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Thread: Slot Machine Help?

  1. #11
    Join Date
    Oct 2008
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    Kamloops, BC, Canada
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    Now that I've had a chance to feed a few hundred coins through the machine and actually played countless games I have started to find the other quirks of this machine that I can't really explain.


    http://i11.photobucket.com/albums/a1...e/CGS_7990.jpg

    1) The 2N3904 was not really a suitable replacement for a 3646. I ended up going back and replacing Q1, Q2 and Q3 with 2N222N's.
    Even then however, I still find that some segments will either be dim or flicker or can be brought back by smacking the cabinet. There has to be a loose connection somewhere.




    http://i11.photobucket.com/albums/a1...e/IMG_0368.jpg

    2) For the first five minutes or so after I turn the machine on I get games interrupted by tilt code -4- after the first or second reel indexes and locks. It's non-existant according to the documentation, but *4- (where * represents one of the three reels) does and indicates that while indexing a reel spun backwards.

    3) Also notice the TILT lamp is no longer on. The bulb reads continuity still but no power is getting to it.

    4) self-correcting tilts (like the one above) according to the manual should release the arm to replay but it does not. I have to reset the CPU to release the handle.

    5) None of the counters are working. I can play for a good 15 minutes and all the ram-resident counters will remain at 000 000. The ram and battery will however remember the last state it was in. or if it was in the middle of a payout. I can put three nickels in, turn it off for the night, turn it on the next afternoon and it will remember the coins inserted and be ready to play. Likewise the only mechanical counter in the machine is not working either, but I know it has previously back when the CPU was still randomly firing off outputs.

    6) The payout odds suck ass. I don't know how it's doing the game electronically but in the last two days I've only had four payouts out of way too many coins and hours. There are lots of off-by-one-notch moments but the reels are indexed, so it's not like there's a bug somewhere on them. The machine would immediately tilt.
    Last edited by NeXT; May 15th, 2018 at 09:17 PM.
    = Excellent space heater

  2. #12
    Join Date
    Oct 2008
    Location
    Kamloops, BC, Canada
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    A popsicle stick with emery tape glued to the ends makes an amazing contact cleaning tool.


    http://i11.photobucket.com/albums/a1...e/CGS_7998.jpg

    I pulled the reel and hopper assemblies and cleaned all the contacts. This has seemingly not only resolved the issue with the display not working correctly but for some reason both the electronic and ram resident meters have started working. Likewise the payout odds have sharply improved, so I'm riding on a hunch that odds are at least in part being generated using the meters.


    http://i11.photobucket.com/albums/a1...e/CGS_7997.jpg

    I also burnished the bulb for the tilt lamp to no avail and then proceeded to track the wiring back to where the fault was. The wiring eventually terminates at K14 on the Slot Interface Board.


    http://i11.photobucket.com/albums/a1...e/CGS_7975.jpg


    http://i11.photobucket.com/albums/a1...e/CGS_7976.jpg

    This board is not like the other boards I can find depicted on the internet. This version uses the now discontinued OFA1202 solid state relay.
    I traced the control side of the relay back to the CPU where it terminates on pin 3 of U6. I was able to easily see if it was changing signal states by making the machine tilt, and it was, so the relay was now suspect. Thankfully the interface board uses nothing but the same model solid-state relay so a simple location swap and the tilt light came back, confirming that at the relay was bad. I will have to do some research on what a suitable replacement might be.
    = Excellent space heater

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