威格士EEA-PAM-513-A-32 現(xiàn)貨
了解在線測(cè)試儀的讀者，均知道有這么一句行話�！霸诰�測(cè)試時(shí)不通過(guò)的芯片不一定是損壞的；測(cè)試通過(guò)的芯片一定是沒(méi)有損壞的。”它的解釋為，如器件受在線影響或抗干擾時(shí)，結(jié)果可能不通過(guò)，對(duì)此不難理解。那么，是否損壞的芯片在進(jìn)行測(cè)試時(shí)，均會(huì)得出“不通過(guò)”呢？回答確實(shí)不能肯定。筆者與同行均遇到過(guò)，明明芯片已損壞了（確切地說(shuō)換上這個(gè)芯片板子就不工作了），但測(cè)試結(jié)果是通過(guò)的。權(quán)威解釋為這是測(cè)試儀自身工作原理（后驅(qū)動(dòng)技術(shù)）所致。故此我們不能過(guò)分依賴在線測(cè)試儀（盡管各廠家宣傳的很玄）的作用，否則將使維修電路板的工作誤入歧途。
維修技巧之二
在無(wú)任何原理圖狀況下要對(duì)一塊比較陌生的電路板進(jìn)行維修，以往的所謂“經(jīng)驗(yàn)”就難有作為，盡管硬件功底深厚的人對(duì)維修充滿信心，但如果方法不當(dāng)，工作起來(lái)照樣事倍功半。那么，怎樣做才能提高維修效呢？根據(jù)我公司進(jìn)口設(shè)備維修中心統(tǒng)計(jì)出來(lái)的資料，應(yīng)遵循以下幾個(gè)步驟、按順序有條不紊的進(jìn)行。
方法一：先看后量
使用工具：萬(wàn)用表、放大鏡
當(dāng)手拿一塊待修的電路板，良好的習(xí)慣首先是應(yīng)對(duì)其進(jìn)行目測(cè)，必要時(shí)還要借助放大鏡，看什么呢？
主要看
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