Re: Aspire/Apevia 520W
Any suggestions on what to do with this PSU? Worth recapping and selling? Or better as a paperweight?
Trinite
Senior Member
Last Activity: 05-23-2011, 02:07 PM
Joined: 12-08-2010
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Re: Aspire/Apevia 520W
Yeah, I've been examining the circuitry. The 5VSB looks really sketchy. It seems the C5353 feeds back into a C2235, which in turn feeds back into the C5353 - viola! Self-oscillation! And the whole thing is regulated, like you said, by a 431 via optocoupler.
As for caps, looks like the 3.3V rail uses two 10V 3300uF, the 5V uses one 16V 3300uF and one 10V 470uf, the 12V uses one 16V 3300uf and one 16V 470uf, the -5V uses one 10V 470uF, the -12V uses one 16V 470uF and lastly, the 5VSB uses one 10V 1000uF and one 10V 2200uF.
I thought...Leave a comment:
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Re: Aspire/Apevia 520W
Self-oscillating, you say? Sounds delightfully unstable. I don't see any zeners present, so I'll have to install one.
It does use a KA7500C, which provides a 5V reference supply, but I don't know if that is for the chip itself, or whether it actually regulates the 5VSB. The voltage monitoring chip is an AAT1014, but I don't think it's relevant to the 5VSB, unless it uses it for VCC....Leave a comment:
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Re: Aspire/Apevia 520W
This unit is so overcrowded with components and wires (terrible layout), it's hard to tell what's in here without desoldering stuff. I did find two transistors after the 5VSB transformer, one of which is a 2SC2235. The other one is identical, but the numbering is obscured, but I assume it is the same (or complimented with a 2SA965). Not sure if this is the aforementioned 5VSB of doom or not
Also, I actually do have a PSU lying around somewhere that came with a computer case that uses a couple TO-92 type transistors to...Last edited by Trinite; 05-14-2011, 01:58 PM.Leave a comment:
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Re: Aspire/Apevia 520W
The 5VSB seems to use a single NPN transistor attached to its own heatsink. Appears a bit more robust than using the 2 transistor setup (I assume you're talking about the 2 undersized transistors you see on the 5VSB in most cheapo PSUs). The fans are Aspire (Apevia) brand, seem to run fine. The wiring is 18AWG.
Oops, looks like I did get the transformer taps backwards
And Th3_uN1Qu3, I guess it would true about the output. Even if the diodes are kept sufficiently cool, there would likely be too...Leave a comment:
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Aspire/Apevia 520W
Yes, one of these...
I pulled this one out of a computer and opened it up to find it filled with bloaters. Still working when I removed it, oddly enough.
To my surprise, it seems to be a much better build than most Young Year (OEM Sun Pro) makes.
([url=http://www.hardwaresecrets.com/article/413]Hardware Secrets article here[/url])
It has a complete transient filter (2 X/2 Y capacitors, 3 filter coils, 1 NTC thermistor and an MOV). The rectifying bridge is a PBU805, rated 8 amps at 100°C. At 120V, this gives a limit of 960W, well within spec.... -
Re: PC Power & Cooling 510 - Kill the Teapos?
After an inspection, they all seem in good shape. So I think I'll keep them in there. It would a hassle to recap anyway, since the PSU is a very cramped design.Leave a comment:
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PC Power & Cooling 510 - Kill the Teapos?
I have a PC Power and Cooling Turbocool 510W model. It has Teapos inside, much to my distaste. However, I've never heard of PC P&C units blowing up, so it would seem that either PC P&C used a decent series of Teapos, or that the PSU is designed so that the capacitors are utilized well below their rating.
I plan on selling this unit, which is probably 5 or 6 years old. Should I replace the Teapos, just to be on the safe side, or should it be fine as is? -
Re: Blown Amp/Mixer
I checked. Both heatsinks are grounded, so them touching is not an issue. The 7815 and 7812 regs each are grounded through the center leg, so their contact with the heatsink again poses no issue. Otherwise, I would have straightened them out; but in this case, the work was unnecessary and a posed a risk of PCB damage, so I left them as is....Leave a comment:
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Re: netflix, the network destoryer
Never had issues with Comcast, but AT&T on the other hand just seems to be going downhill across the board.Leave a comment:
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Re: Blown Amp/Mixer
Also replaced all the non-name caps in the amp section, which got rid of a lot of the AC hum, along with grounding it. Actually sounds quite decent now. In any case, it's a much nicer unit than when I first started.
Just for laughs, I uploaded a pic of the warning label to show the quality of the "Engrish" used, which also implies the original build quality of the unit....Leave a comment:
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Re: Blown Amp/Mixer
Been busy lately, but finally got around to fixing this unit. Replaced 2 op-amps, 2 burned out resistors, added a bleed resistor on the high voltage section and added a ground-lift switch.
Ended up learning quite a bit about audio systems in the process as well....Leave a comment:
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Re: Aluminium capacitors in linear power supply
I'm working on an audio system right now that uses 78xx/79xx series regulators, and it makes generous use of aluminum capacitors.Leave a comment:
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Re: Vista or Vistrash?
Vista was ok for the times I used it, but definitely on the slow side. On the other hand, I installed Windows 7 on a customer's older XP machine and it ran quite nicely. A bit slower than XP, but still faster than Vista on a newer machine.Leave a comment:
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Re: Blown Amp/Mixer
Here is a diagram of the circuit that provides the +60V to the phantom power reg.
Note: Ground reference is provided by the transformer center tap and is not referenced to the -20VDC output....Leave a comment:
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Re: Blown Amp/Mixer
The input power is 40V (-20V/+20V). However, the phantom power uses two capacitors coupled with the AC inputs and is supplied with a +20VDC bias. So the reg is actually getting 60V.
Also, I do not know if the previous resistors were fusible, since they were burned beyond recognition, but I am replacing them with fusible ones....Last edited by Trinite; 02-13-2011, 02:34 PM.Leave a comment:
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Re: Internal Shots of the Logitech Z313
Can't be much worse than what you would find in a "high end" Bose unit, I would imagine...Leave a comment:
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Re: Blown Amp/Mixer
The unit consists of a total of 20 4558s. 8 on the inputs, 4 on the output, 7 on the EQ and one for the headphones. I could replace them all, but knowing this unit the circuitry is probably quite poorly designed. Seems like I should just get some 4558s then.Leave a comment:
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Re: Blown Amp/Mixer
Looks like this is quite the trainwreck. I couldn't get sound out of the speakers, so I took the front panel off the unit and found two toasted resistors. These supply a positive and negative voltage to an array of opamps, one of which had had failed shorted. The opamps are PJ4558CD - couldn't find them on Digikey so replacing them with NJM4558D. The resistor codes were unreadable; fortunately, the value (47ohm) was printed on the board.
Thankfully parts are cheap, otherwise this would be quite the moneypit...
The PCB does indicate...Leave a comment:
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Re: Internal Shots of the Logitech Z313
Looks like Logitech has gone downhill in quality. I have their X-530 5.1 set that I got a few years ago and it is actually rather decent. I am not a fan of their newer setups, though.Leave a comment:
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