故障现象一 :透视时 ,发现控制台冒烟 ,有焦糊味。分析与检查 :根据故障现象控制台内冒烟 ,有焦糊味 ,但毫安表不打到头。说明故障原因在低压供电器件和控制元件内。打开控制台检查 ,发现B2 0变压器的一组线包有过电流发热明显 ,用万表测量 :B2 0— 2A与B2 0— 4A、B2 0— 2B与 Symptom 1: At the time of perspective, it was found that the console smoked and there was a burning smell. Analysis and inspection: According to the phenomenon of smoke inside the console, there is a burning smell, but the milliammeter does not hit the end. Explain the cause of the fault in the low-voltage power supply device and control element. Turn on the console inspection and found that a set of B2 0 transformer packs have over-current heating and are obviously measured by thousands of meters: B2 0-2A and B2 0-4A, B2 0-2B and