线折断;(2)接线器XB2接触不良;(3)电阻R13、R14开路;(4)指示灯LED1、LED2击穿或引脚锈断。经检查指示灯引脚锈断较多见。更换发光颜色相同的发光二极管,故障即排除。 |
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