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Charger SMPS input faulty

 
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Lisander



Joined: 27 Apr 2006
Posts: 7
Location: Iceland

PostPosted: Thu Apr 27, 2006 2:30 am    Post subject: Charger SMPS input faulty Reply with quote

I got a SWIT battery charger model S-3802S <here> and it doesn't seem to be able to oscillate at all so there isn't any output voltage. I've changed the current control IC (IC1) with no luck. All capacators seem to be ok. This SM looks to be controlled with a opto-coupler from the DC part and I haven't found anything there either.

Any (and many) SMPS hints appreciated. Thanks.
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PostPosted: Thu Apr 27, 2006 4:43 pm    Post subject: Reply with quote

The optocoupler is for voltage regulation. Have you tested the startup resistors?
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Lisander



Joined: 27 Apr 2006
Posts: 7
Location: Iceland

PostPosted: Thu Apr 27, 2006 7:20 pm    Post subject: Reply with quote

Found it Smile It was one of the two power resistors in the AC circuit (a 3W 75Kohm, out of standard)

Problem solved. Cool
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