Testing MB104 bridge rectifier

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  • cmj21973
    Badcaps Veteran
    • Feb 2010
    • 267
    • USA

    #1

    Testing MB104 bridge rectifier

    I'm need to know if this bridge rectifier is still good to use.
    The outer casing broke apart while removing it from the PCB. I can super glue it back together but, it has a small heat sink that attaches to it.

    DMM diode test:

    (+) (-)
    probe probe

    1) + - OL
    2) - + .986
    3) AC1 AC2 OL
    4) AC2 AC1 OL
    5) + AC1 OL
    6) + AC2 OL
    7) AC1 + .525
    8) AC2 + .528
    9) AC1 - OL
    10) AC2 - OL
    11) - AC1 .540
    12) - AC2 .527

    I'm thinking to replace it since I have to glue the outer case back together and bolt a heatsink back on it.
    Also because of the #11 reading.
    Attached Files
    Last edited by cmj21973; 01-15-2012, 11:54 PM.
  • Jack Crow
    It's a CLASOB!
    • May 2008
    • 823
    • USA

    #2
    Re: Testing MB104 bridge rectifier

    CMJ,
    Rule of thumb.
    If the case is cracked the part is gone.

    Semiconductors and oxygen make a real poor mix.
    Don't trust it. Don't glue it. Toss it as fast as possible.

    As for testing, I use this gizmo.
    I call it my cheap curve tracer.
    With a scope in X/Y mode, you can use it to do a very quick check of diode junctions and other parts.

    With a diode across the probes the sharper angle where conduction happens the better the junction is.

    http://www.flickr.com/photos/9010884...8650/lightbox/

    Hope this helps.
    Jack Crow in VA
    "You are, what you do, when it counts"
    The Masso

    "Gravity, the quickest way down"
    Mayor John Almafi

    "You ever drop an egg, and on the floor you see it break?
    You go and get a mop so you can clean up your mistake.
    But did you ever stop to ponder why we know it's true?
    If you drop a broken egg you will not get an egg that's new?"

    MC Hawking

    Comment

    • cmj21973
      Badcaps Veteran
      • Feb 2010
      • 267
      • USA

      #3
      Re: Testing MB104 bridge rectifier

      Originally posted by Jack Crow
      CMJ,
      Rule of thumb.
      If the case is cracked the part is gone.

      Semiconductors and oxygen make a real poor mix.
      Don't trust it. Don't glue it. Toss it as fast as possible.
      It's like a ceramic cup with the internal components encapsuled in epoxy. I was more concerned with heat transfer and the super glue not holding due to temperature.

      I'll order a new one.

      Comment

      • jetadm123
        Badcaps Legend
        • Feb 2010
        • 2169

        #4
        Re: Testing MB104 bridge rectifier

        Readily available through digikey:

        http://search.digikey.com/scripts/Dk...b104+rectifier

        Comment

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