(Topic ID: 292768)

Williams Comet: Jet Bumper Diode Orientation


By Matthew2000tx

11 days ago



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  • Latest reply 10 days ago by Matthew2000tx
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    #1 11 days ago

    I am looking over my work in Williams Comet Pop/Jet Bumper Rebuild I think I might have a diode in backward on a silnoid. Can someone with a comet confirm which end of the diode goes to which wire on the jet/pop bumbers.

    Thanks

    #2 11 days ago

    Looks like the schematics don't show the diode placement for every coil, but instead give a diagram that should cover most of the coils' wiring. You should have the power wire on the lug with the *banded* side of the diode. That goes for all the playfield coils on that game, as far as i can see (though the flippers are wired a bit differently).

    Screenshot_20210503_095853_com.google.android.apps.docs(1).jpg

    Might as well go over the rest of the coils and confirm proper diode/wiring orientation, as it will damage the driver transistor(s) on the driver board and possibly more if wired incorrectly.

    #3 10 days ago
    Quoted from frunch:

    Looks like the schematics don't show the diode placement for every coil, but instead give a diagram that should cover most of the coils' wiring. You should have the power wire on the lug with the *banded* side of the diode. That goes for all the playfield coils on that game, as far as i can see (though the flippers are wired a bit differently).
    [quoted image]
    Might as well go over the rest of the coils and confirm proper diode/wiring orientation, as it will damage the driver transistor(s) on the driver board and possibly more if wired incorrectly.

    Thanks this confirms that my pop bumper was wired up incorrectly.

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