Power Supply (PSU) Questions

[bigbeark]

I've got a couple of Old FSP-300s that failed the Power-Good Test on my inexpensive tester, so I tore one apart and removed the caps. There were six and all were bulging. They were all Fuhiyyu. One of them is 3300 10v but the can size is 10mmx35mm.
Where do you get those? The big axial resistor has the skin peeled off it. Should I re-coat it with something? Can't see what the banding is but I believe the body was pink.
Any ideas?

Also have a Zippy Emacs H2-6460P EPS that was "racing" on startup. I have several others of these that work, so I know this one's got a problem.

Shortly after you boot up, the fan races, then slows down, then races faster, then shuts down and finally the whole thing just shuts down.

Tried this with several boards, so I know its the PSU at fault.

Removed the cover - there are no bulging caps at all. Incredibly heavy-duty contruction inside. Any idea what could be causing these symptoms?

[etnietering]

Re: Power Supply (PSU) Questions

The consensus around here is that the big Fuhjyyus aren't honestly rated. Somebody (I don't remember who) measured one once that was supposed to be 4700uF and if I remember correctly it was actually around 3000uF. So chances are yours isn't even close to 3300uF. You may, however, be able to stuff a 12.5mm diameter cap in it's place. They usually have the same lead spacing (5.0mm), so it's just a matter of clearance around the edges. Something like this would work: http://search.digikey.com/scripts/Dk...name=P12735-ND and since you know you'll have clearance height wise you can probably up the capacitance a notch or two.

For the resistor - can you open another of the same type of PSU (you said you had multiple) and see what the value is? Or if somebody else here has one they might be able to check for you.

The Zippy...my guess would be the temperature sensor or thermal protection circuit is malfunctioning. If this is screwed up it would cause the fan to go crazy (assuming it's a temperature controlled unit), and then put itself into thermal shutdown, even though it's not too hot. That's just a guess though, it could be something totally unrelated. Somebody else might have more insight...

[370forlife]

Re: Power Supply (PSU) Questions

Topcat sells the 10v + 16v samxon RS series that are 10mm x 30mm 3300uf.