Antec SP-350 Recap and Fan Mod

[dmill89]

I know this isn't the first Antec SP series PSU recap posted on this site but there doesn't appear to have been one for a while. I did a full recap (except fan controller) and fan Mod of this SP-350.

Primary:


Overhead:


Secondary:


Fan Mod Close Up:



Caps Replaced:
2X 680uf 200V Fuhjyyu LP > 2X 680uf 200v Panasonic ED
3300uf 16v Teapo SC > 3300uf 16v UCC KZE
2200uf 10v Fuhjyyu TM > 2200uf 10v UCC KZE
2X 3300uf 6.3v Fuhjyyu TM > 2X 3300uf 16v Samxon RS
2X 1000uf 10v Koshin KRM > 2X 1000uf 10v UCC KZE
1000uf 10v Fuhjyyu TM > 1000uf 10v UCC KZE
330uf 16v Fuhjyyu TN > 680uf 16v UCC KZE
220uf 16v Fuhjyyu TN > 330uf 25v Rubycon ZLJ
47uf 50v Teapo SEK > 56uf 50v UCC KZE
22uf 50v Koshin KRM > 56uf 50v UCC KZE
10uf 50v Fuhjyyu TN > 22uf 50v UCC KZE
Various 1uf to 2.2uf 50v Koshin & Fuhjyyu > 2.2uf 50v UCC KY
.1uf 50v Fuhjyyu TN > 1uf 50v Nichicon PW


Other Modifications:
Added heatsink to bridge rectifier
Added 2200ohm resistor in parallel to thermal resistor. this keeps both fans spinning at ~1000-1500 rpm when cold, and they speed up as normal once the thermal resistor heats up and its resistance drops. This alleviates the hot running issues with this PSU.

[PeteS in CA]

Re: Antec SP-350 Recap and Fan Mod

Besides the thermal benefits of having some cooling at all times, that minimum fan speed may actually be better for the fan bearings, by keeping the lubrication spread on the bearings. A temp-controlled fan voltage regulator I worked with had a minimum output voltage chosen to have the fan running at all times. We had to adjust that minimum voltage from 6V to 12V. The sample Rotron 24V fan we had ran reliably at 5V (and we set the minimum at 6V), but Rotron only guaranteed 10V or 11V.

[dmill89]

Re: Antec SP-350 Recap and Fan Mod

^
Good point especially since Antec/CWT used sleeve bearing fans in this PSU where good lubrication is very important. This PSU is in my test/experimental system which is not heavily used so I left the stock fans in, if it was in a more heavily used system I would probably replace them with ball bearing fans.

[c_hegge]

Re: Antec SP-350 Recap and Fan Mod

I sometimes replace the front fan, depending on which brand it originally was. If it's a Dynatron Top Motor, I leave it, but if it's an Xfan, I replace it.

[dekcarc]

Re: Antec SP-350 Recap and Fan Mod

Looks like the photos in the original post aren't there anymore. :-(

I'd like to see if the fan mod was anything fancy...

[c_hegge]

Re: Antec SP-350 Recap and Fan Mod

They are still there. The fan mod is simply a 2.2K resistor in parallel with the thermistor. I do this with every smartpower I get my hands on.

EDIT: In case you still can't see it, I'll attach it here