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故障现象 接通电源 ,机内冒烟 ,两只 5A电源保险丝熔断。分析检修 打开机壳 ,发现电源电路板上一些元件有烧灼痕迹 ,取出电路板仔细检查 ,发现光电耦合器DK10 -11(CNY17-4 )炸裂 ;12V电源变压器TR1的电源输入端引脚烧断一只 ;变压器覆盖区下的一条通往DK10 -11的
Fault phenomenon Turn on the power, smoke inside the machine, two 5A power fuse blown. Analyze and open the case and find that some components on the power circuit board have burn marks. Take a careful inspection of the circuit board and find that the optocoupler DK10-11 (CNY17-4) bursts; the pin of the power input terminal of the 12V power transformer TR1 blows off. Only; one under the transformer coverage area leading to DK10 -11