Macron Power MPT-350P

[goodpsusearch]

This is a good power supply.

It has a full input filter, 6A bridge rectifier, Passive PFC, 2x1000uF 200V input caps, 2x2SC3320 switching transistors, big main transformer, 1xSBL3040PT at 3.3V, 2xSBL3040PT at 5V and 1xF16C20 at 12V. The fan is "Superred" and is temp. controlled.

There are 2 caps bulging: one at 5vsb (2x2200uF 10V GL) & one at 5V (2x2200uF 10V GL).
3.3V: 2x2200uF 10V GL
12V: 1x3300uF 16V GL

It powered an ATHLON XP Barton 2800+ and Geforce FX 5600. The voltages were in spec but the psu made a high pitch noise (due to the bad caps?).

[c_hegge]

Re: Macron Power MPT-350P

It looks a bit like an FSP knock-off with those heatsinks.

[kc8adu]

Re: Macron Power MPT-350P

i am not the only one to spot that i see.

It looks a bit like an FSP knock-off with those heatsinks.

[momaka]

Re: Macron Power MPT-350P

Looks almost exactly like the MPT-301 (300W model), but with much better heatsinks, bigger primary caps, PPFC, and an extra schottky for the 5v rail.

It is a decent PSU, minus the caps.

[goodpsusearch]

Re: Macron Power MPT-350P

Looks almost exactly like the MPT-301 (300W model), but with much better heatsinks, bigger primary caps, PPFC, and an extra schottky for the 5v rail.

It is a decent PSU, minus the caps.

Another difference is that the transistors of MPT-350P are 2x2SC3320 instead of 2xFJPF13009 that my MPT-301 has.

But my MPT-301 has 2x SBL3040PT schottkys for the 5V rail as well.

edit: The heatsinks are not bad for that wattage.

[goodpsusearch]

Re: Macron Power MPT-350P

I recapped the psu, using exclusively Made In Japan caps.

2x1000uF 200V Fuhjyyu input caps -> not changed

2x1uF 50V Fuhjyyu TN & 1x1uF 50V G-Luxon SS -> 3x1uF Nichicon PW 50V

1x1uF 50V Jpce-tur -> not changed

4x10uF 50V GL -> 4x10uF 50V UCC KY

1x470uF 25V Fuhjyyu TN -> 1x 470uF 35V Nichicon HE

+12V
1x3300uF 16V GL -> 1x3300uF 16V Panasonic FR

+5Vsb
2x2200uF 10V GL -> 2x2200uF 16V Panasonic HFQ taken from an old Intel PII motherboard

+5V
2x2200uF 10V GL -> 1x2700uF 10V Panasonic FK & 1x3300uF 6.3V Panasonic FK

+3.3V
2x2200uF 10V GL -> 2x2700uF 10V Panasonic FK

-12V and -5V:
2x220uF 16V GL -> 1x220uF 16V Rubycon YXF & 1x220uF 50V Nichicon HE

It runs perfectly fine

[momaka]

Re: Macron Power MPT-350P

I like it . Should definitely be capable of 350W and with the new caps I doubt the noise/ripple will ever be a problem. Nice job!

My MPT-301 is also still doing fine (recapped with Japanese as well). I've been mainly using it as a test PSU and lately to power my 939Dual-Sata2 with a AMD Athlon 64 3200+ (67W TDP) CPU. I even tried a FX-57 CPU (104W TDP) and the voltage rails were rock stable and still almost not cross-loaded at all. Might post some pictures of it in the PSU Pictorial thread, even though there are already quite of them in that thread.

The only thing that worries me is the 2-transistor self-oscillating 5VSB on these. But other than that, they seem like great simple PSUs (sort of like the older FSPs and Antecs).

[goodpsusearch]

Re: Macron Power MPT-350P

I don't worry about that. Replacing the 5vsb output filter caps and the small ones, especially the 5vsb critical cap (usually 47uF 50V) with Japanese quality capacitors does the job.

I almost forgot to mention that I always turn the psu off by the on/off button.

Yes, post some photos of it

[momaka]

Re: Macron Power MPT-350P

I don't worry about that. Replacing the 5vsb output filter caps and the small ones, especially the 5vsb critical cap (usually 47uF 50V) with Japanese quality capacitors does the job.

There doesn't seem to be one in this unit, though. I tried tracing the 5VSB circuit on mine before, but I only encountered film and ceramic caps.

I almost forgot to mention that I always turn the psu off by the on/off button.

I do that too on all of my PSUs with the 2-transistor 5VSB circuit, but for other designs (like the PWM-FETs) I just leave it on.

