140GGECM4 通訊模塊
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:
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(kāi)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(guò)?動(dòng)過(guò)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(wú)上述狀況后,首先用萬(wàn)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(shuō)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(lái)。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(wàn)用表測(cè)量板上的阻、二極管、三極管、場(chǎng)效應(yīng)管、撥段開(kāi)關(guān)等分力元件,其目的就是首先要確保測(cè)量過(guò)的元件是正常的,我們的理由是,能用萬(wàn)用表解決的問(wèn)題,就不要把它復(fù)雜化。
140GGEA2R1A |
140GGEAM1B |
140GGECM |
140GGECM4 |
140GGELP1603 |
140GGELP1604 |
140GGEOPA |
140GGEOPB |
140GGEOPC |
140GGEOPD |
140GGEOPJ |
140GGEOPKY |
140GGEP3 |
140GGEP4 |
140GGEXS3 |
140GGEXS4 |
140GGEXT3 |
140GGEXT4 |
140GGEZ |
140GGFCS04 |
140GGFCS06 |
140GGFCX03 |
140GGFCX04 |
140GGFCX06 |
140GGFCX10 |
140GGFMX03 |
140GGFMX04 |
140GGFMX06 |
140GGFMXB03 |
140GGFMXB04 |
140GGMH3 |
140GGMH4 |
140GGMTL63 |
140GGMTL64 |
140GGNVM12B |
140GGNVM12R |
140GGNVM21B |
140GGNVM21R |
140GGOSB |
140GGPB3H |
140GGPB3L |
140GGPB3M |
140GGPB4H |
140GGPB4L |
140GGPB4M |
140GGPL |
140GGPRA |
140GGRMB |
140GGRMX |
140GGRMY |
140GGRVM12B |
140GGRVM12R |
6SN1130-1AA11-0AA0 |
6SN1130-1AA11-0CA0 |
6SN1130-1AA11-0DA0 |
6SN1130-1AA11-0EA0 |
6SN1130-1AA11-0FA0 |
6SN1130-1AA11-0GA0 |
6SN1130-1AA12-0AA0 |
6SN1130-1AA12-0CA0 |
6SN1130-1AA12-0DA0 |
6SN1130-1AA12-0EA0 |
6SN1130-1AA12-0FA0 |
6SN1130-1AA12-0GA0 |
6SN1130-1AD11-0AA0 |
6SN1130-1AD11-0BA0 |
6SN1130-1DA11-0AA0 |
6SN1130-1DA11-0DA0 |
6SN1130-1DA11-0EA0 |
6SN1130-1DA11-0FA0 |
6SN1130-1DA11-0HA0 |
6SN1130-1DA12-0AA0 |
6SN1130-1DA12-0BA0 |
6SN1130-1DA12-0CA0 |
6SN1130-1DA12-0DA0 |
6SN1130-1DA12-0HA0 |
6SN1130-1DA13-0AA0 |
6SN1130-1DA13-0BA0 |
6SN1130-1DA13-0CA0 |
6SN1130-1DA13-0DA0 |
6SN1130-1DA13-0EA0 |
6SN1130-1DG12-0HA0 |
6SN1130-1DG13-0AA0 |
6SN1130-1DG13-0BA0 |
6SN1130-1DG13-0CA0 |
6SN1130-1DG13-0EA0 |
6SN1130-1DG13-0FA0 |
6SN1130-1DG13-0GA0 |
6SN1130-1DG13-0HA0 |
6SN1135-1BA11-0CA0 |
6SN1135-1BA11-0DA0 |
6SN1135-1BA11-0EA0 |
6SN1135-1BA11-0FA0 |
6SN1135-1BA11-0GA0 |
140GGECM4 通訊模塊