R88M-GP20030T-S2-Z 接觸器
在無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:
1、是否有斷線;
2、分力元件如電阻、電解電容、電感、二極管、三極管等時(shí)候存在斷開現(xiàn)象;
3、電路板上的印制板連接線是否存在斷裂、粘連等;
4、是否有人修過?動(dòng)過哪些元器件?是否存在虛焊、漏焊、插反等操作方面的失誤;
在確定了被修無上述狀況后,首先用萬用表測(cè)量電路板電源和地之間的阻值,通常電路板的阻值都在70-80?以上,若阻值太小,才幾個(gè)或十幾個(gè)歐姆,說明電路板上有元器件被擊穿或部分擊穿,就必須采取措施將被擊穿的元器件找出來。具體辦法是給被修板供電,用手去摸電路板上各器件的
溫度,燙手的講師重點(diǎn)懷疑對(duì)象。若阻值正常,用萬用表測(cè)量板上的阻、二極管、三極管、場效應(yīng)管、撥段開關(guān)等分力元件,其目的就是首先要確保測(cè)量過的元件是正常的,我們的理由是,能用萬用表解決的問題,就不要把它復(fù)雜化。
R88M-GP20030T-S2-Z 接觸器
R88M-GP10030T-O-Z |
R88M-GP10030T-S2-Z |
R88M-GP10030T-Z |
R88M-GP20030H-BOS2-Z |
R88M-GP20030H-BO-Z |
R88M-GP20030H-BS2-Z |
R88M-GP20030H-B-Z |
R88M-GP20030H-OS2-Z |
R88M-GP20030H-O-Z |
R88M-GP20030H-S2-Z |
R88M-GP20030H-Z |
R88M-GP20030T-BOS2-Z |
R88M-GP20030T-BO-Z |
R88M-GP20030T-BS2-Z |
R88M-GP20030T-B-Z |
R88M-GP20030T-OS2-Z |
R88M-GP20030T-O-Z |
R88M-GP20030T-S2-Z |
R88M-GP20030T-Z |
R88M-GP40030H-BOS2-Z |
R88M-GP40030H-BO-Z |
R88M-GP40030H-BS2-Z |
R88M-GP40030H-B-Z |
R88M-GP40030H-OS2-Z |
R88M-GP40030H-O-Z |
R88M-GP40030H-S2-Z |
R88M-GP40030H-Z |
R88M-GP40030T-BOS2-Z |
R88M-GP40030T-BO-Z |
R88M-GP40030T-BS2-Z |
R88M-GP40030T-B-Z |
R88M-GP40030T-OS2-Z |
R88M-GP40030T-O-Z |
R88M-GP40030T-S2-Z |
R88M-GP40030T-Z |
R88M-K05030H |
R88M-K05030H-BOS2-Z |
R88M-K05030H-BO-Z |
R88M-K05030H-BS2-Z |
R88M-K05030H-B-Z |
R88M-K05030H-OS2-Z |
R88M-K05030H-O-Z |
R88M-K05030H-S2-Z |
R88M-K05030H-Z |
R88M-K05030T-BOS2-Z |
R88M-K05030T-BO-Z |
R88M-K05030T-BS2-Z |
R88M-K05030T-B-Z |
R88M-K05030T-OS2-Z |
R88M-K05030T-O-Z |
R88M-K05030T-S2-Z |
R88M-K05030T-Z |
R88M-K10030H-BOS2-Z |
R88M-K10030H-BO-Z |
R88M-K10030H-BS2-Z |
R88M-K10030H-B-Z |
R88M-K10030H-OS2-Z |
R88M-K10030H-O-Z |
R88M-K10030H-S2-Z |
R88M-K10030H-Z |
R88M-K10030L |
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