(Topic ID: 68937)

Coils

By kurtackerman

10 years ago



Topic Stats

  • 10 posts
  • 5 Pinsiders participating
  • Latest reply 10 years ago by mg81
  • No one calls this topic a favorite

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    #3 10 years ago

    Yes, yes and yes.

    What normally happens is the coil doesn't get switched off when it should.
    Too much current causes the heat to burn the coil and gets shorted.
    The short then damages the transistor.
    The driving transistor (if present) normally gets damaged as well, which is not always that obvious.

    #6 10 years ago

    I always test transistors on the diode setting of the DMM. I compare the values with similar circuits. If the values are the same the transistor is good.

    E.g. my last measurement on a Bally solenoid driver showed .68 for a certain pin combination, when all of the other circuits were .53. That transistor was partially conducting (so to speak) so the gate was not (fully) energized, but when I moved it by hand it stayed in that position. Replacing the transistor solved the problem.

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