FSP300-60PN, failed to start

[370forlife]

Re: FSP300-60PN, failed to start

Didn't some of the old antec-cwt units use that "flying resistor" method?

Good job on the recap, and getting rid of the needless resistors.

[yanz]

Re: FSP300-60PN, failed to start

burn-in test :



pls ignore how messy the bckground is.. :-D


and then, with the real load (p3 933MHZ system doing folding@home) :



all the rails were good, me think.

[yanz]

Re: FSP300-60PN, failed to start

Summary(?)
-----------

The flaws (in my opinion) of this fsp300-60pn PSU :

1. 120mm fan (yate loon fan) is still good, but making a rattling sound. it give too low air pressure for the components inside secondary area. (how about using a bit more reliable fan like, err.. panaflo or nidec?)
   
   
2. the deadzone design doesnt help much with cooling in this PSU.
   
   
   
   
3. dummy resistors are touching the caps, the coil, and all the small components nearside. and why those engineers have too put a stupid 2,6W big resistor on teh 5V rails? maybe for an immediate load? (or maybe they're just paranoid..?)

------

My solution :

1. I againts an idea of using a 120mm fan on this PSU, so i use a 90mm panaflo fan (moderate cfm). it will give enough air pressure to secondary area, and it will not block the whole input hole, making the circulation better, and minimize the dead zone effect.
   
   
   
   
   
   
   Or, i could make a hole on the PSu casing near the secondary side, and use my sunon 120mm fans. But i didn't do this.
   
   
   
2. Remove all the dummy resistor. They are dummy and killing the components. No ill effect to PSU operation after used in pc system, but dont take all my words though, it's just what i observe and my experience. i could be wrong.
   

[yanz]

Re: FSP300-60PN, failed to start

The PSU is happily powering a E5200 C2D system with Nvidia 9300 now. Will monitoring the KZJ cap periodically (each 6 month). I have the feeling that KZJ have different characteristic then KZG.


Oh, if you have any comments, pleast post ones. And, thanks for ur times here..

[370forlife]

Re: FSP300-60PN, failed to start

Look for a fan in the neighborhood of a nidec ta350dc. They are 92mm x 25mm, and can push up to 60-70cfm not very loudly.

http://cgi.ebay.com/DELL-Case-Fan-P-N-P2780-Nidec-Beta-V-TA350DC-M35291-35_W0QQitemZ230342457512QQcmdZViewItemQQptZCOMP_EN_Networking_Components?hash=item35a17af8a8&_trksid=p3286.c0.m14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205|293%3A1|294%3A50

he he, a 150cfm one.

[yanz]

Re: FSP300-60PN, failed to start

err.. one more conclusion : there are risks in buying second hand psu(s). this is just one example. if u know how to fix it and love the fum of solder, go try it. and a working one doesn't always mean a healthy one. always open it to check the innard (and maybe it will give u a 'nice' surprise).

just my 2 cent

[yanz]

Re: FSP300-60PN, failed to start

Look for a fan in the neighborhood of a nidec ta350dc. They are 92mm x 25mm, and can push up to 60-70cfm not very loudly.

http://cgi.ebay.com/DELL-Case-Fan-P-N-P2780-Nidec-Beta-V-TA350DC-M35291-35_W0QQitemZ230342457512QQcmdZViewItemQQptZCOMP_EN_Networking_Components?hash=item35a17af8a8&_trksid=p3286.c0.m14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205|293%3A1|294%3A50

he he, a 150cfm one.

woops, we posted almos at the same time thx!

yeah.. i think i have one nidec 120mm fan although not exactly like your recommendation. a louder one would sitll be okay because this psu use a "noise killer" that operating that fan at stupidly low voltage..

[370forlife]

Re: FSP300-60PN, failed to start

thats a 2.3A fan though, may burn it up.

[370forlife]

Re: FSP300-60PN, failed to start

http://www.newegg.com/Product/Produc...82E16835213002

That might be powerful enough

[yanz]

Re: FSP300-60PN, failed to start

if u give me one, coz it's a $36 fan.. hehe

[yanz]

Re: FSP300-60PN, failed to start

eh? i know those fan. it seems they are $2-3 cheaper here, dunno why.

yep. i have used that ta350dc once for other project.

[370forlife]

Re: FSP300-60PN, failed to start

Nidecs are the only fans I use now.

[yanz]

Re: FSP300-60PN, failed to start

Didn't some of the old antec-cwt units use that "flying resistor" method?

Good job on the recap, and getting rid of the needless resistors.

Antec have a smarter designer then. Or unlikely? coz they choose fuhjyuu craps.

>> getting rid of the needless resistors.

and the voltage switch-selector too. thx

[370forlife]

Re: FSP300-60PN, failed to start

and the voltage switch-selector too. thx

Ahh, the old leadman "APFC"

[Wizard]

Re: FSP300-60PN, failed to start

These resistors serves to equalize loads presented to PSU point of view because the computer's loads is very dynamic (high impredance in one moment then low impredance in next instant). With this resistors, this helps to stablize the regulation and less jumpy/spiky and keep PSU in sweet zone more consistently.
Plus these resistors are sized as such that resistance is higher than the loads, when load becomes higher, resistor's role in total load becomes small.

In old days, IBM had load resistors plugged to unused drive connectors on late PC/XT and AT boxens and other high end stuff.

Cheers, Wizard

[ratdude747]

Re: FSP300-60PN, failed to start

why dont you just oil the old fan. take off the sticker, remove the rubber plug, squirt some lube in there, put plug in, and put tape or whatever over the plug to hold it in.

[370forlife]

Re: FSP300-60PN, failed to start

If its a ball bearing fan, its not that simple.

The races for the balls (...ahem) may be worn out and causing the balls (...ahem) to move back and forth and rattle around. Or the testi...I mean balls may be worn out themselves.

[momaka]

Re: FSP300-60PN, failed to start

Nice recap job! And it's a good thing you removed those hot resistors from there.

If its a ball bearing fan, its not that simple.

Actually, it's not too complicated either. Basically you do what ratdude said, but with one extra step - you remove the locking washer from the fan axle/shaft and take apart the whole fan (you should do that anyways since it's not that much more work). Then you dump plenty of oil on the ball bearing(s) and some on the axle. This should keep the fan quiet for at least a year.

[370forlife]

Re: FSP300-60PN, failed to start

Usually all the oil does is just make it a lot harder for the balls to move around and make noise. It would eventually come back once the oil makes it way through.

[momaka]

Re: FSP300-60PN, failed to start

That's true, but like I said the fan will probably work fine for a year or two, depending on the oil you use (though I guess this wouldn't be a suitable repair for a customer's computer). After that it will need oil again.
The key to a longer lasting fan, though, is to catch it before the bearings go dry. Otherwise they start to wear out very quickly after that point.