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Bad blower (fan) in Astec RS-PSU-450-AC1N

NMB blower BL4447-04W-B49 Cannot locate exact part. Suffix B49 indicates speed sensing fan, all I can find is fixed speed. I could replace the ball bearings, but that is assuming I can find the small ball bearings NMB L-940ZZ.

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  • n1119 Nov 29, 2008

    That would keep thing cool all right, but I suspect if the power supply logic couldn't sense commanded speed changes, it would post an error on the status LED, which is what I'm trying to clear in the first place. Alpha ES-45s do that, for example, and you sometimes need to go through 3 or 4 fans to find one the logic likes. I don't know if the ASTEC supply is that smart, but I'd prefer the exact fan so I don't have to do it twice.

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If you cannot find a exact replacement, don't worry, use a fixed speed fan, you only want to keep things cool, you care what speed it runs at as long as it does its job, and it is easier than replacing the bearings

Posted on Nov 29, 2008

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Hi I try to troubleshoot the ASTEC 450W power supply. I don't know how to power up. Anyone can help me with this problem. Thanks. My email is trinhluu62@yahoo.com


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The green light is blinking on the supply unit but it not coming on or booting up , i need to know if the supply unit is bad


Close examination of your power supply may reveal if the psu is bad.

When the power supply is plug in ac socket the green indicator led inside the motherboard will lit steady green. See if by turning on the cpu you will see some sparks in the power supply connector attached to the motherboard. This is a clear indication of a bad or shorted psu.

You can also smell if there is a burning inside the psu.

See if the fan inside the psu is working if not then its a clear indication of a bad psu.

Using a multimeter if you have one measure the dc voltage coming from the supply connector. Insert the black probe to one of the black wires in the connector. And the red probe to the red wire in the connector. the reading should be +12VDC. Put the red probe to the red wire and it should read +5VDC. Any readings below this, means bad psu.

Measure also the output voltage when there is a load in the power supply. Connect a CD-ROM drive or hardisk and measure again the voltage. Dropping of voltage when put some loads is a clear indication of a bad power supply unit (psu).

I hope this will help you.
Thank you for using Fixya!

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