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  1. Thread: Nba jam te pcb

    by Womble
    Replies
    11
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    160

    You can't swap the RAM chips with IC pullers,...

    You can't swap the RAM chips with IC pullers, they are surface mount chips, pullers only work if the chips are socketed.

    Pulling on those will rip dozens of tracks and pads off the board and...
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    183

    Pretty sure they are just standard 6264 type...

    Pretty sure they are just standard 6264 type SRAMs.
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    Sorry, have cleared some space now.

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    626

    It doesn't look like those caps were ever there,...

    It doesn't look like those caps were ever there, not unusual for a bootleg board to trim parts to save cost. Looks like the flow solder just filled the empty holes, no sign of any leg stumps.

    I'd...
  5. Thread: New Cab Day!!

    by Womble
    Replies
    11
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    383

    You are :) Only one of those was mine, the...

    You are :)

    Only one of those was mine, the other was Radirgyman's heading out.
  6. Thread: New Cab Day!!

    by Womble
    Replies
    11
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    383

    New Cab Day!!

    New cab day is always a great day, especially when one of these lands on the driveway!

    Kudos to radirgyman for finding another one of these less than 15km from my house. I thought one was a...
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    Epic!!

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    92

    Mini Q*Bert Machines

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    477

    Not very I'm afraid, the quad flat pack ICs have...

    Not very I'm afraid, the quad flat pack ICs have galloping pin rot too, and while individual chips can be replaced the issue will be the PCB itself. If the ICs are that badly rusted then there will...
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    Pic 2 (Konami) is probably Sunset Riders.

    Pic 2 (Konami) is probably Sunset Riders.
  11. Thread: Power Supply

    by Womble
    Replies
    10
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    370

    +1 for Meanwell. The main benefit of an ATX...

    +1 for Meanwell.

    The main benefit of an ATX PSU is that the 5V output is regulated so your 5V will stay at 5V for whatever board you connect, whereas an arcade PSU will need adjustment as you...
  12. Thread: Jamma pcb fix

    by Womble
    Replies
    3
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    199

    A board fault of some description, RAM, ROM,...

    A board fault of some description, RAM, ROM, associated logic, track-rot, or physical damage in the gfx subsystems. Not that that narrows it down much, if those patterns are moving around then it is...
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    For ref the Jomac site is very useful when it...

    For ref the Jomac site is very useful when it comes to IDing these..

    http://www.jomac.net.au/services/monitors/
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    Depends which parts you need, but Tamiya...

    Depends which parts you need, but Tamiya re-released some of their 1980s models over the last 3-4 years, the electronics would be different to the 1980s but I bet the actual car itself is...
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    1,147

    I'd hack the connector loooong before I would...

    I'd hack the connector loooong before I would hack the board, its survived 30 years in minty condition, would be a real shame to hack it to fit a $1 yum cha-chinese connector.
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    This really digs into it... ...

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    Yeh, it looks like this cabinet is wired as old...

    Yeh, it looks like this cabinet is wired as old school LAI, with the extra buttons for the kick harness, and the main wiring goes into an LAI to JAMMA adaptor harness to convert to the board.

    As...
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    1,147

    Hmm, I'm leaning towards it being a bootleg, it...

    Hmm, I'm leaning towards it being a bootleg, it certainly isn't a CPS1 board that you'd expect for a SFII CE. I suspect those Capcom stickers may be home-made, or done by an Op at some stage to make...
  19. Thread: Konami Board ID

    by Womble
    Replies
    9
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    282

    Yep - Sunset Riders

    Yep - Sunset Riders
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    135

    Bad RAM or a fault in the logic that controls the...

    Bad RAM or a fault in the logic that controls the RAM or the ROMs that deal with the background plane would be my bet.
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    As a blind guess I would say the socket has...

    As a blind guess I would say the socket has failed, these boards have old single wipe sockets and the metal contacts are now very fragile. Fitting the kit may well have stressed or bent the contacts...
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    TMNT is mono only, some later Konami games...

    TMNT is mono only, some later Konami games (including TMNT 2) had the option for Stereo.
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    279

    Its because the 12v is not regulated on arcade...

    Its because the 12v is not regulated on arcade PSUs, it is proportional to the 5V, as in when you crank the 5v the 12v will rise too, but the actual voltage you can measure at the board be dependent...
  24. Thread: Hyper sports

    by Womble
    Replies
    7
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    299

    The drop is related to losses in the wiring...

    The drop is related to losses in the wiring (wires too thin) and resistance at the contacts. Often this is due to using a modern eBay harnesss with an old board (they have hair thin power wires and...
  25. Thread: Hyper sports

    by Womble
    Replies
    7
    Views
    299

    The daughterboards are usually stuffed into IC...

    The daughterboards are usually stuffed into IC sockets, and can be very tightly stuck due to the number of pins involved. I'd check that they haven't been soldered in though.

    Hard to tell with...
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