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AskJacob

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Posts posted by AskJacob

  1. Since getting a decent scope, this poor guy has sat on my shelf unused... Time to move it on.

    Dick Smith Electronics K-7337 assembled by me a long time ago. I will re-calibrate it before shipping - although it isn't a high performance device with 4 digit display.

    I will throw in a probe to go with it. It needs a power supply of ac or dc 7.5v to 12v (it has an internal 5v regulator supply) - i used to just use the bench supply for it.

    Happy for a beer + postage. what does a beer go for at the pub these days? Call it $5?

     

    SIideways pic because lazy:

     

    51089542_2022-02-0513_56_51.thumb.jpg.cc77ca2a12ee095dfaa509af74749e87.jpg

     

  2. Sure, it could be OK. If you are basically just wanting a glorified logic probe, where you are checking if pins are toggling etc and comparing levels, looking for noise. You can certainly use a 10mhz scope for a lot of that stuff, especially on older boards that have lower clock speeds than modern ones - as this was pretty much the tech at hand at the time.

    I sold my old scope for $35 about 10 years ago if that helps you get your head around the price for one of those "boat anchors" 😄

    Finally, if you are wanting an analog scope for the cool factor, then just get one! If all else fails you can just hook it up to the stereo and use it as a visualizer 🙂

    • Like 1
  3. with an analog scope, be careful regarding the bandwidth. The higher you try and measure, the dimmer the trace will be. 5mhz will be hard to see, and 10mhz will be guesses.

     

    So with that in mindm you want to aim your analog scope bandwidth around 2x higher than the kind of signals you want to measure. I started with that exact scope pictured there - and got frustrated very quickly with it trying to work with digital stuff.

     

    If you can get your hands on a cheap digital scope, like a Rigol 50 of 100mhz model you can get all your bases covered. Neat things with the DSO are on screen measurements of voltages, frequencies and stuff, and even a memory for trace capture. Cost more, but get more functionality - may be worth seeing what is out there 2nd hand too.

    • Like 2
  4. I know this is a bit of a tough question considering there isn't a lot of these out there, but does anyone know/can point me to where to find the most current ROM for this machine is? When I try searching I find a mess of "romz" sites, and the ones I can find on say vpinforums don't match mine.

    From my poor research I found a lot of the roms in different sites seem to be:

    CPU V1.8

    VOICE V1.2

    SOUND V2.1

     

    My machine has:

    CPU V1.6

    VOICE V1.2 (same)

    SOUND V2.4

     

    While I am not in a rush to update or change my machine, I haven't seen these other rom versions anywhere - so should I image them from a "preservation/documentation" perspective? If so, where should I upload them to once done?

    Cheers

  5. @wolfy I just remembered: do you have the flasher pcb in your machine? For some reason it seems to be missing from some machines - probably scavenged for other AG machines as they all seem to use it. Labelled PCA-007. If yours is missing I am pretty sure I have the files somewhere to knock one up as I made one a few years ago for someone who was missing one...

    • Like 1
  6. @wolfy

     

    Ah, right. I just looked at the manual but it is for the 001 mpu board, and they sure moved a lot around in the revision.

     

    Based on my game, you are missing (from left to right in your pic):

    1. 65C22 VIA

    2. Populated already (should be a 8255)

    3. 65C02 Processor

    4. 27C512 game eprom

    5. 6264 RAM

    6. Populated already (should be 8255)

    7. Populated already (should be 8255)

    8. 65C22 VIA

     

    Those boards look really nice. Let me know if you want to offload one of them - I can replace the corroded one have 😄

     

    Pics of the manual (that aren't too useful as it refers to the earlier MPU):

     

    1916133653_2022-01-2420_18_39.thumb.jpg.eb8d638cf6479dfd34c0c37053a1e6b7.jpg

    oof this pic is blown out, sorry. Additionally, the parts list and the board designations don't match up at all. Weird manual.

