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Thread: help with micro switch

  1. #1
    Constant Bitrate
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    help with micro switch

    I have a IBM latop in a mini dock, docking station.
    I though I could just wire up an extension into the on/Off switch on the docking station.
    But when I opened it up the on/off button push against a rod that extend down to the main circuit board where there is a tiny switch.
    anyways, I can solder, no problem, BUT the little switch has 5 leads coming out off it!?!?!

    one side has 3 and the other side has 2.

    anyone know why the switch would need 5 leads??
    and switch 2 do I need to solder to turn it on??

    thanks

  2. #2
    Constant Bitrate
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    The top right pin has the word "SW1" near it, so I'm guessing that's one of them, still need to find the matching pin for that

  3. #3
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    more than likely there is still only 2 that need momentary contact with each other
    to start it..... picture?

  4. #4
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    ahh, pictures...

    just test the 4 corner ones.... pick one, then touch it with a jumper to one of the others..... continue until it starts..... those are them....

  5. #5
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    Often times there are redundant leads on surface mount tact switches like the one in the picture. Looks at the traces on the PCB and see where they go. You will see that that there are only two different traces leading away from the switch. They usually have 4 leads. I have never seen one with 5. Maybie there are two common pins, a normally open and a normally closed.

  6. #6
    Constant Bitrate BassBinDevil's Avatar
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    Try measuring between the different leads with a voltmeter. If you find a voltage, keep the leads connected and push the button, and see if the voltage goes to zero when the button is pressed.

  7. #7
    Constant Bitrate
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    Quote Originally Posted by BassBinDevil
    Try measuring between the different leads with a voltmeter. If you find a voltage, keep the leads connected and push the button, and see if the voltage goes to zero when the button is pressed.

    Shouldn't voltage only go throught when the button is pressed??

    finally found my volt meter
    OK, I've found that when I have connectors on
    the top left and bottom right pins AND the button is pushed I get connectivity.
    (when the button is released, connectivity is broken)

    On the other hand, without holding down the button
    I only get connevtivity on the Top left and Top right pins
    BUT there is NO change if the button is pushed......

    Right now I'm guessing I should use the first scenerio, right?

  8. #8
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    dude, it really is as simple as test jumping one by one to see which one fires it

  9. #9
    Constant Bitrate
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    Quote Originally Posted by turbocad6
    dude, it really is as simple as test jumping one by one to see which one fires it
    yeah, I just don't wanna fry the board (it's happened before in the past )


    I'll give that a try tomorrow, time for some sleep

  10. #10
    FLAC W3bMa5t3r's Avatar
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    Check out my sig as well. Lots of good info from numerous users. Covers this a few times. Laptop Power On Module

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