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<p><img data-type="gif" src="http://mmbiz.qpic.cn/mmbiz_gif/dx3KibwtDhvc6YBndBzrYvfAVPCGNAlsqB9f7SjRnXkibcO3P2CSjz7TnOO8RAArOGOjobic1D5DCTCzzAoxv9jfw/0?wx_fmt=gif" data-ratio="0.1703125" data-w="640" /></p><p><br /></p><p><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-size: 14px; line-height: 21px; text-align: justify; text-indent: 28px;"> B超机的电源故障、发射/接收板和CPU板及其他的故障，在B超机故障率中分别大约占有70%、20%和10%的比率，这是B超机的故障排除中不容忽视的问题，所以对B超机电源技术进行深入地了解、掌握一些现代电源的工作原理和维修方法，是保证B超机正常工作和快速修复的必要手段。</span><br /></p><p><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-size: 14px; line-height: 21px; text-align: justify; text-indent: 28px;"><br /></span></p><p><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-size: 14px; line-height: 21px; text-align: justify; text-indent: 28px;"><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;">维修中易陷入的误区</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> 例1：当数字扫描转换器(DSC)中的+5V数字电源无输出时，就会在通电开机时自检通不过，键盘锁死故障，现象相同于一般设备维修中CPU板的故障。如果电源故障不排除，就不要轻易去动CPU主板。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> 例2：当发射/接收(T/R)板的高压电源和数个低压电源中其中之一不正常时，也会显示出T/R板有故障等，即电源故障被隐藏在有关功能电路板后面。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> 例3：当数字电源的电压飘移且超出芯片的工作电压范围时，系统也会报出CPU板等故障。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> 例4：当系统显示类似“T/R ERR0R SHUT DOWN”，即发射电路、探头、脉冲电源故障时，切忌连续和长时间开机通电，避免扩大故障。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> </span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> 电源的测量与检查</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> 拆机后有针对性的检查电源电压。如果某些电压低于正常值，首先通过拔去或插回某一电路板插接件来判断故障在哪块电路板上，这种方法对检查一些故障特别是电源过载故障是一种简单而十分有效的方法。如果拔去某一电路板电源恢复正常，则证明该电路板有短路，否则是电源有问题。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> (1)电路板有电源过载故障检查方法。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> 如果检查出电路板有电源过载故障，可先仔细观察元器件表面，察看是否有裂痕、漏液和过电压过电流痕迹，而后酌情处理。有时元器件表面看不到痕迹，一块电路板上焊接有几百只元器件或IC芯片，这时候可用本机电源或者外接稳压电源串接合适阻值的限流电阻，通电后快速触摸元器件或IC芯片的方法来找出短路元器件或IC芯片。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> (2)电源检查到IC芯片。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> 有些电路板上有电源保护元件，当保护元件开路后，工作电压施加不到IC芯片上，此时B超机测量和判断系统可能会报出某些范围的故障代码。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> (3)某些B超机的探头高压具有检测电路，只有在插入探头后才有输出，未插入探头而测量电源高压很可能会做出错误的判断。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> (4)在电源维修中，更换元件时原则上要选用相同的型号;当采用其他型号取代时，必须查清有关参数，确定符合后才能替换。替换元器件的耐压、电流参数尽量选大一些。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> (5)无论环境好坏，电源内部都会累积灰尘。如果灰尘积聚到一定程度，就会影响器件的散热。因为B超机是连续工作的设备，定期除尘有利于机器的正常工作。电子线路的可靠性设计中有一条重要法则：温度增加10℃，可靠性要降低一倍。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> 当温度增加时，高压器件的绝缘会降低，元器件的参数会发生变化，引起级间电路工作点的温度飘移，轻者造成电压或电流有波动，重者会使设备无法工作。因此要极为重视医用仪器和设备的除尘和降温。</span><br style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal; white-space: normal;" /><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"> (6)检修者必须能熟练掌握各种B超机的操作，能运用基本操作，这是维修B超机的必备条件。</span></span></p><p><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-size: 14px; line-height: 21px; text-align: justify; text-indent: 28px;"><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; line-height: normal;"></span></span></p><p><img data-s="300,640" data-type="jpeg" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvfQdQp354lXsfUY07982sI7adVmMqleyYW2OGlKkzVlPNvZwvsaBu216Zjvrppic2zqjiceoIbvZFicg/0?wx_fmt=jpeg" data-ratio="0.6646942800788954" data-w="507" /></p><p><br /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 16px; white-space: normal; line-height: 25.6px; 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; line-height: 1.75em; text-indent: 0em; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">地址：广州市天河区银利街银利茶叶博览中心E栋4楼E4030室 </span><span style="max-width: 100%; font-family: Arial, Verdana, sans-serif; text-indent: 0em; font-size: 14px; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important;"> </span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); text-indent: 0em; white-space: normal; font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important;">邮编：510507</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); text-indent: 0em; white-space: normal; font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; 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font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">全国统一免费服务热线：400-020-6788</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); text-indent: 0em; white-space: normal; font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 16px; line-height: 24.381px; font-family: 'Helvetica Neue', Helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; box-sizing: border-box !important; word-wrap: break-word !important;">公司官网：http://gb.parts-ultrasound.com/</span><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 16px; white-space: normal; line-height: 24.381px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; line-height: 1.75em; text-indent: 0em; font-size: 14px; font-family: Arial, Verdana, sans-serif; box-sizing: border-box !important; word-wrap: break-word !important;">微信公众帐号：</span></p><p><img data-s="300,640" data-type="jpeg" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvfh2wVX4NftfnfjcZWIKK6EQDWtTTsYwjfQBnsqkThAZP5OlDmg5S3g22gSqMWhAxr2O4MydSJHnQ/0?wx_fmt=jpeg" data-ratio="1" data-w="258" /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); text-indent: 0em; white-space: normal; font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">维修咨询：QQ: 712638 404</span><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;" /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); text-indent: 0em; white-space: normal; font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">设备咨询: QQ: 712638 405</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 16px; white-space: normal; line-height: 24.381px; text-align: justify; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; text-indent: 0em; box-sizing: border-box !important; word-wrap: break-word !important;">软件咨询：QQ: 712638 406</span><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;" /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); text-indent: 0em; white-space: normal; font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">配件咨询：QQ: 712638 407</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); text-indent: 0em; white-space: normal; font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">交流Q群：1106 11074</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); text-indent: 0em; white-space: normal; font-size: 12px; font-family: Arial, Verdana, sans-serif; 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line-height: normal;"><br /></span></span><br /></p><p><span style="font-family: 'Microsoft YaHei', 微软雅黑, STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-size: 14px; line-height: 21px; text-align: justify; text-indent: 28px;"><br /></span></p>
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发表于 2020-10-19 23:21:55