電纜 R2X1N1N0A1T0A
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(chǎng)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。
電纜 R2X1N1N0A1T0A
R2X2N1A1A1T0A |
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R2X1N1U1B1T0F |
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R2U0N1C0B1T0F |
R2X0N1A0A1T0A |
1C31113G05 |
1C31113G06 |
1C31116G01 |
1C31116G02 |
1C31116G03 |
1C31125G01 |
1C31125G03 |
1C31129G01 |
1C31129G02 |
1C31129G04 |
1C31142G01 |
1C31147G01 |
1C31147G02 |
1C31150G01 |
1C31150G02 |
1C31150G03 |
1C31157G01 |
1C31157G02 |
1C31157G03 |
1C31169G01 |
1C31169G02 |
1C31174G01 |
1C31174G02 |
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1C31174G04 |
1C31177G01 |
1C31177G02 |
1C31177G03 |
1C31181G01 |
1C31181G03 |
1C31181G04 |
1C31194G02 |
1C31197G02 |
1C31197G03 |
1C31197G04 |
1C31199G01 |
1C31199G02 |
1C31199G03 |
1C31201G01 |
1C31201G02 |
1C31203G01 |
1C31204G01 |
1C31204G03 |
1C31205G01 |
1C31206G01 |
1C31222G01 |
1C31222G01 |
1C31223G01 |
1C31224G02 |
1C31227G02 |
1C31232G01 |
1C31232G02 |
1C31232G03 |
1C31233G01 |
1C31233G02 |
1C31233G03 |
1P00028G01 |
1X00014H01 |
1X00046H01 |
1X00046H02 |
1X00055H01 |
1X00061H01 |
1X00093G42 |