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<p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: 宋体; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"> 先电路板后电路单元。在<span style="">B</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">超机中，一般是几个功能电路单元做在一块电路板上，整机由数块电路板组成，检修时首先要把故障确定在哪块电路板上。</span></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: 宋体; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"> 最常用的方法有：</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; color: rgb(0, 128, 255); font-size: 18px; box-sizing: border-box !important; word-wrap: break-word !important;"><strong style="max-width: 100%; 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;"> 1<span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">、</span>拔插法</span></strong></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: 宋体; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"> 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；</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; color: rgb(0, 128, 255); font-size: 18px; box-sizing: border-box !important; word-wrap: break-word !important;"><strong style="max-width: 100%; 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;"> 2<span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">、</span>代换法</span></strong></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: 宋体; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"> 如果有相同型号的<span style="">B</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">超</span>（有些同厂不同型号的<span style="">B</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">超维修，一些电路板也相同</span>）或有备用的电路板，可采用代换法判断故障与哪块（或哪几块）电路板有关，若用正常电路板代换所怀疑的电路板后仪器恢复正常，说明被怀疑的电路板有故障，这样可大大节省时间。注意在采用代换法之前，首先要考虑实际存在的故障是否会损坏替换物，其中主要考虑供给替换电路板的电压是否正常，另外对一些大功率、大电流和高电压组件代换时要特别小心。</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: 宋体; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"><span style=""></span></span></p><p style="text-align:center"><img data-s="300,640" data-type="jpeg" src="http://mmbiz.qpic.cn/mmbiz/dx3KibwtDhvedEd2WfmNcgDiaL20JPU1gY53cfLGj4uLtgtLhsic5oRsRNbGkNSL6UTuibUEt5K8s6gUzCo73A49vw/0?wx_fmt=jpeg" data-ratio="0.7978723404255319" data-w="376" /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: 宋体; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"><span style=""> </span><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;" /> 把故障缩小到单元电路板后，此后的工作就是要根据故障现象结合电路图分析造成故障的原因和可能损坏的器件，检查单元电路的方法很多，在此列举最常用的几种方法</span><br /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: 宋体; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"> <strong style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"> （<span style="">1</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">）</span>电阻测量法：</strong>通过测量电路节点的电阻值，然后与正常值（或根据电路分析得出的电阻值范围）比较判断电路是否正常。</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: 宋体; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"> <strong style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">（2）电流测量法：</strong>通过测量电路节点的电流值是否与正常的电流值范围相符来判断单元电路正常与否。</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: 宋体; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;"> <strong style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"> （3）电压测量法：</strong>通过测量一些特征电路的电压值来判断电路是否正常，电压测量法因其方便直观、简单易行而大受欢迎，成为电子设备维修行业中最常用的方法。<span style=""> </span><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;" /><strong style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"> （<span style="">4</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">）</span>波形测量法：</strong>通过观察特征电路的波形，把它与正常值比较来判断故障。采用此法时要注意<span style="">B</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">超维修在不同工作模式下的波形不一样，在进行比较时一定要使用同一工作模式。</span><span style=""> </span><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;" /><strong style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"> （<span style="">5</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">）</span>元件代换法：</strong>此方法也常常被采用，当怀疑某一元件时，用一好的元件代换后再试机，也能节省很多时间，特别是当被怀疑元件是电容或带插座的集成块时，因电容的一些参数如损耗角等不易测量、集成块测量起来麻烦且易造成短路，所以采用代换法非常有效。<span style=""> </span><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;" /><strong style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"> （<span style="">6</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">）</span>信号追踪法：</strong>采用分割电路追踪信号来分析故障的方法，能快速大致确定故障部位。以上的各<span style="">B</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">超维修步骤之间、检修方法之间、步骤和方法之间都不是相互孤立的，而是统一的，在维修中要把它们有机地结合起来，交错合理运用，找出解决问题的最佳方案。维修是一个理论和实践相结合的过程，因此要注意积累平时的一些</span><span style="">B</span><span style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">超维修经验并加以总结，为日后解决问题创造条件。</span></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 22.2609px; 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;"> </span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); 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; 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%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; line-height: 24px; font-family: Arial, Verdana, sans-serif; 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;">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 邮编：510507</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; line-height: 24px; font-family: Arial, Verdana, sans-serif; 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;">电话：(+86)020-8722 8723 8764 5360 8764 2943 传真：020-8722 8623</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; line-height: 24px; font-family: Arial, Verdana, sans-serif; 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;">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); font-size: 12px; line-height: 24px; font-family: Arial, Verdana, sans-serif; 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;">微信公众帐号：</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; line-height: 24px; font-family: Arial, Verdana, sans-serif; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><img data-ratio="1" data-type="jpeg" data-w="120" width="auto" src="http://mmbiz.qpic.cn/mmbiz/dx3KibwtDhvfCZvZq5PcthnDKlnnq3AalhbichW77J3B70osicTickklZybNKUZqc44DZ0oaWaHm2p0TaA9478icwPg/640?wx_fmt=jpeg" style="box-sizing: border-box !important; word-wrap: break-word !important; width: auto !important; visibility: visible !important;" /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; line-height: 24px; font-family: Arial, Verdana, sans-serif; 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></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; line-height: 24px; font-family: Arial, Verdana, sans-serif; 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: 12px; line-height: 24px; font-family: Arial, Verdana, sans-serif; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; 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发表于 2020-10-19 23:55:37