Powertek Intl PTI-400AR-T

[c_hegge]

When I first saw this, I thought, "Oh, it'll just be another gutless wonder". Let's see.

An overall look at the PSU suggests that it's not all that gutless. The major parts are all there and the transformars are bigger than what I see in deer and sun pro PSUs, although the heatsinks sure could be thicker. The fan had failed when I got this PSU, so that will need replacing.

The primary side could be better, but could be worse as well. the X and Y caps are there as is the filter. The caps ("TL" Brand) are a little small at 330uF. The major problem is 4 DIODES

On the secondary side we have mostly "KSC" Branded caps and a single teapo. There are 4x 2200uF 10v, 1x 2200uF 16V, 1x 1000uF 16V and 2x 1000uF 10V (5vsb).

What do you guys think. Is it half decent? or did I miss something?

[Scenic]

Re: Powertek Intl PTI-400AR-T

the mini-preview of the label reminded me a bit of HEC/Herolchi for some reason..

i'd say its a keeper (after a recap and a proper rectifier)
looks halfway decent.. even if 400W is "a bit" optimistic..

[c_hegge]

Re: Powertek Intl PTI-400AR-T

It is really 400 watts with no modifications. For half a second!!!

[goodpsusearch]

Re: Powertek Intl PTI-400AR-T

I would replace input caps with ones of greater value (680uF or greater), 4 diodes with a bridge rectifier at least 6A and try to recap secondary caps with quality caps of greater capacity, 2200->2700/3300?, 1000->1500/2200? for every voltage output except 5vsb.

[370forlife]

Re: Powertek Intl PTI-400AR-T

I would also replace all the secondary schottky's with higher capacity parts, so if anything blows up it will be the primary so you don't loose all connected hardware.

[c_hegge]

Re: Powertek Intl PTI-400AR-T

Hmmm, For now, I might just beef up the secondary caps, replace the diodes with a rectifier, put some bigger heatsinks in there and replace the fan. I might leave the primary caps and secondary mosfets for a bit later. I don't want to spend much money on this, so I'll use mostly parts salvaged from other gear.

[c_hegge]

Re: Powertek Intl PTI-400AR-T

Replaced the diodes & Heatsinks. Its my first mod to the 240V half of a PSU and will be my last. I plugged it in and it blew up and gave me a big fright. I will just throw it out it now. I won't bother looking into it further.

EDIT: It blew the fuse too

[goodpsusearch]

Re: Powertek Intl PTI-400AR-T

It worked before modding?

[c_hegge]

Re: Powertek Intl PTI-400AR-T

It worked before modding?

Sure did. The only problem was that the fan sounded like a lawn mower.

[momaka]

Re: Powertek Intl PTI-400AR-T

Did you put the thermal/insulating pads back on the transistors when you changed the primary heatsink? Did you put the bridge rectifier the right way (assuming this is what you used to replace the 4 diodes)?
It's probably just a simple mistake that can be easily fixed. PSU looks decent enough to look into.
Don't get discouraged by this, just be more careful. Before plugging things in, always check with your multimeter for any shorts. Also, wear safety glasses when testing, especially if the PSU has the cover off.

[c_hegge]

Re: Powertek Intl PTI-400AR-T

Yes, I did put the pads over the transistors and the rectifier was in the right way. I have already trashed this PSU, so it's a bit late now, but I'm not too worried. I already have several spare PSUs which I was able to fix/improve.