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一台使用了一年半的东芝Ｅ５７６１ＧＤＰ４Ａ影像增强器，在工作中突然出现影像模糊、周边毛糙的故障，调整增强器聚焦电位器ＶＲ１、ＶＲ２均无效。在检修多台此类增强器中，此现象属初次遇见，特把此故障的现象、分析及排除写出，供同行参考。１ 故障现象在用０．４ｍＡ、
A Toshiba E5761GDP4A image intensifier that had been used for one and a half years suddenly caused image blurring and rough peripheral faults during operation. Adjusting the intensifier potentiometers VR1 and VR2 was ineffective. In the case of overhauling such multiple boosters, this phenomenon is met for the first time. Specially, the phenomenon, analysis, and exclusion of this failure are written out for reference by the peers. 1 The fault phenomenon is 0.4mA,