    181764159_2022-01-2420_18_45.thumb.jpg.cabb3630061137c2eccd9384aaba9bb7.jpg

  7. 7 minutes ago, Boots said:

    That’s actually what made me notice it

    Sorry I’m a bit of a Nazi with batteries, I’ve had to fix too many boards with corrosion. 

    nah, no aplogies needed. I am currently dealing with 3 MPU boards that are battery damaged and not currently working 😕

    Only 1 was my fault (or duracells if we really want to get picky) - the rest were as bought... honest

     

     

    Below is the trace damage I found beneath the coin cell holder:

    1474961875_2022-01-2412_06_07.thumb.jpg.63a4aaab07fe9d2958f8a8715d21ebcc.jpg

    • Like 1
  8. a stab in the dark here, but could it be accessing the site via a desktop, pad and phone or some combo of multiple devices causing the login requests? I only use my desktop and it has never asked for a login after the first round. Not a solution saying "use only desktop" - but it may give another avenue to search for the issue? 🤔

  9. 4 minutes ago, Boots said:

    @AskJacobWhy is the the coin cell battery removed and a remote AA battery pack fitted?

    the original coin cell holder was green with corrosion. While coin cells are much less likely to leak, when I got the machine there was no battery installed, and the cell holder was in poor shape.

    I have replacement coin cell holders, but it just never seemed to be a priority... the aa "pack" was originally a temp thing.

    I also note that the "pack" is duracells. Something to be taken care of while i have it open for service....

  10. I'll get it open and double check for you in the next day or so. Did yours come with the upper marquee? Mine came with the "box on stilts" but no marquee plastics. I was generously given an AG Football (different region vsion of the same pin) marquee so I could do a full scale scan and re-jig the text to make a replacement. My replacement prints are stuck in courier hell right now - but when they finally come in I can check how they look.

    Happy to help out with any info you need. I also think I have the artwork tucked away for spinners, striker plastics and some other bits I made a while ago now.

    All the best with the rebuild. Not too many kicking about so well worth the effort I reckon.

  11. 10 minutes ago, Boots said:

    thats the one. Amazing price too

    1 hour ago, wolfy said:

    Long shot, but I'm looking for an Alvin G CPU board, to suit an A G Soccer Ball.

    I believe any of the AG cpu boards are interchangeable (but I could be wrong!).

    I thought I'd try local before exploring sourcing from USA. Postage is exorbitant.

    Any members here who have one of these machines with some knowledge of them who might be willing to answer a few questions at some stage?

    thanks

    Wolfy 

    @wolfyI own and AG soccer-ball... what did you want to know?

  12. So lets step away from the mechanicals and get to the electronicals:

     

    Nice find in the head box... the black death has visited the LDA100 lamp driver board. A previous repair of a burnt scr has been done competently which is nice.

     

    The worst section:

    203468233_2022-01-1518_34_54.thumb.jpg.f78126f3b018b3284850a80b5d852523.jpg

     

    So now to use the air-eraser-blaster to get a look under the green screen to assess the real damage:

     

    798012086_2022-01-1521_21_12.thumb.jpg.08f4060ca5fc5d5a92c075ed810b3470.jpg

     

    you can see some traces are completely broken. I will re-work those. Others that are still intact will be cleaned then overcoated with some UV curing pcb ink. The colour isn't a great match, but it will seal the traces, and looks (to me) a lot better than solder smeared all over the tracks. This photo looks a lot worse than it is in person. I think the uv coat is better at encapsulating the tracks, and looks a lot better than the old nail polish trick...

     

    395592737_2022-01-1521_42_20.thumb.jpg.edce8292ac43e5610f86290e913ec7ab.jpg

     

    Let's just call this a training exercise for the MPU board. I have 2 but both have ancient battery damage 🙄

    • Like 3
  13. One thing I can say - if you forget to turn the feature off it certainly scares the crap out of you when testing/servicing/cleaning. So many times it just fires up, blares music and tries launching balls... even with the playfield up and no balls in the machine, They didn't bother with service interlocck on the AG. Nothing like a solenoid firing next to your head while trying to read a multimeter 😆

    • Like 2
    • Haha 1
  14. AG Soccer-Ball has a self play demo mode. Because it has integrated switches on the flippers, it can self-play for a short time to demonstrate the head to head play. The switches on the flippers are used for player vs CPU singe player, or determining who is scoring in 2 player (you get all points gained from when your flipper last touches the ball). 

     

    I think a major reason this sort of thing isn't popular is due to increased wear on machines - machines getting used while no "coin in play"

  15. it is a shaded pole ac motor there, so reversing the wires wont make it go backwards as you found out. Someone hacked in that motor/gearbox as you say, it is not original... the original is a "can" type motor, not an open frame. Sort of ingenious hacking there, but they got caught out by the rotation of the motor, hence the "twist" fix

    • Like 1
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