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Conference mvblab::sable

Title:SABLE SYSTEM PUBLIC DISCUSSION
Moderator:COSMIC::PETERSON
Created:Mon Jan 11 1993
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2614
Total number of notes:10244

2590.0. "Power problem of Alpha 2100" by HGOM30::THANHSON () Wed May 07 1997 01:21

    Hi,
    
       We have received 9 Alpha server 2100 4/200 ( Old model) for Demo.
    Now, there is a problem with power supply (PS).
       Three machines are not able to power up. I have checked the LEDs at
    back of theses machines ( These LEDs are on PSs), they are green steady.
    As I understand, LEDs indicate that AC input is OK only.
    
       If anyone can introdue me how to trace out which part is deffective ? 
    It may be PS, operator controll panel or I/O card ?    
    
       Since we do not have much experience on this model, please clarify ?
    
    Thanks,
    
    Son. 
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2590.1Power problem of Alpha 2100CSC32::HUTMACHERWed May 07 1997 12:0213
    theres a interlock switch on left side of ocp panel 
    this switch is made by a tab on the left side cabinet door when its
    closed. may want to check this area and its cabling back to the
    SIO module for problems.
    
    just some ideas
    
    could use known good power supply, ocp panel and its cables, and SIO
    from good system?
    
    jim hutmacher mvhs colorado csc 800-354-9000 ext 25561
    
                     
2590.2KANATA::TOMKINSWed May 07 1997 16:2018
    On some older machines that were demos, the switch inside the OCP was
    actually impressed upon by the screw that was used to hold the side
    panel shut, rather than the later design of a metal tab.
    
    In any event, the interlock clearance from on to off is extremely
    small, less than 1/32 of an inch in most cases. As you screw the door
    shut, and if you listen real carefully you will hear the micro-switch
    click.
    
    If the screw is loose, ie; the threads in the metal frame have worn
    down, you could use a pair of ViseGrips to flatten the punched hole out
    somewhat, which would re-enable the screw to grip, or, you could use a
    Phillips screwdriver to impart a star shape on the hole such that the
    screw has a little extra metal to grip. These band-aids are of course a
    last recourse and you should start looking for a screw of equal length
    but larger diameter.
    
    rtt