(Topic ID: 208090)

System 9 owners: quick help requested

By jimy_speedt

1 year ago

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  • 6 posts
  • 2 Pinsiders participating
  • Latest reply 1 year ago by wayout440
  • No one calls this topic a favorite


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    #1 1 year ago


    I have extracted these questions from another topic as they are more specific.

    On a williams Comet, a tricky stuff has been added that I d like to remove. I try to restore a few original connections, between the cabinet and the boards.

    1. Where does the start button connects to ?
    2. Where do the wires MPU 1J10-3, PS 3J3-8, 3J6-14, 3J6-3 go ?

    I read the manuel which does not give a clear description


    #2 1 year ago

    Just from looking at the schematics in the manual, the start (credit) button connects to the switch matrix, in theory you can tap off of any of the switches for the row and column. The green/brown is definitely tied to the plumb bob. The white/orange runs in the wire harness of the cabinet to the back of the game and then up to the playfield. I think the C-jump upper ring switch may be the closest.

    For MPU IJ10-3, that is row 6 in the matrix, so run to any of the closest playfield switches in row 6 (white/blue wire) - probably top lane number "8" switch.

    I can look at the rest later on my game, so if you still have questions shoot me a message later today.

    credit (resized).jpg

    credit (resized).jpg

    #3 1 year ago

    Great wayout,

    I had not made the link between credit button and start button, so I have not found the start button on the switch matrix. Indeed it is the credit button.

    thanks a lot for your time. It is really helpful

    #4 1 year ago

    Your welcome...it's a start (pun intended )

    #5 1 year ago


    The switch matrix connection with the coin door and "Credit button" are ok. There was a mix on the door between wires, The wiring on the left coin chute is restored, and I have shortcut the 2 others. Check is ok (slam tilt as well).

    For the power board wiring, I can remove the additional wires that were used to feed the tricky board.

    Now back to the other problems of restart of the machine.

    Thanks again wayout

    #6 1 year ago

    Your welcome.

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