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Testing with DMM help

Discussion in 'Hardware' started by the_slayer, Oct 2, 2008.

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  1. the_slayer

    the_slayer Thread Starter

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  2. cwwozniak

    cwwozniak Trusted Advisor Spam Fighter

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    Chuck
    Take a look at the pins on the motherboard where the start button plugs in. They are probably square. Find some solid wire whose diameter is close to the thickness of one of those pins. Copper wire is good but a straightened paper clip would work just as well. Too small of a wire will not make good contact and too large of a wire could damage the contacts.

    Cut two pieces of the wire to about one to two inches long each. Cutting the end that will go into the switch's plug at small angle may make insertion easier. Insert one wire into each for the plug positions for the start switch. Bend the wires apart a bit so that they won't touch each other.

    Connect the DMM's test leads to the DMM as shown in the photo in your first link. Set the DMM's function switch to the 200 Ohm (Greek omega letter) position. Without the leads toughing anything or each other, the DMM should read something like infinity, open circuit or overload.

    Place the plug with the inserted wires on an insulated surface and use the fingers on one hand to press on test lead against each wire. The DMM is outputting a small test voltage that should not shock you and the resistance of your skin is too hight to affect the test.

    The reading should not change from what you had with no connection. Then press the switch and the reading should drop to zero or just a couple of ohms. Releasing the switch should return to an open circuit reading.

    Be sure to turn the DMM off when you are done.
     
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