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Thread: Speed Race Fans IC intentifier chart and repair log

  1. #11
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    Funny! A space Invader plug should work right!?

    Won't know till someone else chimes in. Be nice to think it's just one chip that's causing the issue... but I doubt it. Cheers!

    Quote Originally Posted by wiredoug View Post
    nah thats just cos you're drunk and hooked it backwards

    it might be 107 ? im not saying its wrong i just dont know

  2. #12
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    Quote Originally Posted by taito View Post
    Oh cheers!

    could you please confirm the following when you get a moment, these were hard to read or were in sockets.

    IC88. 107
    IC80. 10
    IC36,IC49,IC50. 93
    IC51, IC52, IC64. 10

    Cheers
    Can do!
    Always remember you are unique; Just like everyone else.

  3. #13
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    Quote Originally Posted by wiredoug View Post
    i sold the one i had but the close up pics crackerjack took are on here somewhere with all the chips

    since then i came across a full 1977 faxed copy (20 odd pages) of the proper schematic sent from japan to an oper we bought out. one day when im in a good mode ill scan it. hopefully before it all fades away like parts of it already have

    its not online .. its probably the only copy left. but its out there still
    Is that schematic of the Taito or Fuji board?
    Namco Starblade - Taito Cocktail 14" x 3, 20" x 2 - NZ SI PtII Upright - Chase HQ DX, Taito Top Speed - Taito Grand Champion - Taito Safari - LAI SI Head to Head Cocktail - SI Cocktail Clone x 2, Pong Clone x 3

  4. #14
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    Quote Originally Posted by Kaizen View Post
    Is that schematic of the Taito or Fuji board?
    its labelled pearl .. id say fuji but same same

  5. #15
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    Quote Originally Posted by wiredoug View Post
    its labelled pearl .. id say fuji but same same
    The schematics are almost the same anyway
    Always remember you are unique; Just like everyone else.

  6. #16
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    So I had the PCB up for sale but no takers, so I decided to fix it instead...

    All but one of the chips in the column have been replaced, plus I replace all but one of the 555's. And I got something on screen.

    I'm missing that 74279 quad s-r latch so that's holding the process back, but feel I'm not far off now.

    Quite a few of the chip legs broke when I removed them, so all new IC's in there now.

    line.jpg

    Found a 02 that was not outputting. It had to go, then I got this!

    lines.jpg

    Soon after I got an oscillating movement up and down the screen. The beginning of cars. Squares at best.

    cars.jpg

  7. #17
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    So here's some more of the work I did.


    20190310_164245.jpg


    20190310_155248.jpg


    Removed the chips from the row with a white powered film.


    ebay3.jpg


    Will do some more work on this soon. In fact it's quite a relief from the the other games I've been working on.

    No CPU, or RAM to worry about. Just TTL and discreet components.

  8. #18
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    I'd been turning the pcb over frequently and I bumped the xtal. It was already wiggly and it snapped off!! Crikey!! That put an end to repairs. I looked around for a 14.13 but didn't have any so I popped in a spare 14.4 but that didn't work. I had an Atari Gran Trak 10, and it had the right xtal, so I used that. Then I was greeted with this....

    20190311_182940.jpg
    Some progress. Few more tll replaced. It's good to be able to see actual cars moving about. @wiredoug we can be quite sure 88 is a 107. Just got to get the 279 now.

    Update: I found 3 more misbehaving IC, all 7410's. Replaced them with new, but I kind of think this repair is going to be difficult without the cab to put it in. I spent ages looking for an output line only to discover it went to the credit board. How the credits are handled is a mystery without the credit board to examine so I may have to leave it there.
    Last edited by taito; 12th March 2019 at 01:28 PM.

  9. #19
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    @wiredoug does that schematic have the credit board, timer and score board also? Hoping you're in a good mood so you scan and upload.

  10. #20
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    yep but im not in a good mood

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