西门子X线机监视器无光栅的检修

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                    <p><strong style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><strong style="font-size: 16px; line-height: 25.6px; white-space: normal; color: rgb(62, 62, 62); text-align: justify; max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><img class="__bg_gif" data-ratio="0.10555555555555556" src="http://mmbiz.qpic.cn/mmbiz/M2H0aGBjWUTRia7nqkArYeKZUqEfdmpNibMPiaZk4gvlWk5v5lUKyXhjJP4CENKQeQt5HI8zwcTCWJOkicfWJiatdJQ/0?wx_fmt=gif" data-type="gif" data-w="720" width="auto" style="text-indent: 32px; line-height: 25.6px; box-sizing: border-box !important; word-wrap: break-word !important; visibility: visible !important; width: auto !important;"  /></strong>&nbsp;</strong></p><p><strong style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">故障&nbsp;&nbsp;</strong><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">&nbsp;</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">一台德国产西门子1000mA C臂X线机，现改装为数字减影介入系统(DSA)，启用后出现两例有关电视监视系统(18英寸SIEMENS)的故障。现将分析与检修过程介绍如下，便于同行维修参考。</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><strong style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">故障分析</strong><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">&nbsp; &nbsp; 例1：在做介入手术的过程中，有一台监视器突然光栅收缩，然后无光栅，但电源指示灯亮。</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">&nbsp; &nbsp; 根据电路图分析，造成此故障的部位可能在：</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">(1)稳压电源电路；</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">(2)行振荡电路；</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">(3)行推动电路；</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">(4)行输出电路。首先外观检查，发现电阻R44(27Ω)有烧焦的痕迹，用万用表测量16V电源正常(参G5270-7a-2电路图)，而通过电阻R44的另一端(即滤波电容C21两端电压)无14V电压，经检查R44电阻已烧断。用万用表检查14V电源的负载情况，有短路现象，由此怀疑14V电源的滤波电容击穿。重点检查14V电源有关滤波电容C24～C21，发现C21(22uF／25V)电容击穿，</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><strong style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">解决办法</strong><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">试更换滤波电容C21和电阻R44，开机测C21端电压为14V，正常。</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><strong style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">故障二</strong><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">：给患者治疗前，试机调整过程中，突然无光栅，但电源指示灯亮。&nbsp;</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><strong style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">故障分析</strong><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">&nbsp; &nbsp; 根据电路图分析认为，造成此故障部位与上述(1)～(4)相同。首先外观检查，未发现异常。后从电源部分下手，当查到行振荡块V50（TCA971)的⑧脚供电电源时，发现无电压，而测对地电阻为零，怀疑该电源的滤波电容有击穿现象。</span><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><strong style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">解决办法</strong><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><br style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);">经查为C53(6．8uF）电容击穿。用10uF电容代换后试机，电压恢复正常。&nbsp;</span></p><p><span style="max-width: 100%; color: rgb(62, 62, 62); font-size: 16px; line-height: 25.6px;  box-sizing: border-box !important; 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