焊接問題
如果我想檢查一粒電阻, 或者電容, 有冇虛焊/焊得好唔好的話, 可以點CHECK? 基本用眼睇 BGA soldering use IR and X-Ray to detect. 這裡http://wenku.baidu.com/view/7d83251ea300a6c30c229fe8.html?from=rec&pos=0&weight=28&lastweight=10&count=5 本帖最後由 ayuen 於 2012-1-23 15:12 編輯
我N年前學銲嘢阿sir咁教,跟大家分享一下:
- 用1000grit沙紙fine sand下的電容電阻腳
- 以前的鍍金底板都會生銹!要用擦膠擦下至銲!而家鍍金底板應該好好,不過都建議清潔一下至銲!現今應該有清潔液,請各C兄介紹一下邊隻好用
- low resistance check: (唔多識點用中文寫,見諒)Multimeters have a continuity setting that probe for low resistances (short circuit). The symbol for a continuity test is usually a diode with dot emitting sound, indicating that if the meter detects short circuit, it will play a tone. Probe the 2 components after soldering and you should hear the dot sound waves. 多問一句底板還是搭棚 For low resistance check, 搭棚的零件腳容易probe到.底板如果真係probe唔到其中一隻的零件腳會試搵其他connecting point...所以幾時都應該清潔下的零件及底板增加bonding效果。
頁:
[1]