RELIANCE 0-60002-6 RELIANCE 0-60002-6
RELIANCE 0-60002-6 RELIANCE 0-60002-6
檢測(cè)Q4的⑥腳若無(wú)電壓,說(shuō)明Q4的振蕩電路不工作或Q4管已損壞,而造成無(wú)直流電壓輸出。此時(shí)應(yīng)測(cè)量R5(取樣電阻)上的降壓,若無(wú)電壓說(shuō)明R5斷路,若電壓正常,應(yīng)更換Q4集成塊。
在排除此類故障時(shí),可不通電,用三用表電阻擋,檢測(cè)各元件是否斷路。
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2 保險(xiǎn)絲熔斷、無(wú)電壓輸出
通電開(kāi)機(jī)后保險(xiǎn)絲熔斷,說(shuō)明開(kāi)關(guān)電源電路內(nèi)有短路點(diǎn)。排除此類故障,首先斷開(kāi)電源,然后觀看各元件,器件有無(wú)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(wú)異常情況,用三用表電阻擋從輸入端開(kāi)始依次向后檢測(cè)各元件、器件的短路情況。應(yīng)先重點(diǎn)檢測(cè)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(yán)重漏電。檢查無(wú)問(wèn)題或排除故障后,方可更換新保險(xiǎn)絲進(jìn)行通電觀察開(kāi)關(guān)電源工作情況。
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