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Speed Race Fans IC intentifier chart and repair log

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Share any logs or helpful information you may have to repairs of arcade PCBs, Monitors etc

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  • #16
    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.

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

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

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


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


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      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.

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      • #18
        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....

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        Some progress. Few more tll replaced. It's good to be able to see actual cars moving about. [MENTION=12190]wiredoug[/MENTION] 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; 12 March 2019, 01:28 PM.

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        • #19
          [MENTION=12190]wiredoug[/MENTION] does that schematic have the credit board, timer and score board also? Hoping you're in a good mood so you scan and upload.

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          • #20
            yep but im not in a good mood

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            • #21
              Oh that's cool to know, that it has the other pcbs, not that your not in a good mood. lol

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              • #22
                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
                All correct! Mine are clearly labelled
                Always remember you are unique; Just like everyone else.

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                • #23
                  Thanks mate! That's massive, good to know I'm playing the right pitch.
                  Now I just got to work out what's wrong with it!

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                  • #24
                    Originally posted by taito View Post
                    Thanks mate! That's massive, good to know I'm playing the right pitch.
                    Now I just got to work out what's wrong with it!
                    No worries! By the way your inbox was full. Can you remind me which of those pcbs you wanted? Theyre in my car now ready to take to work and post
                    Always remember you are unique; Just like everyone else.

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                    • #25
                      [MENTION=3619]phreak97[/MENTION] Oh thank for letting me know.

                      The two deluxe score...

                      The speed race score pcb

                      And the optical pcb

                      So 4 in total. thanks.

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