超声设备“死机”故障的应对方法(二)

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                    <section class="" data-source="bj.96weixin.com" style="max-width: 100%; color: rgb(62, 62, 62); line-height: 25.6px; white-space: normal; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><section class="" style="max-width: 100%; box-sizing: border-box; text-align: inherit; border: 1px solid rgb(0, 187, 236); font-size: 1em; font-family: inherit; font-weight: inherit; text-decoration: inherit; color: rgb(51, 51, 51); word-wrap: break-word !important; background-color: rgb(239, 239, 239);"><section class="" style="padding: 16px; max-width: 100%; box-sizing: border-box; font-size: 1em; line-height: 1.4; font-family: inherit; word-wrap: break-word !important;"><section class="" style="max-width: 100%; box-sizing: border-box; word-wrap: break-word !important;"><p style="max-width: 100%; min-height: 1em; white-space: pre-wrap; text-align: justify; box-sizing: border-box !important; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; box-sizing: border-box !important; word-wrap: break-word !important;"></span></p><p style="max-width: 100%; min-height: 1em; white-space: pre-wrap; text-align: justify; box-sizing: border-box !important; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; box-sizing: border-box !important; word-wrap: break-word !important;"></span></p><p style="max-width: 100%; min-height: 1em; white-space: pre-wrap; text-align: justify; box-sizing: border-box !important; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; box-sizing: border-box !important; word-wrap: break-word !important;">&nbsp; &nbsp; 彩超</span><span style="max-width: 100%; font-family: 宋体; box-sizing: border-box !important; word-wrap: break-word !important;">开机自检失败，机器起动不起来。打开机器前端盖，给机器送电后，测量机器直流工作电压，<span style="">VP2</span>电压等于<span style="">+3.8V</span>，正常值<span style="">VP2=+V5</span>。因为此组电源与彩超前端板及通道板有关，所以先拔下探头，然后开机，机器仍然起动不起来。</span></p><p style="max-width: 100%; min-height: 1em; white-space: pre-wrap; text-align: justify; box-sizing: border-box !important; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; box-sizing: border-box !important; word-wrap: break-word !important;">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="max-width: 100%; font-family: 宋体; box-sizing: border-box !important; word-wrap: break-word !important;">查机器前端通道板<span style="">CB0-CB8</span>共八块，先拔下其中<span style="">4</span>块，再开机，机器自检通过，检测<span style="">VP2=+5V</span>不变。恢复前端通道板当其超过<span style="">5</span>块，起动机器，<span style="">VP2</span>电压就低于<span style="">4.5V</span>，有时低至<span style="">4.3V</span>，机器自检不能通过，就出现“死机”故障。</span></p><p style="max-width: 100%; min-height: 1em; white-space: pre-wrap; text-align: justify; box-sizing: border-box !important; word-wrap: break-word !important;"><span style="max-width: 100%; font-family: 宋体; box-sizing: border-box !important; word-wrap: break-word !important;">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="max-width: 100%; font-family: 宋体; box-sizing: border-box !important; word-wrap: break-word !important;">分析原因，是否<span style="">VP2</span>直流十<span style="">5V</span>电源带载能力差引起的“死机”问题<span style=""></span>联系飞利浦厂家，借来新电源箱，试机<span style="">VP2=+5V</span>不变，机器自检通过，工作正常，“死机”故障排除。所以认为此故障是<span style="">VP2</span>电源带载能力差，引起在开机过程中<span style="">+5V</span>电源压降大，从而引起开机自检不过，出现“死机”故障。</span></p><p><span style="max-width: 100%; font-family: 宋体; box-sizing: border-box !important; word-wrap: break-word !important;"><br  /></span></p></section></section></section></section><p><br  /></p><p style="line-height: 25.6px; max-width: 100%; min-height: 1em; white-space: pre-wrap; color: rgb(62, 62, 62); box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: Arial, Verdana, sans-serif; font-size: 14px; line-height: 24px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(249, 249, 249);">广州市设备维修有限公司</span></p><p style="max-width: 100%; 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