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Thread: Computer Pachinko missing a couple of ICsI

  1. #21
    Tokie Owens mantaramian's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Here are the Pictures of PCB Board.

    Can anybody HELP?, Currently the game will function except for the scoring. Does anybody have any sugestions?
    Attached Images Attached Images

  2. #22
    Tokie Owens mantaramian's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Since nobody was able to provide me any direction I took it upon myself to determine the problem.

    1st I mapped out all of the IC's since they were in sockets.

    2nd I identified each IC by the part number.

    3rd I would remove the IC's and power the game up to identify the functionality of the IC's

    3rd I would swap two of the identical IC's positions to see if there was any differance in the function of the game.

    I found two IC's that would affect the scoring, I swapped them and the scoring would function again. So I went to FRY's and got two NTE replacements and my pachinko works again.

    I hope this informatin will help somebody in the future.

    Mike

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  4. #23
    Scowlin' Jean Hornigold hanabi's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    I'm sure this valuable information will be of use to other members in the future

    Many thanks for posting and congrats on getting your Pachinko operational again!!

    Angie ...
    Pachinkos, Pachislos, Coffee, Papercraft Ninja, Pinball

    I ran away with the Steampunk Circus!
    I was hiding in a room in my mind...
    You crush the lily in my soul...



  5. #24
    Pachi Puro Moparformances's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Quote Originally Posted by mantaramian View Post
    Since nobody was able to provide me any direction I took it upon myself to determine the problem.

    1st I mapped out all of the IC's since they were in sockets.

    2nd I identified each IC by the part number.

    3rd I would remove the IC's and power the game up to identify the functionality of the IC's

    3rd I would swap two of the identical IC's positions to see if there was any differance in the function of the game.

    I found two IC's that would affect the scoring, I swapped them and the scoring would function again. So I went to FRY's and got two NTE replacements and my pachinko works again.

    I hope this informatin will help somebody in the future.

    Mike
    great information.. would it be possable to post what circuit boards were faulty and a picture of there location.. for future use
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  7. #25
    Tokie Owens mantaramian's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Quote Originally Posted by mantaramian View Post
    Since nobody was able to provide me any direction I took it upon myself to determine the problem.

    1st I mapped out all of the IC's since they were in sockets.

    2nd I identified each IC by the part number.

    3rd I would remove the IC's and power the game up to identify the functionality of the IC's

    4th I would swap two of the identical IC's positions to see if there was any differance in the function of the game.

    I found two IC's that would affect the scoring, I swapped them and the scoring would function again. So I went to FRY's Electronics and got two NTE replacements and my pachinko works again.

    I hope this informatin will help somebody in the future.

    Mike
    The two IC's I was referencing were U12 an U14 You can see the Circuit board from an earlier post of mine

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  9. #26
    veneratio million deus Eddie's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Led Zepplin

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  11. #27
    Blind Shooter Greg Lockhart's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Hello,
    I thought I would revive this old thread rather than start a new one... because I'm working on a computer pachinko that looks to be exactly like the one ACMech was dealing with. The posts in this thread have been helpful... but I haven't been able to solve the problem with this machine. The score counter works intermittently and the payout solenoid does not work.
    I've tried moving similar IC's into different sockets but it hasn't changed anything.
    Is the problem most likely in these IC's? If so, I would buy a few of them (there are 9 different ones) and just start replacing them one at a time until something happens.
    Where can you get them and are they very expensive?
    I'd really like to get this machine working. Everything else is in good condition and it seems like it would be a lot of fun to play.
    Any help would be appreciated.
    Thanks, Greg

    100_3714.jpg100_3712.jpg100_3716.jpg100_3717.jpg100_3718.jpg

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  13. #28
    Kungishi ballsofsteel's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    The CD4000 series ICs are cheap and plentiful. https://greatplainselectronics.com/products.asp?cat=11

    The CA series that I couldn't make out the number on is mostly obsolete and harder to find.
    "Knowledge is good." - Emil Faber

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  15. #29
    Blind Shooter Greg Lockhart's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Thanks ballsofsteel,
    I'm a little confused on the numbering system of these IC's.
    The ones I have are numbered CD4001AE, CD4013AE, CD4029AE etc.
    The ones from the Great Plains Electronics website have numbers that have different ending letters... CD4001BE, CD4013BE, Cd4029BE.
    Are they the same part... maybe just with different part numbers from different manufacturers?
    They are cheap enough.. I could get a couple of each that are on this board and just switch them out until I find a faulty one... if I thought one or more of these was the most likely problem.
    There are three relays (I think) on the board that are all the same number. I switched them around but it didn't seem to change anything... so I'm assuming they are OK.
    The payout solenoid that isn't working is OK I think... I hooked it up to a 12v source and it does work... it apparently isn't getting power from the board.

