(Topic ID: 296248)

Trying to diagnose bad playfield hole kicker (Zaccaria Space Mission)

By swampwiz

3 months ago

Topic Stats

  • 4 posts
  • 1 Pinsider participating
  • Latest reply 22 days ago by swampwiz
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    #1 3 months ago

    There is a hole at the top of the playfield which works properly sometimes, but other times actuates too weakly to pop the ball out, and sometimes nothing at all. The coil is a D.40 S.1200, which is cross-referenced with the Williams 26-1200, which I have bought to replace it with (the replacement coil officially says "AO-26 1200").

    So I've take the coil out of the housing and measured its R, L & diode:

    10.5 Ω

    10.6 mH

    0.011 each way

    The replacement shows basically the same readings.

    I'm not sure how to interpret the diode reading, other than to presume that there is a "short" through the coil itself, so a proper read on the diode is impossible.

    I'd like to think of everything I should try before swapping out the coil. I suppose I could try checking the elements on the driver board, but after that I have no idea.

    #2 3 months ago

    OK: I checked some elements for this coil, and I get (with the connector out) the same readings as for the set next to it that uses the same connector.

    RESIST: 360 Ω, 150 Ω

    CAP: 19.5 pF

    DIODE: .54, .704


    R1,B2: 0

    R1,B3: 0

    R2,B1: .555

    R2,B3: .303

    R3,B1: .503

    R3,B2: .299

    1 week later
    #3 3 months ago


    2 months later
    #4 22 days ago

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