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<p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; text-align: center; line-height: 19.5pt; background-color: rgb(255, 255, 255); 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-size: 20px; box-sizing: border-box !important; word-wrap: break-word !important;">维修技巧之三</span></strong></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;">用万能表检测电路板<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></span></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><br /></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">1.</span>离线检测<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></span></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;">测出<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>芯片各引脚对地之间的正<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>反电阻值<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>以此与好的<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>芯片进行比较<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>从而找到故障点<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><br /></span></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">2.</span>在线检测<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><br /></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">1)</span>直流电阻的检测法<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;">同离线检测<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>但要注意<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(a)</span>要断开待测电路板上的电源<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(b)</span>万能表内部电压不得大于<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">6V;<o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(c)</span>测量时<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>要注意外围的影响<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>如与<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>芯片相连的电位器等<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><br /></span></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">2)</span>直流工作电压的测量法<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;">测得<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>芯片各脚直流电压与正常值相比即可<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>但也要注意：<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(a)</span>万能表要有足够大的内阻<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>数字表为首选<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(b)</span>各电位器旋到中间位置<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(c)</span>表笔或探头要采取防滑措施<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>可用自行车气门芯套在笔头上<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">, </span>并应长出笔尖约<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">5mm;<o:p style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"></o:p></span></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(d)</span>当测量值与正常值不相符时<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>应根据该引脚电压<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>对<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>芯片正 常值有无影响以及其它引脚电压的相应变化进行分析<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(e)IC</span>芯片引脚电压会受外围元器件的影响<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>当外围有漏电<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>短路<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">, </span>开路或变质等<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(f)IC</span>芯片部分引脚异常时<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>则从偏离大的入手<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>先查外围元器件<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">, </span>无故障<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>则<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>芯片损坏<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(g)</span>对工作时有动态信号的电路板<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>有无信号<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>芯片引脚电压是不 同的<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>但若变化不正常则<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>芯片可能已坏<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(h)</span>对多种工作方式的设备<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>在不同工作方式时<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>脚的电压是不同 的<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><br /></span></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">3)</span>交流工作电压测试法<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;">用带有<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">dB</span>档的万能表<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>对<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>进行交流电压近似值的测量<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>若没有<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">dB</span>档<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>则可在正表笔串入一只<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">0.1-0.5</span>μ<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">F</span>隔离直流电容<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>该方法适用于工作频率比较低的<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC.</span>但要注意这些信号将受固有频率<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>波形不同而不同<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>所以所测数据为近似值<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>仅供参考<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"><br /></span></p><p style="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;"><span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">4)</span>总电流测量法<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="margin: 0pt; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-family: 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif; font-size: 16px; white-space: normal; widows: 1; line-height: 19.5pt; background-color: rgb(255, 255, 255); box-sizing: border-box !important; word-wrap: break-word !important;">通过测<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>电源的总电流<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>来判别<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>的好坏<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>由于<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>内部大多数为直流耦合<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,IC</span>损坏时<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">(</span>如<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">PN</span>结击穿或开路<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">)</span>会引起后级饱和与截止<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>使总流发生变化<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>所以测总电流可判断<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">IC</span>的好坏<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>在线测得回路电阻上的电压<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>即可算出电流值来<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">. </span>以上检测方法<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">,</span>各有利弊<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>在实际应用中将这些方法结合来运用<span lang="EN-US" style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;">.</span>运用好了就能维修好各种电路板。</p><p><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 23:29:59