    Any ideas as to possible problems with these boards would be greatly appreciated.
    Thanks

  16. #30
    Sandwich Shooter browne92's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Chips with the A suffix are unbuffered, chips with the B suffix are buffered. Without going into a long technical explanation, the B suffix chips will work fine in your application.
    pachinkoparts.com - Home Page
    Definition: Racecar-a device that turns money into noise.

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  18. #31
    Blind Shooter Greg Lockhart's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Thanks browne92... that's good to know... looks like I can get these IC's easily enough if I decide to replace them.
    I'm hoping others here with experience with these machines might know if these IC's are most likely the cause of the problem or if it could be something else... ball payout does not work and score works intermittently.
    Thanks

  19. #32
    Sandwich Shooter browne92's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Intermittent operations sounds more like bad connections than faulty chips. Step one would be to clean both sides of that long edge connector. Pencil erasers work well for that.

    Do you have and know how to use a volt-ohm meter? If not, you should. You can pick up a cheapie VOM from Horrible Freight, sometimes they even have a coupon to get one for free. It will let you check for good, clean power, a must have with logic chips. It will also help trace bad connections and faulty chips.
    pachinkoparts.com - Home Page
    Definition: Racecar-a device that turns money into noise.

  20. #33
    Kungishi CarlW's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Browne92 probably knows more about this than me.

    Didn't PCB's from that era have a problem with undesired corrosion that was somehow built into the board? This got corrected after a few years?

  21. #34
    Blind Shooter Greg Lockhart's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Thanks Guys,
    I do have a volt-ohm meter... but have limited knowledge of how to use it... I can check voltage and continuity.
    On a board like this what would I check and what would I be looking for? How do you check the IC's?
    I have cleaned the long edge connector.
    I don't see any noticeable corrosion or broken solder joints anywhere on the board.
    Thanks

    100_3770.jpg100_3771.jpg

  22. #35
    Sandwich Shooter browne92's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Carlw, the only corrosion problems I remember was in the edge connectors. That's where the pencil eraser trick came from. All that went away when they started gold plating the connectors.

    100_3770.jpg

    I've never worked on one of these before, so these are just educated guesses. Measure DC volts across the big blue capacitor. My guess is you'll get 12 to 18 volts. That's the unregulated supply for the solenoids and relays. Then look at the circled component. If it says 78XX on it, with the "XX" being a 2 digit number that represents the voltage, that is the regulator for logic supply. 4000 series logic will work with voltages from 3 to 18 (IIRC), but they usually used 5. What ever voltage they choose, it must be held constant. That's what the regulator does.

    To check the IC's, you'd have to know the logic behind each chip, which is easy enough to find out. You measure the inputs and outputs and see if they conform to what each chip is supposed to do. It's not a difficult job, just tedious.

    But I still think you have connection problems. You could try removing each chip and putting it back in. Sometimes they get a little corrosion between the pins and sockets, and that will knock it off. A squirt of contact cleaner (my fav is Deoxit) helps too. You might need to clean the contacts on the switches or relays. Most folks use a point file or needle file, but I find them a little too aggressive. I use a contact burnisher. Check with your local electronic supply house for one of those.

    If you want to try changing chips until it works (a process we call 'shotgunning' in the technician's world), keep in mind that can be a frustrating and expensive way to fix something. Especially if the problem isn't on the board.

    Good luck.
    pachinkoparts.com - Home Page
    Definition: Racecar-a device that turns money into noise.

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  24. #36
    Blind Shooter Greg Lockhart's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Thanks for trying to help me browne92... it is much appreciated.
    The voltage across the big blue capacitor is 18 volts... tested when the power is on. When I test the capacitor with my multimeter (looking for 4700 uF) I get wildly different, erratic readings... different each time I check it... the meter reads in nF... and I don't know if I'm testing it correctly... so I may be doing something wrong. I took the capacitor out of circuit and still get erratic readings. Could that be a problem?
    The component you have circled... regulator?... is marked FUA78
    M12UC
    7629
    Does that mean anything?
    I've looked at this board with a magnifying glass looking for broken solder joints, corrosion and contact between pins and sockets... it all looks fine.
    Any ideas?
    Thanks Again
    Greg

  25. #37
    Blind Shooter Greg Lockhart's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Bump
    Still hoping to hear from anyone with ideas about what might be wrong with this machine.
    Thanks,
    Greg

  26. #38
    Kungishi CarlW's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    Did you try swapping IC's out?

  27. #39
    Blind Shooter Greg Lockhart's Avatar
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    Default Re: Computer Pachinko missing a couple of ICsI

    I tried switching around IC's with the same number into different sockets but it made no difference... so I'm wondering if it makes sense to buy a few new ones to try.
    I'll eventually do that unless I come up with a better idea.

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