Yes, post some photos of it

Will do.

[SuperDuty]

Re: Macron Power MPT-350P

Sorry to hijack your thread but I'm doing the same thing on one of my MPT-300, it's branded as "Advance" which is a french brand of bad quality computer products. It's very similar as the MPT-350P, same transformer, nearly identical layout, but some components are different : no PFC (holes are there), no bridge rectifier (only four diodes), weaker mosfets, smaller radiators.

So far I've changed :
- the filter coils with beefier EE25 ones (the one at the power connector, and the other one on the board)
- the bigger capacitors, but I did with what I had so it's half good half bad, but it's still much better than the Fuhjjyu and PCe-Tur toasted caps.
- I've replaced the four diodes with a RS405L bridge rectifier
- I've swapped the two primary caps with 560uF ones, originals were 470uF.

So I did some tests : with the original unmodified one, I'm getting an unsteady 11.53V~11.61V with a multimeter, not good at all. With the modified one though, I've increased the voltage up to a good 11.71V~11.83V. Still not very constant but it's an improvement.

I'm planning on adding a passive PFC, I have a few of those. I want to replace the 10A superfast on the +12V rail, it's a STPR1020CT. What can I replace that with ?

The transformer in there 'MP9912T1 looks indentical to the one in my Fortron FSP300-60THA, except it's not wrapped in plastic tape.

[Wester547]

Re: Macron Power MPT-350P

^ Not fully on topic but EE cores are more effective at filtering than coils? That is, EMI (or input and transient) filtering since that's usually the application of EE cores that I've seen. As for the ultrafast recovery rectifier, you could add another one in parallel to give you 20A output on the +12V rail or you could just replace it with a 20A schottky, like MBR20100CT or something.

[SuperDuty]

Re: Macron Power MPT-350P

Honestly I don't know about EE25...I just guessed since most of my good PSUs have EE25 at the filtering. There were holes pre drilled for them and I had a few of those lying around, so I thought, why not ?

As for the schottky, I did have a SBR20100CT but I just found out it's shorted. So I found a ER1602 which is rated at 16A.

[SuperDuty]

Re: Macron Power MPT-350P

So today I made a few more modifications :
- added a passive PFC (I had to cut a part of the radiator just like this picture : https://www.badcaps.net/forum/attach...7&d=1291339960 )
- replaced the two C4242 with a pair of 13009
- replaced the 10A schottky with a 16A one at the 12V rail

I've done some simple tests with the following setup :
Athlon 64 LE-1600
2Gb of DDR2
nVidia mGPU 8200
Radeon HD4850 Sapphire Toxic

The 3.3V is steady, the 5V is at 5.12V, and the 12V is at a steady 11.75-11.76 under load for an hour on Video Memory Stress test with a multimeter.
Now if I remove the HD4850 and use the mGPU, I have a pretty perfect 11.99-12V under load. The same test with a Bestec ATX-300-12Z gives 11.83V.
That's close to a 0.5V improvement over the original one, and a much better stability.

So being very basic tests, I'm not sure how reliable they are but it does show these units are pretty capable.

[Pentium4]

Re: Macron Power MPT-350P

An Athlon 64 and a 4850 seems like a lot of load for that 16A rectifier, maybe you should put at least a 20A part there? I know those GPU's use a lot of power, but it might be okay if the cooling is good

[SuperDuty]

Re: Macron Power MPT-350P

The HD4850 has a TDP of 110W, the Athlon 64 LE-1600 has a TDP of only 45W.

Should I lower the 5V rail (30A SBL3040PT) to increase the 12V rail ?

[Wester547]

Re: Macron Power MPT-350P

Well, the problem with ER1602 is that it is a superfast recovery rectifier if I'm not mistaken which isn't much better than an ultrafast (if not worse) in voltage drops despite the higher current rating. That's why I suggest going with a regular schotty (it is very common to find those with a 20A rating, in TO-220 form that is) but if the 16A part works fine then maybe you don't need to change it. Still, 110W + 45W = 155W, which is somewhat close to 192W (16A @ 12V) and that's not taking into account other components that draw power from the +12V rail (though they probably require a minimal amount of power in comparison).

[SuperDuty]

Re: Macron Power MPT-350P

Well it's a rather power hungry setup I know, but I made it as a 12V stress test for this power supply since I'm trying to improve its 12V rail and stability. It's from 2002 so it's mainly a 5V power supply.

I used a 300W Fortron PSU in my main rig (Phenom II X4 965/big Asus mobo/12Gb/HD5770/three HDDs) for six month without a single problem, and the internals are similar in specs.