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.組合代換  
組合代換就是把同一型號(hào)的多塊IC內(nèi)部未受損的電路部分，重新組合成一塊完整的IC，用以代替功能不良的IC的方法。對(duì)買(mǎi)不到原配IC的情況下是十分適用的。但要求所利用IC內(nèi)部完好的電路一定要有接口引出腳。  
非直接代換關(guān)鍵是要查清楚互相代換的兩種IC的基本電參數(shù)、內(nèi)部等效電路、各引腳的功能、IC與外部元件之間連接關(guān)系的資料。實(shí)際操作時(shí)予以注意：  
⑴集成電路引腳的編號(hào)順序，切勿接錯(cuò)；  
⑵為適應(yīng)代換后的IC的特點(diǎn)，與其相連的外圍電路的元件要作相應(yīng)的改變；  
⑶電源電壓要與代換后的IC相符，如果原電路中電源電壓高，應(yīng)設(shè)法降壓；電壓低，要看代換IC能否工作。  
⑷代換以后要測(cè)量IC的靜態(tài)工作電流，如電流遠(yuǎn)大于正常值，則說(shuō)明電路可能產(chǎn)生自激，這時(shí)須進(jìn)行去耦、調(diào)整。若增益與原來(lái)有所差別，可調(diào)整反饋電阻阻值；  
⑸代換后IC的輸入、輸出阻抗要與原電路相匹配；檢查其驅(qū)動(dòng)能力。  
⑹在改動(dòng)時(shí)要充分利用原電路板上的腳孔和引線(xiàn),外接引線(xiàn)要求整齊，避免前后交叉，以便檢查和防止電路自激，特別是防止高頻自激;  
[7]在通電前電源Vcc回路里再串接一直流電流表，降壓電阻阻值由大到小觀察集成電路總電流的變化是否正常。

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電力設(shè)備分為一次設(shè)備和二次設(shè)備，一次設(shè)備指直接承擔(dān)發(fā)電、輸電、變電、配電、用電功能的設(shè)備，如發(fā)電機(jī)、變壓器等，技術(shù)含量較低，國(guó)內(nèi)生產(chǎn)廠家較多，競(jìng)爭(zhēng)激烈。二次設(shè)備指為了一次設(shè)備正常運(yùn)轉(zhuǎn)和實(shí)現(xiàn)對(duì)電的管理目標(biāo)所需的各種設(shè)備，如發(fā)電機(jī)組保護(hù)、調(diào)度自動(dòng)化系統(tǒng)。同一次設(shè)備相比，二次設(shè)備的生產(chǎn)具有較高的行業(yè)壁壘，該行業(yè)的產(chǎn)品匯集了現(xiàn)代電子技術(shù)、通信技術(shù)、計(jì)算機(jī)及網(wǎng)絡(luò)技術(shù)，具有較高技術(shù)含量及高附加值，是典型的高科技行業(yè)。雖然我國(guó)繼電器行業(yè)經(jīng)過(guò)多年的發(fā)展，取得了令人矚目的成績(jī)，但是目前國(guó)內(nèi)有能力生產(chǎn)二次設(shè)備的企業(yè)仍然。

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的模塊備件，這些產(chǎn)品為分布式控制系統(tǒng)簡(jiǎn)稱(chēng)DCS 、可編程序控制器簡(jiǎn)稱(chēng)PLC、工業(yè)用模組 、
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人機(jī)界面SCSI(50、68、80Pin) AnyBus(Gateway)等一些自動(dòng)化設(shè)備備件。
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