Hi,
I have one PSU which the Live 1A Fuse blows repeatedly. I read that changing the rectifier should solve thisproblem. However after changing the rectifier, the fuse continues to be blown. Any advise?
Thanks. SeventhPrince???
Find the short.
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Check the capacitor and regulating semiconductors. Bob AZ
CJT wrote in news: snipped-for-privacy@prodigy.net:
Probably a shorted switcher transistor or secondary diode. He should find a book on how switching power supplies work,or read the application notes for the UC3842 IC.
-- Jim Yanik jyanik
Did you test the rectifier or just blindly replace it? If you're not able to test semiconductors you'll dump a lot of money into this thing trying to get it going and may well still fail.
I have one PSU which the Live 1A Fuse blows repeatedly. I read that changing the rectifier should solve thisproblem. However after changing the rectifier, the fuse continues to be blown. Any advise?
Thanks. SeventhPrince???
Surely, the very first question to ask, before any of us can help, is what type of supply is it - switch mode or linear ? Then the next one has got to be, is the right fuse type being used ? If the supply has a damned great transformer in it, and some big smoothers to stick an additional heavy load on besides the core magnetization current at switch on, then if a ' T ' rated fuse is not being used as the replacement, it may well keep blowing at switch on.
Arfa
How do I differentiate between these 2?
Yes, correct rating fuse is used. What are 'T' fuse and 'big smoothers' ?
Thanks.
Seventh Prince
How do I test the rectifies? Thanks
In all honesty, if you don't know how to tell apart switchers and linears, don't know how to test a rectifier, don't know what a smoothing cap is, and are able to determine that the fuse you are fitting is " correctly rated ", without knowing what a ' T ' spec on a fuse is, then I don't think that you are ever going to get to the bottom of the problem with or without the group's help.
Power supplies, particularly switchers, are dangerous, and someone with your apparent lack of knowledge should not be attempting to work on them, for his own safety ....
Arfa
able to
get
It sounds like you've got a lot of homework to do before you try repairing something, I assume you haven't read the sci.electronics.repair faq?
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