Need help with Power Supply

Discussion in 'Electronics Resources' started by Jack_K, Sep 5, 2012.

  1. Jack_K

    Thread Starter Active Member

    May 13, 2009
    115
    0
    I have an AC-DC Electronics power supply model OEM12N9.5.
    It just died. I checked the transistors and one of the pair seems to be open. It's labeled STI (best I can read) 54-031. It's a PNP in a TO-3 case.

    There are two of them, one checks OK with an ohmmeter, the other doesn't. The pair are driven by a 2N5956 in a TO-66 case. The 2N5956 checks OK.

    I'd like to repair the supply but I can't find any info on the STI transistors.

    Would any good PNP power transistors work instead?

    Thanks in advance.
    Jack

    P.S. Not sure this is the proper forum, so move me if necessary.
     
  2. wmodavis

    Well-Known Member

    Oct 23, 2010
    737
    150
    google 2n5956
     
  3. Jack_K

    Thread Starter Active Member

    May 13, 2009
    115
    0
    I did. I need the other transistors.
     
  4. Tealc

    Member

    Jun 30, 2011
    140
    10
    Maybe a close up picture of the transistor might help.
     
  5. Jack_K

    Thread Starter Active Member

    May 13, 2009
    115
    0
    Here's a pic.
     
  6. Jack_K

    Thread Starter Active Member

    May 13, 2009
    115
    0
    No ideas on these transistors?

    Does anyone possibly have a schematic for the AC-DC OEM12N9.5 power supply?

    Jack
     
  7. t06afre

    AAC Fanatic!

    May 11, 2009
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  8. Jack_K

    Thread Starter Active Member

    May 13, 2009
    115
    0
    Thanks! That really helps.
     
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