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Conference giadev::decstation

Title:DECstation PC Conference
Notice:register note 2, see notes 3 & 4
Moderator:TARKIN::LININD
Created:Tue Jan 10 1989
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:7470
Total number of notes:34994

7367.0. "ASTEC Power Supply-High failure rate" by KAOFS::R_RYAN (I used to be a coyote but Im ok nowoooo!) Mon Mar 03 1997 12:31

    I was searching for information on the ASTEC 30-41069-01 Power Supply.
    We have a site with 25 780WW PCs in which these power supplies end up
    swapped at least once a year. The failure usually occurs on powerup and
    is due to the loss of 5 volts. My search on the net revealed that the
    30-41069-01 has been known to have some problems and should be replaced 
    with a 30-41069-02.
    Has anyone else heard of these problems? Is the exact problem with the
    30-41069-01 detailed anywhere? The customer wants to know what the
    difference between these two supplies is.
    Regards,
    Ron
T.RTitleUserPersonal
Name		DateLines
7367.1Also on 775WWs KAOFS::C_MENENDEZCARLOS, SOO ONT MCS (705)945-7862Tue Mar 04 1997 21:5311
    	Ron:
    
    	I swap a lot of those as well. The -02 variant has (at least on the
    ones I have seen) bigger chokes, which makes installation a bit more
    difficult. I believe the Prioris XL has the -02 variant as default, but
    I have swapped some of those as well.
    
    	The typical symptom is momentary lights, but then it's all gone. No
    fans and the drives never spin up. Is that what you have also seen?
    
    	Carlos
7367.2ThanksKAOFS::R_RYANI used to be a coyote but Im ok nowoooo!Wed Mar 05 1997 15:345
    I think in the cases we have seen that the 12v for the drives etc are
    still there. It's only the 5 volts that goes.
    The bigger chokes may help make the supply more robust. We'll see.
    Thanks and regards,
    Ron Ryan
7367.3Check with Kanata for answersKAOFS::C_MENENDEZCARLOS, SOO ONT MCS (705)945-7862Tue Mar 11 1997 15:1716
    	Ron:
    
    	I'm by no means a design guru, but IMO the chokes do nothing to
    make the power supply more stable. I would think they have more to do
    with protectin the other PC components from noise or RF or something
    like that.
    
    	Perhaps you might want to give Kanata a call and try to find an
    explanation for both (high failure and the purpose of these chokes).
    
    	Let me tell you one thing. These damn chokes make the installation
    of these power supplies almost impossible on the regular XL line of
    pcs. I don't know if the -02 variant is supposed to be used on XLs, but
    that's what logo sent me....
    
    	Carlos