| 检修过程：测Q5发射极对地+18V电压、U3（LM7805）输出端对地+5V电压均正常。测比较器每脚对地电压均正常。用三用表电阻100Ω档，检查电流互感器次级绕组发现通往R2电阻一端与电路之中断裂。导致电流检测取样电压，无法进入CPU第12脚，（BVZ-CUR）重焊电路后整机恢复正常。 |
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