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<p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">在无任何原理图状况下要对一块比较陌生的电路板进行维修，以往的所谓“经验”就难有作为，尽管硬件功底深厚的人对维修充满信心，但如果方法不当，工作起来照样事倍功半。那么，怎样做才能提高维修效呢？</p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><br /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">方法一：先看后量<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;" /></span>用工具：万用表、放大镜<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">当手拿一块待修的电路板，良好的习惯首先是应对其进行目测，必要时还要借助放大镜，看什么呢？主要看<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">1</span>、是否有断线；<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">2</span>、分力元件如电阻、电解电容、电感、二极管、三极管等时候存在断开现象；<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">3</span>、电路板上的印制板连接线是否存在断裂、粘连等；<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">4</span>、是否有人修过？动过哪些元器件？是否存在虚焊、漏焊、插反等操作方面的失误；在确定了被修无上述状况后，首先用万用表测量电路板电源和地之间的阻值，通常电路板的阻值都在<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">70-80</span>？以上，若阻值太小，才几个或十几个欧姆，说明电路板上有元器件被击穿或部分击穿，就必须采取措施将被击穿的元器件找出来。具体办法是给被修板供电，用手去摸电路板上各器件的温度，烫手的讲师重点怀疑对象。若阻值正常，用万用表测量板上的阻、二极管、三极管、场效应管、拨段开关等分力元件，其目的就是首先要确保测量过的元件是正常的，我们的理由是，能用万用表解决的问题，就不要把它复杂化。<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><br /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">方法二：先外后内</p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">使用工具：电路在线维修仪<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">如果情况允许，最好是找一块与被维修板一样的好板作为参照，然后使用一起的双棒<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">VI</span>曲线扫描功能对两块板进行好、坏对比测试，起始的对比点可以从端口开始，然后由表及里，尤其是对电容的对比测试，可以弥补万用表在线难以测出是否漏电的缺憾。<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: center;"><br /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">方法三：先易后难<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;" /></span>使用工具：电路在线维修仪、电烙铁、记号笔<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">为提高测试效果，在对电路板进行在线功能测试前，应对被修板做一些技术处理，以尽量削弱各种干扰对测试进程带来的负面影响。具体措施是：<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">1</span>、测试前的准备<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">将晶振短路<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>对大的电解电容要焊下一条脚使其开路，因为电容的充放电同样也能带来干扰。<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">2</span>、采用排除法对器件进行测试<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">对器件进行在线测试或比较过程中，凡是测试通过（或比较正常）的器件，请直接确认测试结果，以便记录；对测试未通过（或比较超差）的，可再测试一遍，若还是未通过，也可先确认测试结果，就这样一直测试下去，直到将板上的器件测试（或比较）完，然后再回过头来处理那些未通过测试（或比较超差）的器件。对未通过功能在线测试的器件，仪器还提供了一种不太正规却又比较实用的处理方法，由于仪器对电路板的供电可以通过测试夹施加到器件相应的电源与地脚，若对器件的电源脚实施刃割，则这个器件将脱离电路板供电系统，这时再对该器件进行在线功能测试，由于电路板上的其他器件将不会再起干扰作用，实际测试效果等同于“准离线”，测准率将获得很大提高。<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">3</span>、用<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">ASA-VI</span>曲线扫描测试对测试库尚未涵盖的器件进行比较测试<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;">由于<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">ASA-VI</span>智能曲线扫描技术能适用于对任何器件的比较测试，只要测试夹能将器件夹住，再有一块参照板，通过对比测试，同样对器件具备较强的故障侦测能力。该功能弥补了器件在线功能测试要受制于测试库的不足，拓展了仪器对电路板故障的侦测范围。现实中往往会出现无法找到好板做参照的情景，而且待修板本身的电路结构也无任何对称性，在这种情况下，<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">ASA-VI</span>曲线扫描比较测试功能起不了作用，而在线功能测试由于器件测试库的不完全，无法完成对电路板上每一个器件都测试一遍，电路板依然无法修复，这儿就是电路在线维修仪的局限，就跟没有包治百病的药一样。</p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; line-height: 25.6px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important; text-align: left;"><br /></p><p style="white-space: normal; line-height: 24.381px;"><span style="color: rgb(62, 62, 62); font-family: Arial, Verdana, sans-serif; line-height: 1.75em; text-indent: 0em; 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 </span><span style="color: rgb(62, 62, 62); font-family: Arial, Verdana, sans-serif; text-indent: 0em; max-width: 100%; font-size: 14px; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important;"> </span><br /></p><p style="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><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="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><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 </span></p><p style="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">传真：020-8722 8623</span></p><p style="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><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="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><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="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><img data-ratio="1" src="http://mmbiz.qpic.cn/mmbiz/dx3KibwtDhvfCZvZq5PcthnDKlnnq3AalhbichW77J3B70osicTickklZybNKUZqc44DZ0oaWaHm2p0TaA9478icwPg/640?wx_fmt=jpeg" data-type="jpeg" data-w="120" width="auto" style="box-sizing: border-box !important; word-wrap: break-word !important; visibility: visible !important; width: auto !important;" /></p><p style="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><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="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><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="font-size: 16px; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 24.381px; text-align: justify; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span style="font-size: 14px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; text-indent: 0em;">软件咨询：QQ: 712638 406</span><br /></p><p style="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><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="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><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="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">网址：http://www.yiliaoshebeiweixiu.com</span></p><p style="text-indent: 0em; white-space: normal; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">电子邮箱：service@yiliaoshebeiweixiu.com</span></p><p><br /></p>
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发表于 2020-10-19 23:30:06