Joined: Nov 27, 2004 Posts: 120 Location: sheboygan wisconsin
Posted: Mon Dec 13, 2004 7:42 am Post subject: how do u test the power supplies (dieing without my xbox)
how do u test the power supplies particularly the 1.6 thanks
custom-xmodz Xbox-HQ Freak
Joined: Aug 28, 2004 Posts: 796 Location: Wales, UK
Posted: Mon Dec 13, 2004 9:02 pm Post subject:
Hiya
If you dont have the motherboard I would plug it in and test all the plugs (HD and MOBO) for volatge with a multimeter. I would also test the fuse for continuity.
But if you don't know what you are doing as it's high voltage, and in the uk at least it is enough to kill you.
DJH
Scourge Xbox-HQ Freak
Joined: Nov 08, 2004 Posts: 571 Location: Georgia, USA
Posted: Tue Dec 14, 2004 5:55 am Post subject:
Ill post later with more details when I get next to my Xbox later, but I wanted to post this quickly so that you dont make a crucial mistake.
DO NOT turn on a PC (or xbox) powersupply without a load attactched to it. This can destroy a powersupply (if it isnt already broken). This is because this is a switching powersupply. It is meant to give the same voltage no matter the electrical charicteristics of the circuit. The only prerequisite is that there be a circuit there (a load).
I learned this from one of my teachers when I was using an old powersupply to build a digital circuit prototyping lab for home. I showed him my idea and he ran that concept by me. I trust his word because his MA was in power distribution systems.
Ill write later with detailed instructions. _________________ -Scourge "Rx = +/_\"
a.k.a. President Skroob
The electronic ninja.
Xbox v1.6
Xenium Ice XOS v2.3
Xtender: Stock HDD+300G+300G
BIOS: Evox M8_16+
Dash: UX
custom-xmodz Xbox-HQ Freak
Joined: Aug 28, 2004 Posts: 796 Location: Wales, UK
Posted: Thu Dec 16, 2004 7:07 am Post subject:
I know what your saying, ive never had any problem however, although I would normally just use a known working motherboard. However a few times I have switched it on with nothing plugged in, and never had any probs, in concept it's dodgy, but then so is picking up a chip without being grounded, and yet ive never damaged a chip either.
DJH
Scourge Xbox-HQ Freak
Joined: Nov 08, 2004 Posts: 571 Location: Georgia, USA
Posted: Thu Dec 16, 2004 8:55 pm Post subject:
Think of it as russian roulette. Ive handled many ICs in and out of school without a grounding strap and only had one damaged so far. It just happened to be a 512MB memory chip when I did. From now on when handling expencive ICs I use a strap, unless its something like a 74LS04 IC, thoes are cheap.
Ive been told by two professors (electrical engenners), one who build switching powersupplies, and the other who used large arrays of them. Both say I should always have a load attached to them to pevent a possibly damaged PS from being a damaged one. It makes the powersupply deviate from tolerances overtime by slightly changing the values of components. over time it WILL break your PS. It will "work", but it wont deliver correct voltages.
Ok heres how I check if its ok:
start with Xbox off
1) take apart your xbox as normal, remove the HDD, remove or keep plugged in and move aside, it dosent matter.
2) Place the black (negative) probe of the Voltmeter in the Molex plug (the plug should stay conected to the MB). Place the Black probe inside the top of the plug where a Black wire runs into (ive provided a picture)
3) turn on the Volt meter to the "20V DC" scale. DC is the V with a line and dashed line.
4) make sure that the red probe isnt touching metal.
5) turn on Xbox
6) with Xbox on start at the right and work to the left (skipping black wires) with the red probe.
Voltages should be near, and are seldomly at the nominal voltages. Expect a +- 10-15% tolerance.
Place th probe down into the Molex plug. There is no need to move the black probe or to check the other black wires.
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This is a (or rather 2) load resistors. 5W each. You need these in parallel with the 12V and 5V outputs if you want to run one by itself. This pic is part of a larger lab I did at school, so no need for two at the same time. Resistance of above 1k is
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_________________ -Scourge "Rx = +/_\"
a.k.a. President Skroob
The electronic ninja.
Xbox v1.6
Xenium Ice XOS v2.3
Xtender: Stock HDD+300G+300G
BIOS: Evox M8_16+
Dash: UX
custom-xmodz Xbox-HQ Freak
Joined: Aug 28, 2004 Posts: 796 Location: Wales, UK
Posted: Thu Dec 16, 2004 10:36 pm Post subject:
Hiya
I totally agree that it's a roulette, with customers machines I always use a grounded iron and am myself grounded. with my equipment I can never be arsed. I have had an xbox PSU on my desk as a test unit, has been there for over a year and is pretty much always switched on, not had any probs. I have done a lot of electronics for large companies carrying out repairs etc. Never had any prob there either.
It's one of those things, in theory it's dodgy, but in reality it's a little different. although I spent £160 on proper desktop vairable psu last week , time for a new osciliscope next I think
It's good advice your giving and it's good to be safe, but out of say a hundred machines, I have never had a problem, my father has done electronics for over 25 years, he's never had any probs either, maybe were just lucky, I dunno.
DJH
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, time for a new osciliscope next I think 
