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AT power supply
sibrag Dec-29-00 07:17 AM
A couple of weeks ago the power supply in my AT based system begun making some nasty noises. This evening I opened up the power supply case and found out that the cooling fan located inside it was the culprit. It is CHEAPLY made. I would like to, if possible, replace just the fan, rather than the whole power supply, however, I am uncertain if the fans are all pretty much a standard size and specs (power consumption, etc), or do they vary based on power supply manufacturer.

Any suggestions would be greatly appreciated.


1. RE: AT power supply
lbyard Dec-29-00 05:51 PM
In response to message 0
One normally replaces the power supply. The fan plus the labor to install it usually exceeds or is equal to the cost of a new power supply. Some customers have a problem understanding this fact. There are several standard sizes of muffin fans, several kinds of bearings, and many variations in air flow and mean-time-to failure specifications. If the fan is cheaply made, the rest of the power supply is probably cheaply made as well. Larry

2. RE: AT power supply
sibrag Dec-30-00 03:17 AM
In response to message 1
Thanks Larry.

3. RE: AT power supply
diletante Jan-03-01 02:20 PM
In response to message 2
Are ATX power supplies built with a standard mounting interface? Are the mounting interfaces proprietary? Can a 250W supply be replaced with a 300W supply without mounting problems? (Same questions for AT supplies.)

In my case, Enlight ATX (just out of warranty), the fan moans at start up, so I am thinking about a new power supply. It might be a good idea to get a quality power supply. Any recommendations? Rob

4. RE: AT power supply
lbyard Jan-03-01 02:52 PM
In response to message 3
Rob, Most any ATX supply should do. In both cases (punÖ) one can normally upgrade a 250 Watt supply to a 300 Watt supply without difficulty. I normally use Antec and AOpen power supplies. The Antec 300 Watt power supply (http://duxcw.com/digest/Reviews/Cases/antec/ks282.htm) is better than the AOpen supplies I have seen, but you would do well with an AOpen 250-Watt supply (http://duxcw.com/digest/Reviews/Cases/aopen/hx45a/hx45a.htm). AT power supplies with the PS/2 form factor are pretty much interchangeable, but I have had problems finding them. Some AT computers have oddball power switches, but most have round push buttons and most power supplies now come with the power switch soldered-on (and shrink wrapped) to the cable going to the supply. Older ones have four (spade?) clips on the cable that push onto terminals on the switch. I donít believe these are as safe as those that are soldered on to the cable. Usually, in both cases, the switch is the same and is interchangeable. But there are exceptions; e.g., some Packard Bell supplies/computers. Many of these switches have break-off points on the shaft to which the case plunger attaches, so the length can be adjusted to work properly with plunger. In addition to the motherboard power-off function activated by a front panel switch, many ATX power supplies now come with a power switch on the back of the supply itself. I find this handy for working on computers, but not a major reason to buy or not buy a power supply. The last Antec 300 Watt ATX power supply I saw did not have the switch. I have two more of them on order and they may have the switch. The AOpen supplies I have seen recently have the switch. The length of the power supply cables (a possible indicator of a cheap power supply) may be an issue in large, full tower cases, but a Y cable (splitter) may add enough length to fix that problem. Larry

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