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12541Testing a TIP120 transistor

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  • Joe Giliberti
    May 9, 2009
      One of my pinball machines (that was built it 1977 and uses a Motorola 6800-based computer for scoring, solenoids, etc, which (I think) makes this post on topic) broke down earlier today. I have reason to suspect a bad solenoid driver transistor, which are TIP120s. There're about 20 of them on the board, and I don't want to replace them all. Is there a means of testing them? I have a DMM and scope available.


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