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Thread: TMNT Repair Log

  1. #1
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    TMNT Repair Log

    I had a TMNT PCB on the bench tonight, the video below shows the graphics fault.



    I did a quick once over of the board before looking up the schematics and when I got to the Mask ROM at K27, I found pin 14 had no output.
    After checking the schematics there should definitely have been and output there.

    The mask ROM has been removed and socketed but none of my burners can read/program them (27C400 equivalent), is there anyone that can help me out and possibly burn a new for me?
    @poidapoida
    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

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    If you can burn a 27C4096, and your programmer can turn off its chip-id check, then you can use one of the 27C4096 to 27C400 adapters out there. They'll normally also work with the 27C800, 27C160 and probably the 27C322 chips as well. You do need to split your roms into 512KB chunks and switch banks to program each, but any hex editor can do the splitting.

    https://oshpark.com/profiles/thepoorstudenthobbyist

    That page has a few variants, though one of the 27C322 versions is advised. The SMT one has the component values marked, but they're the same values for the through-hole version. The thing in the bottom right is a 2PDT switch with 2.54mm pin spacing.

    I could program for you if no one else puts their hand up, but i'd have to check if i have any 27C400's left.

    related: Can someone with Eagle convert the below file to a gerber?
    27C4096_to_27C400_adapter.zip
    Last edited by buttersoft; 21st June 2019 at 09:50 AM.

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    I can help if you like

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    Awesome mate, thank you.
    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

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    K27 Mask ROM was replaced and some improvement but still had graphics issues.
    Found the dip settings for testing the Mask ROMs and it indicated H4 and H6 were faulty.



    5 x 27C400 ROMs were ordered and with the help of @Arcade King they were programmed.
    I replaced K6 first an the graphics fault was gone.
    All of the Mask ROMs were removed, socketed and replaced.
    When testing previously the voice sounds seemed a little scratchy. After soak testing for a while the voice sounds disappeared and the music and sound effects would drop in and out.
    This was traced back to a dodgy tantalum cap in the audio circuit and once replaced all sounds were restored and clear.


    I was given an adapter board that converted a 27C4096 chip to the equivalent pinout of the 27C400, the board was modified in reverse so I could drop a 27C400 into the socket and plug the board into my TL866 in order to read/program ROMs for TMNT boards.
    I drew it up on EasEDA last night, a pull up has been added to the Vpp line and a cap across the power rails.



    Link to Gerber: https://drive.google.com/open?id=11h...WaYJl9MqkHeyD5
    Link to Schematic: https://drive.google.com/open?id=1DI...cLlHM2fk3cTiMA
    Last edited by Kaizen; 6th July 2019 at 01:13 AM.
    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

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    Awesome work mate.

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    Thanks alot @Kaizen and to @arcadeking for helping out1562477557183.jpeg

    Sent from my SM-G925I using Aussie Arcade mobile app
    Last edited by poidapoida; 7th July 2019 at 04:49 PM.

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    Quote Originally Posted by Kaizen View Post
    I was given an adapter board that converted a 27C4096 chip to the equivalent pinout of the 27C400, the board was modified in reverse so I could drop a 27C400 into the socket and plug the board into my TL866 in order to read/program ROMs for TMNT boards.
    Is that different to the ones i linked to? I've been using those to read and write 27C400 chips... and the 800/160/322 chips too, with the programmer set to work with a 27C4096.

    Not that i'm not enjoying the repair log by itself, of course

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    The board will only do the the 512k 27C400.
    For the larger eproms you'll need the board with the dip switches or jumpers to program them.
    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

  10. #10
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    Quote Originally Posted by Kaizen View Post
    The board will only do the the 512k 27C400.
    For the larger eproms you'll need the board with the dip switches or jumpers to program them.
    That part i understand, it was more a question about any functional differences for programming, and why you made a 27C400 adapter yourself when you'd need another one to do the other chips.

    Then again, i spent almost as much designing and making my PC Engine hucard repros as a turbo everdrive would have cost, and they don't work nearly as well and look totally backyard, so i really shouldn't be hassling you for looking to do your own designs and programming because i understand the urge

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