ka3846討論
我正在修一臺電焊機,zx7-160st,控制板原理圖在下面。主要的問題是,ka3846的4腳,電壓是0.9v,ka3846不啟動。在該控制板上圖中的D1未接。如果將R16變成1.5k的電路就工作了。通過計算來看,Vcc通過R19 1K、R18 510、R16 15k到Vss、通過R17 150到地,有問題。還有就是,將R16變成1.5k啟動ka3846后,將電位器接于P2的2、3、4腳上,調(diào)節(jié)電位器,用示波器觀察輸出G1、E1 G2、E2 G3、E3 G4、E4這些點的波形后發(fā)現(xiàn)G1、E1 G2、E2 兩組波形可以調(diào)節(jié),而G3、E3 G4、E4兩組波形調(diào)節(jié)很小,基本不能調(diào)節(jié),不知是哪里的問題,請教各位大俠們。
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@安達羅
無圖沒辦法與你分析!
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