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故障现象:使用岛津XHDI 50B-10型X线发生器,开机后,透视无异常,但当按下点片曝光预备闸时,无规律出现OVER灯亮现象,不能进行点片.此时检查控制台面板,点片KV、mA、时间都在负载允许范围内,而且在能进行点片时,mAS指示值与预示值一致,透视时KV、mA表无异常指示.根据电路原理图,OVER指示灯亮有下述几种情况;(1)主可控硅击穿;(2)mA控制电路中的主晶体管击穿或整流二极管击穿;(3)由于X线管损贲坏,高压电缆击穿而引起大mA或mAS;(4)由于设置的X线条件超过负载范围;(5)电源调节轮或R-KV到了上下限极限位.故障分析 根据粗略检查和透视无异常增况,可以断定故障不出现在以上1.2.3.4所表述的情况,打开控制台,检查
Symptom: After using the Shimadzu XHDI 50B-10 X-ray generator, there is no abnormality in the perspective after the power is turned on. However, when the spot exposure preparation gate is pressed, there is no regular phenomenon of the OVER light, and the inspection cannot be performed. The panel, spot KV, mA, and time are all within the allowable range of the load, and when the spot can be spotted, the mAS indication value is consistent with the predicted value. During the see-through, the KV and mA meters have no abnormal indication. According to the circuit schematic, the OVER indication There are several situations in which the lamp lights: (1) main thyristor breakdown; (2) main transistor breakdown or rectifier diode breakdown in the mA control circuit; (3) high voltage cable strike due to X-ray tube damage Wearing leads to a large mA or mAS; (4) The X-ray condition is set to exceed the load range; (5) The power adjusting wheel or R-KV reaches the upper and lower limits. Failure analysis can be performed according to a rough inspection and perspective without abnormal increase. To conclude that the failure does not occur in the situation described in 1.2.3.4 above, open the console and check