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Help identifying diode

Discussion in 'Electronic Components' started by jonte42, Jun 24, 2006.

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  1. jonte42

    jonte42 Guest

    Trying to repair display/electronics card in Miele microwave oven,
    cirka 1990 (it's custom built into kitchen panel, so I prefer keeping
    it if it's possible).

    I have this shorted diode, it's part of the power supply to the card:

    It has plastic body, 5 mm length.

    The label: A12 J 9H
    And the "J" is 50% larger than the other characters.

    I have spent hours on google trying to identify it and/or finding an
    equivalent, but no luck.
    No circuit diagram, and I'm not skilled enough to determine it's
    function, could be a Zener diode.

    So please, any tips on how to identify it are welcome!

    Jonatan Lindell
  2. Franc Zabkar

    Franc Zabkar Guest

    Could it be something like a BZX79-A12 12V 0.5W zener? The "A"
    indicates 1% tolerance. The "B" and "C" versions have tolerances of 2%
    and 5%, respectively.

    If the diode is part of a simple linear zener regulated power supply,
    then there should be an electro in parallel with it, and a resistor in
    series. The zener may drive the base of a pass transistor.

    - Franc Zabkar
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