(Topic ID: 231641)

Gottlieb System 3 Coil & Switch Issues


By JReedie

1 year ago



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  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 1 year ago by wayout440
  • Topic is favorited by 1 Pinsider

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    #1 1 year ago

    I've got a customer who has a Street Fighter 2 and it's giving me a real hard time. He called me out as he could smell something burning the last time the machine was used. I've replaced 2 coils that were completely burnt to a crisp, fixed a GI short and now I'm stuck banging my head against the wall.

    Right now the Q/game relay does not fire at all when a game is started (the coil has been tested and even swapped to another position and is works) I have the left upkicker coil locking on as soon as the game is powered up - for now I disconnected it. The ball release coil in the trough doesn't fire at the start of a game either but all coils work work during a burn-in test (obviously besides the one that locks on)

    When you try to start a game it boots up players and then goes straight into ball search, after about 5 seconds the machine displays "balls stuck call service person". Also in the switch test the machine is reporting probably about 20 switches as inoperative yet none of them complete a row or column in the switch matrix.

    I reflowed solder on the ground board by the transformer to ensure there's no ground issues which seem to plague system 3 machines. Do any Gottlieb gurus have any suggestions on where to start?System 3s are not my specialist subject so starting to feel a little lost with this one!

    James

    #2 1 year ago

    I would start with the ribbon cables. Reseat them first. If that doesn't change things, any ribbon cable that can be, swap them end-to-end making sure it doesn't get twisted. i.e. if the stripe goes to the last pin on one end now, make sure it goes to the same pin on the other end...if that makes sense.

    Also, you can reseat socketed chips by prying one end up a bit then pressing it back down. Then press on each end until it's back down snug.

    Any change?

    #3 1 year ago

    Push tournament switch and look at plays options on Dot Matrix menu

    #4 1 year ago
    Quoted from cody_chunn:

    I would start with the ribbon cables. Reseat them first. If that doesn't change things, any ribbon cable that can be, swap them end-to-end making sure it doesn't get twisted. i.e. if the stripe goes to the last pin on one end now, make sure it goes to the same pin on the other end...if that makes sense.
    Also, you can reseat socketed chips by prying one end up a bit then pressing it back down. Then press on each end until it's back down snug.
    Any change?

    Do not do this with the power on. If you reseat the DMD cable with the power on you will fry the dot matrix controller board GAL chip. http://www.pinrepair.com/sys3/

    Keep in mind that momentary coils burn out only when they are being kept on longer than normal by some other problem. Test all the driver transistors.

    See section 2i. Switch Problems and the Switch Matrix. http://www.pinrepair.com/sys3/ keep in mind that lamp and switch strobes are shared:
    Because the Lamp Matrix and the Switch Matrix share the same twelve strobe lines, a shorted lamp socket can cause havoc with the Switch matrix. Also the organic flux used on Gottlieb lamp sockets can cause lamp shorts, which in turn can cause strange and mysterious switch matrix problems.

    A further test of the driver board can be conducted by putting the game into switch matrix test. Then remove the upper left corner A3P3 connector. Using an alligator test lead connected to the strobe pin in question, touch the other end of the alligator lead to any pin of the switch matrix column A3P5 connector at the lower left corner of the driver board. This should show a switch closure in the switch matrix test. This will prove if the driver board is at fault or not.

    #5 1 year ago

    Or follow those common wires...if only one is unsold all switches links to this common wire will not work.
    (This schematic came from a Stargate but is common to Gottlieb System 3 pinball) just follow the "tournament" common wire...I think but it could be another one

    20181215_123350 (resized).jpg
    #6 1 year ago
    Quoted from Benhurr:

    Or follow those common wires...if only one is unsold all switches links to this common wire will not work.
    (This schematic came from a Stargate but is common to Gottlieb System 3 pinball) just follow the "tournament" common wire...I think but it could be another one
    [quoted image]

    That makes sense but my issues are not specific to one column or row in the matrix, the switches that are ‘inoperative’ are scattered all around the matrix

    #7 1 year ago
    Quoted from JReedie:

    That makes sense but my issues are not specific to one column or row in the matrix, the switches that are ‘inoperative’ are scattered all around the matrix

    That's why you need to read the links in the post I sent previous to that one.

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