Testing a full-Bridge Rectifiers diode Component

Discussion in 'Electronic Repair' started by mikuzj5@yahoo.com, Sep 10, 2005.

  1. Guest

    G'day..
    I Need to know how to test this 4 legged single piece component what a
    belive is a (Rectifier diode) gotten out of a computer power supply,
    which now i suspect of being bad. No is KBL406G, and it has a + and -
    marked on the first and last leg 4 all together.

    The diode looks simmilar to the following..
    http://www.radioshack.com/images/ProductCatalog/ProductImage/276/276-1146.jpg

    Does anyone have a good diagram with discription on testing these
    component.

    Thanks.
    , Sep 10, 2005
    #1
  2. Graham Guest


    > G'day..
    > I Need to know how to test this 4 legged single piece component what a
    > belive is a (Rectifier diode) gotten out of a computer power supply,
    > which now i suspect of being bad. No is KBL406G, and it has a + and -
    > marked on the first and last leg 4 all together.
    >
    > The diode looks simmilar to the following..
    >

    http://www.radioshack.com/images/ProductCatalog/ProductImage/276/276-1146.jpg
    >
    > Does anyone have a good diagram with discription on testing these
    > component.
    >
    > Thanks.



    What was the problem with the PSU?
    Did the mains fuse blow violently at switch-on?

    Check each leg of the bridge to the other 3 legs with an ohm-meter and see
    if any of the diodes are short-circuit.



    --
    Graham.



    %Profound_observation%
    Graham, Sep 10, 2005
    #2
  3. Art Guest

    DMM, From the AC inputs, the two that may not have any marking. Black lead
    to + terminal. DMM in diode check mode. Should show conductance front all
    the other leads to the Black Test lead attached to the + Terminal. Inverse,
    connect the Red Test lead to the - Terminal, again they should show
    conductance from all the leads to the Red Test lead connected to the -
    terminal. Reversing the Test Leads, I.E. Red to + or Black to - should show
    infinite resistance, no conductance. Just 4 diodes and you are checking the
    front to back resistance/conductance.
    <> wrote in message
    news:...
    > G'day..
    > I Need to know how to test this 4 legged single piece component what a
    > belive is a (Rectifier diode) gotten out of a computer power supply,
    > which now i suspect of being bad. No is KBL406G, and it has a + and -
    > marked on the first and last leg 4 all together.
    >
    > The diode looks simmilar to the following..
    > http://www.radioshack.com/images/ProductCatalog/ProductImage/276/276-1146.jpg
    >
    > Does anyone have a good diagram with discription on testing these
    > component.
    >
    > Thanks.
    >
    Art, Sep 10, 2005
    #3
  4. James Sweet Guest

    <> wrote in message
    news:...
    > G'day..
    > I Need to know how to test this 4 legged single piece component what a
    > belive is a (Rectifier diode) gotten out of a computer power supply,
    > which now i suspect of being bad. No is KBL406G, and it has a + and -
    > marked on the first and last leg 4 all together.
    >
    > The diode looks simmilar to the following..
    >

    http://www.radioshack.com/images/ProductCatalog/ProductImage/276/276-1146.jpg
    >
    > Does anyone have a good diagram with discription on testing these
    > component.
    >
    > Thanks.
    >


    I use the diode check function on my multimeter, a bridge rectifier is just
    four diodes connected around.
    James Sweet, Sep 10, 2005
    #4
  5. Guest

    Yes that is exactly what has happened the fuse blew first. I change
    the fuse with another one of the same rating turned on the unit and the
    fuse blew again.
    For the Second time with two fuses blown i changed it for the last time
    and decided to turn the unit power on again only this time the fuse
    remained intact, to my suprise. In testing the power unit Further i
    found that a near by 1w 1.6 ohm resistor blew silently, this is located
    not far from the fuse itself. Each time i replace this resistor with
    the same one it just gets knocked out each time before the fuse does. I
    hope that explains a bit of what went wrong.
    , Sep 11, 2005
    #5

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