好学医电在线

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<section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><section><svg viewbox="0 0 1 1"></svg></section></section><section><section powered-by="gulangu"><p><strong>明日复明日，明日何其多。</strong></p></section><section powered-by="gulangu"><p>○</p></section><section powered-by="gulangu"><p><strong>无畏的太阳</strong></p></section><section powered-by="gulangu"><p>○</p></section><section powered-by="gulangu"><p><span>医疗|学习|钻研|电子电路|原理</span><br  /></p></section></section><section><section><svg viewbox="0 0 1 1"></svg></section></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p><img src="image/20201019/b45b627416baa2e99ab892d5ae445cc4_1.jpg" /></p></section></section><section powered-by="gulangu"><p><strong>欢迎关注</strong></p></section></section><section><section powered-by="gulangu"><section><p><img src="image/20201019/c00b89f8faeee75f25cd97175ce254d2_2.png" /></p></section></section><section powered-by="gulangu"><p><strong>好学医电在线</strong></p></section></section></section><section powered-by="gulangu"><p><strong>请留下你指尖的温度</strong></p><p><strong>让太阳拥抱你</strong></p><p><strong>记得这是一个有温度的公众号</strong></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><br  /></section></section></section><section><section powered-by="gulangu"><section><section><br  /></section></section></section></section><section><section powered-by="gulangu"><section><p>眼底照相机（Digital Fundus Camera）VISUCAM 500</p><p><br  /></p></section></section></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><br  /></section></section></section></section></section></section><section><section powered-by="gulangu"><section><br  /></section></section></section></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><br  /></section></section></section><section><section powered-by="gulangu"><section><p><strong>故障现象</strong></p></section></section></section></section><section powered-by="gulangu"><p><strong>①曝光杆移动到某个位置按下按钮没有任何反应，不能曝光。</strong></p><p><strong>其他位置可以正常曝光，曝光图像正常显示在电脑上。</strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/26dea485277074d18820b50efcc1b906_3.jpg" /></p></section></section><section powered-by="gulangu"><p><strong>②开机，新建病人，调整好曝光杆位置。</strong></p><p><strong>按下曝光按钮的时候，设备发出滋滋滋的电流声。</strong></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><br  /></section></section></section><section><section powered-by="gulangu"><section><p><span>分析过程</span><br  /></p></section></section></section></section><section powered-by="gulangu"><p><strong>一、原理</strong></p></section><section powered-by="gulangu"><p><strong>首先220VAC经高压板上的4个470UF大电容转换成瞬间400VDC高压，给设备镜头里面的闪光灯提供瞬间高压。</strong></p><p><strong>再通过曝光杆上面的按钮，给出曝光信号到主板，触发高压板，从而达到曝光效果。</strong></p><p><strong>最后将拍摄到的眼底图像，传送到电脑上，显示出来。</strong></p></section><section powered-by="gulangu"><p><strong>二、分析</strong></p></section><section powered-by="gulangu"><p><strong>根据故障①描述的，<span>移动到</span>特定位置不能曝光，其他可以。</strong></p><p><strong>说明曝光系统整个环节正常，判定内部线路在特定位置出现接触不良导致按钮失效。</strong></p><p><strong>根据故障②描述的，只有曝光的时候才会有电流声，初步判断高压板输出部分电压脉冲异常或者接口接触不良。</strong></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><br  /></section></section></section><section><section powered-by="gulangu"><section><p><strong>解决方法</strong></p></section></section></section></section><section powered-by="gulangu"><p><strong><span>①：</span><span>首先</span><span>拆开曝光杆，<span>蜂鸣档</span>检测内部微动开关管脚，均正常，<span>故</span>排除。</span></strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/b038e415e4777169fa298026644ec143_4.jpg" /></p></section></section><section powered-by="gulangu"><p><strong><span>接着测量微动开关三根接线到主板的通断情况，发现有断线，</span><span><span>经</span></span><span>焊接处理，试机已经修复。</span></strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/6490c8acb2e784e212d88a5cc0069393_5.jpg" /></p></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/72b4ffde15477b4e4130b17ff1efe54b_6.jpg" /></p></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><p><strong><span>②：首先拆开设备底部，可以清楚看到主板，电源板，高压板。</span></strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/84d586288b1d3848df3820e8b93dc561_7.jpg" /></p></section></section><section powered-by="gulangu"><p><strong><span>接着做好绝缘情况下，上电，按下曝光按钮在线观察。</span></strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/78b440b249fe7164de2a24e4fac572b3_8.jpg" /></p></section></section><section powered-by="gulangu"><p><strong><span>发现高压板上的输出接口处有滋滋滋的声响并伴随着火花。</span></strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/f26d9941edf5d9a1ba7cbc56d7a900a3_9.jpg" /></p></section></section><section powered-by="gulangu"><p><strong><span>关机，拔出接在上面的高压线缆，用酒精清洁接口处，接回去线缆，试机，故障依旧。</span></strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/8efd0ad0db52f5eca24980de6f39df27_10.jpg" /></p></section></section><section powered-by="gulangu"><p><strong><span>最后判定接口内部有松动或者失去绝缘，导致有漏电流，从而引发滋滋滋的声响。</span></strong></p><p><strong><span>更换接口已经修复。</span></strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/5d792bc5d070ac2893ba759632e3c7da_11.jpg" /></p></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/43e575d3afb29cc60e713fb8bdc7e70f_12.jpg" /></p></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p>欢</p></section></section></section><section><section powered-by="gulangu"><section><p>迎</p></section></section></section><section><section powered-by="gulangu"><section><p>关</p></section></section></section><section><section powered-by="gulangu"><section><p>注</p></section></section></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p><img src="image/20201019/b45b627416baa2e99ab892d5ae445cc4_1.jpg" /></p></section></section></section><section><section powered-by="gulangu"><section><section></section></section></section></section><section><section powered-by="gulangu"><p>好学医电在线</p><p>和他的朋友们</p></section></section></section><section powered-by="gulangu"><section><section><svg viewbox="0 0 1 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