RELIANCE 0-60002-6 RELIANCE 0-60002-6
RELIANCE 0-60002-6 RELIANCE 0-60002-6
檢測Q4的⑥腳若無電壓，說明Q4的振蕩電路不工作或Q4管已損壞，而造成無直流電壓輸出。此時應測量R5(取樣電阻)上的降壓，若無電壓說明R5斷路，若電壓正常，應更換Q4集成塊。
在排除此類故障時，可不通電，用三用表電阻擋，檢測各元件是否斷路。
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2 保險絲熔斷、無電壓輸出
通電開機后保險絲熔斷，說明開關電源電路內(nèi)有短路點。排除此類故障，首先斷開電源，然后觀看各元件，器件有無異常情況，如碳化發(fā)黑、斷裂、電容器鼓包或電解液外溢等。發(fā)現(xiàn)有上述異常情況先更換之。若無異常情況，用三用表電阻擋從輸入端開始依次向后檢測各元件、器件的短路情況。應先重點檢測R1、D1—D4、C6—C8、Q1、Q4、B①—②繞組線圈及輸出電路的各濾波電容是否被擊穿短路或某元件絕緣不好嚴重漏電。檢查無問題或排除故障后，方可更換新保險絲進行通電觀察開關電源工作情況。
In iAPX 86/88, 186/188 User's Manual 3212E-2
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