维修案例：GE MR 0.2T伪影故障维修

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                    <section><section><p><br  /></p><p><p><img src="image/20200927/c34665aaf28a61cb584d1d2f9133fa19_1.png" /></p><br  /></p><p><p><img src="image/20200927/64ea76775e7eff83b0e1ea07a6a8ced5_2.png" /></p></p><p><br  /></p><section><section><section><section><section><section><section><section><p><span>设备名称：GE MR&nbsp;</span><span>SIGNA &nbsp;0.2T&nbsp;</span></p><p><span>关键词：伪影</span></p></section></section></section></section></section></section></section><section><section><section><section><section></section><section></section></section><section>故障现象</section><section><section></section><section><br  /></section></section></section></section></section><section><section><section><section><section><section><section><p><span></span></p><p><span>图像有伪影</span></p></section></section></section></section></section></section></section><section><section><section><section><section></section><section></section></section><section><p>故障信息查看</p></section><section><section></section><section><br  /></section></section></section></section></section><section><section><section><section><section><section><section><p><span></span></p><p><p><img src="image/20200927/68fee4fa75007c80401ec7a15b3e1f53_3.png" /></p></p><p><span><strong><span></span></strong></span></p><p><strong><span></span></strong></p><p><span>（１）正中间一个亮点，其余很暗，图像没有诊断价值。</span></p><p><span></span></p><p><p><img src="image/20200927/1d2acc10c036bdac848c424276263a1b_4.png" /></p></p><p><span>（２）中间有一条水平亮线，以白线为界，发现在下部有一虚的镜像。</span></p><p><span></span></p><p><p><img src="image/20200927/3ffe94b441c723046b63e2130e1070db_5.png" /></p></p><p><span>（３）中间有一条垂直亮线，左右两边图像有重叠现象。</span></p><p><span><br  /></span></p><p><span><span>查看主机</span>ERROR LOG,发现近一周以来，几乎每次开机时都报CERD错误，</span><span>故障码</span><span>:</span><span>2236416,2236568。</span></p><p><span><br  /></span></p><p><span>故障分析：</span><br  /></p><p><span></span></p><p><span><span>由于</span>ERROR LOG明确提到UCERD不良，判断伪影可能是UCERD引起，但图像中间的白线不排除是梯度不良造成的。因此，梯度和UCERD都需要确认是否是产生故障原因。&nbsp;</span></p><p><span></span></p></section></section></section></section></section></section></section><section><p><br  /></p><section><section><section><br  /></section><section></section></section><section><p>故障解决</p></section><section><section></section><p><br  /></p></section></section><p><br  /></p></section><section><section><section><section><section><section><section><p><span><span>1、诊断</span>UCERD，CERD,IPG,SBAM此案例均合格。</span></p><p><span><br  /></span></p><p><span>2、</span><span>测量CERD电源，5.03V,-5.29V,+14.96V,-15.00V.正常。</span></p><p><span><br  /></span></p><p><span>3、关机，半小时后再次开机。</span></p><p><span><br  /></span></p><p><span>4、</span><span>查看ERROR LOG。发现还报</span><span>故障码</span><span>2236416,2236568。</span></p><p><span><br  /></span></p><p><span>5、进行诊断CERD,结果</span><span>出现</span><span>报错</span><span>信息</span><span>。</span></p><p><span>系统报错</span><span>ASC-223416,AIME-2236329.RAP-2236453.EXCITER-2236717.RECEIVER-2236701。</span></p><p><span><br  /></span></p><p><span>6、</span><span>试扫描体模，发现图像开始变差，最后序列时，出现了亮点伪影。</span></p><p><span><br  /></span></p><p><span>7、测量梯度AUX电源，+5.30V,+14.80V,-14.85V,+41.6V，属正常范围。</span></p><p><span><br  /></span></p><p><span>8、扫描时出现亮点伪影，重复扫描三次仍不行，</span><span>进行开关机</span><span>。</span></p><p><span><br  /></span></p><p><span>9、再次进行</span><span>扫描时正常。</span><span>进行</span><span>重</span><span>插</span><span>UCERD。</span></p><p><span><br  /></span></p><p><span>10、下午</span><span>测试</span><span>开机正常，无报错，扫描正常。</span></p><p><span><br  /></span></p><p><span>11、隔日测试</span><span>，机器开机正常，无报错。</span></p><p><br  /></p><p><span>故障解决：</span></p><p><span><span>重插</span>UCERD后故障消失。&nbsp;</span></p><p><br  /></p></section></section></section></section></section></section></section><section><section><section><section><section><br  /></section><section></section></section><section><p>维修心得</p></section><section><section></section><section><br  /></section></section></section></section></section><section><section><section><section><section><section><section><p><span></span></p><p><span></span></p><p><span><span>此故障真正原因是</span>UCERD接触不良造成的伪影。</span></p><p><span>故障表象</span><span>却有</span><span>类似如</span><span>梯度</span><span>故障一样的</span><span>问题。</span><span>解决此问题需按排障流程逐项进行排查。</span></p><p><span></span><br  /></p></section></section></section></section></section></section></section><section><section><section><p><br  /></p></section></section></section></section><p><br  /></p><p><strong><span>【版权声明】：本文由整理发布，资料源自健康力，版权归原作者所有，转载请注明来源！</span></strong><br  /></p></section></section><p><br  /></p><p><br  /></p><section><p><img src="image/20200927/21d008357f8ce1bc599c3975272723ad_6.jpg" /></p><span><strong>微信ID：yxiubang</strong></span></section><section><span><strong><p><img src="image/20200927/e2407af514574edf48337e7db8b123a1_7.jpg" /></p>长按左侧二维码关注</strong></span></section><p><br  /></p><p><br  /></p>