首先多谢您指教了.我已经检查过了主焊接变压器和集成控制变压器.都没问题.输出正常.三相整流桥也是好的.大功率晶体管模块也更换过了还是有好象是短路的现象.有10只100v6800uf并联的电解电容器,看不出有什么毛病.我手头没有这么大的电容表,测不出.

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是达林顿管模块,和整流模块组成的