歐陸590 直流調(diào)速器維修案例一
故障現(xiàn)象：歐陸 590 直流調(diào)速器不能調(diào)速。
檢查分析：經(jīng)檢查 +10V 電壓基準(zhǔn)電源為 2V 左右， -10V 電壓基準(zhǔn)電源為 -7V 左右，查看有一 IC 發(fā)熱很大，更換后 -10V 電源正常，但 +10V 電源為 +13V ，再測量此 IC 附近有 2 個貼片電阻燒斷，更換后± 10 電源正常，接上馬達(dá)試機調(diào)速運行正常。
歐陸590 直流調(diào)速器維修案例二
故障現(xiàn)象： LCD 黑屏（但底板電源正常面板的正常指示燈及運行指示燈閃）
故障分析： 造成 LCD 黑屏的原因有兩種：一是電源供給5V不正常；二是程序初始化未能正常執(zhí)行。最初用示波器觀測單片機 80C196KC晶振輸入波形基本正常但有間歇性振蕩幅度突降現(xiàn)象（間歇性周期約為 5MS ）單片機 I/O 輸出數(shù)據(jù)也為間歇性中斷輸出（無數(shù)據(jù)狀態(tài)且頻率一致）因此故障電路指向 5V 電源及單片機的復(fù)位端信號正常與否？
結(jié)果表示: 復(fù)位端正常啟動應(yīng)為 H 電平而現(xiàn)為一脈沖，顯然是這一脈沖導(dǎo)致I/O輸出數(shù)據(jù)間歇性中斷。 +5V 電源也有間歇性突降至 4V 現(xiàn)象，造成 +5V 電源突降4V 的可能，明顯是電路中有元件受損跟隨于這一間歇頻率瞬時短路現(xiàn)象，從而造成單片和復(fù)位不成功，為此特意取消單片機電源監(jiān)控復(fù)位保護信號 MAX825 芯片啟動電源，短路故障（ ULN2003 發(fā)燙）出現(xiàn)，換上新的 ULN2003 啟通電正常。
歐陸直流調(diào)速器維修包括以下系列產(chǎn)品：
591P/0015/220/,590P/0015/220/,591P/0035/220/,590P/0035/220/,591P/0015/500/,590P/0015/500/,
591P/0035/500/,590P/0035/500/,591P/0040/220/,590P/0040/220/,591P/0070/220/,590P/0070/220/,
591P/0110/220/,590P/0110/220/,591P/0165/220/,590P/0165/220/,591P/0040/500/,590P/0040/500/,
591P/0070/500/,590P/0070/500/,591P/0110/500/,590P/0110/500/,591P/0165/500/,590P/0165/500/,
591P/0180/220/,590P/0180/220/,591P/0270/220/,590P/0270/220/,591P/0180/500/,590P/0180/500/,
591P/0270/500/,590P/0270/500/,591P/0380/220/,590P/0380/220/,591P/0500/220/,590P/0500/220/,
591P/0725/220/,590P/0725/220/,591P/0830/220/,590P/0830/220/,591P/0380/500/,590P/0380/500/,
591P/0500/500/,590P/0500/500/,591P/0725/500/,590P/0725/500/,591P/0830/500/,590P/0830/500/,
591P/0380/600/,590P/0380/600/,591P/0500/600/,590P/0500/600/,591P/0725/600/,590P/0725/600/,
591P/0830/600/,590P/0830/600/,591P/0380/220/,590P/0380/220/,591P/0500/220/,590P/0500/220/,
591P/0725/220/,590P/0725/220/,591P/0830/220/,590P/0830/220/,591P/0380/500/,590P/0380/500/,
591P/0500/500/,590P/0500/500/,591P/0725/500/,590P/0725/500/,591P/0830/500/,590P/0830/500/,
591P/0380/600/,590P/0380/600/,591P/0500/600/,590P/0500/600/,591P/0725/600/,590P/0725/600/,
591P/0830/600/,590P/0830/600/,591P/1580/220/,590P/1580/220/,591P/1580/500/,590P/1580/500/,
591P/1580/600/,590P/1580/600/,591P/1580/220/,590P/1580/220/,591P/1580/500/,590P/1580/500/,
591P/1580/600/,590P/1580/600/,591P/1200/500/,590P/1200/500/,591P/1700/500/,590P/1700/500/,
591P/2200/500/,590P/2200/500/,591P/2700/500/,590P/2700/500/,591P/1200/690/,590P/1200/690/,
591P/1700/690/,590P/1700/690/,591P/2200/690/,590P/2200/690/,591P/2700/690/,590P/2700/690/,
591P/1200/500/,590P/1200/500/,591P/1700/500/,590P/1700/500/,591P/2200/500/,590P/2200/500/,
591P/2700/500/,590P/2700/500/,591P/1200/690/,590P/1200/690/,591P/1700/690/,590P/1700/690/,
591P/2200/690/,590P/2200/690/,591P/2700/690/,590P/2700/690/
512C/514/512C/04,512C/08,512C/16,512C/32; |
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