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指示燈

福日HFC－25P70開機三無,電源指示燈瞬間閃亮一下熄滅。

發布日期：2022-04-17 點擊率：80 品牌：宏發_Hongfa

       分析可能是由于某種原因引起保護電路動作，迫使開關電源停止工作。首先焊脫Ｒ７８３，斷開行輸出直流供電；焊脫ＶＤ７４３，斷開＋１２５Ｖ輸出端過壓保護控制。并在Ｃ９５４兩端外接一電壓表進行電壓監測，然后開機觀察電壓表指示值，發現有約１５５Ｖ的瞬間跳變電壓，由此判斷開關電源穩壓控制電路有故障。若Ｒ９５５、Ｒ９５６、Ｒ９６９開路或Ｑ９５１、ＶＤ９７１漏電，ＩＣ９０２開路或內部異常，均將引起開關電源輸出電壓過高。斷電后，在路測試上述元器件，發現Ｒ９６９開路損壞，更換Ｒ９６９試機，故障排除。

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