科啟達電子回收18年,價高同行,誠信報價
求購工廠庫存,抵債,清倉,轉行,庫存積壓電子料,購銷一切庫存數(shù)碼產(chǎn)品,各式各樣耳機,手機,電腦,充電器,電源適配器,高清線,充電線,移動電源,藍牙音響,電池,音響,鍵盤,電子料,各種lc,DDR,原包散新帶板等等一切電子產(chǎn)品元器件,中介重酬,打擾之處請諒解!謝謝!
5、要保證焊接質量
焊接時確實焊牢,焊錫的堆積、氣孔容易造成虛焊。焊接時間一般不超過3秒鐘,烙鐵的功率應用內(nèi)熱式25W左右。已焊接好的集成電路要仔細查看,用歐姆表測量各引腳間有否短路,確認無焊錫粘連現(xiàn)象再接通電源。
6、不要輕易斷定集成電路的損壞
不要輕易地判斷集成電路已損壞。因為集成電路絕大多數(shù)為直接耦合,一旦某一電路不正常,可能會導致多處電壓變化,而這些變化不一定是集成電路損壞引起的,另外在有些情況下測得各引腳電壓與正常值相符或接近時,也不一定都能說明集成電路就是好的。因為有些軟故障不會引起直流電壓的變化。
7、測試儀表內(nèi)阻要大
測量集成電路引腳直流電壓時,應選用表頭內(nèi)阻大于20KΩ/V的萬用表,否則對某些引腳電壓會有較大的測量誤差。
8、要注意功率集成電路的散熱
功率集成電路應散熱良好,不允許不帶散熱器而處于大功率的狀態(tài)下工作。
9、引線要合理
如需要加接外圍元件代替集成電路內(nèi)部已損壞部分,應選用小型元器件,且接線要合理以免造成不必要的寄生耦合,尤其是要處理好音頻功放集成電路和前置放大電路之間的接地端。
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