Teenage Mutant Hero Turtles repair log #5 and Konami ‘007340’ reproduction by Caius

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    • Teenage Mutant Hero Turtles repair log #5 and Konami ‘007340’ reproduction by Caius

      THIS IS A REPRODUCTION PROJECT MADE BY @caius ALL INFORMATION HAS BEEN POSTED WITH HIS PERMISION. CREDIT AND MERIT GOES TO HIM.

      Got in a trade this untested Teenage Mutant Hero Turtles PCB:



      At first test the board turned out to be faulty.Sprites were scrambled and some sound samples scratchy:





      I launched a MASK ROM test which reported as bad all four 4Mbit devices storing sprites data:



      Obviously the result didn’t mean the MASK ROMs were all bad, this was quite unlikely but for fure there was a problem in the sprites generation circuit.
      Most of the circuit is condensed in two ASICs, the ‘051960’ which generates the address for the MASK ROMs and the ‘051937’ which reads their data:



      Judging from type of fault, the ‘051960’ was generating wrong address, you can see its implementations in this snippet of schematics :



      Also scope analyzing confirmed my suspicions :



      This lead me to remove and replace the ASIC:



      This restored sprites so the IC was really bad (it’s not the first time, see my past repair log of Block Hole)



      Now the sound issue.A quick visual inspection relevealed that one of the two components marked ‘007340’ was cracked in two:



      As schematics suggest the ‘007340’ is a resistor ladder (R2R) used to convert into analog the digital bits outputted from the ‘007232’ PCM controller:



      Schematics show internal layout and resistors values so I made a very rough replacement that worked fine:



      Later I properly reproduced it :



      Another PCB fixed and another (little) custom reproduced.

      * Arcade-projects, the site where you get the most of your arcade games.
      * If you want Drama go to Neo-Geo forum ---Darksoft
    • scratchy sound is a very common issue on these, and a problem that no one seems to have found a good solution for. I wonder if a lot of people have internally cracked resistor ladders that they simply haven't realized.

      I also find it interesting how common those ladders are on PCBs I find but no one seems to make replacements.
      Buy My 3D Printed Parts: bit-district.com
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      My PCB list: VAPS
      My Cabs: VOOT | RFM | Vewlix F| FiF Jr. | KI2 | UMK3 | E29 | E29| Net City | DDR
    • twistedsymphony wrote:

      scratchy sound is a very common issue on these, and a problem that no one seems to have found a good solution for. I wonder if a lot of people have internally cracked resistor ladders that they simply haven't realized.
      If music is scratchy then this has noting to do with these resistors ladders since the they are for the "007232' PCM controller.If sound samples are affected, most likely they are involved

      twistedsymphony wrote:

      I also find it interesting how common those ladders are on PCBs I find but no one seems to make replacements.
      Me! :)
    • I was referring to major electronics manufacturer, but it's nice that someone like yourself does provide an option.
      Buy My 3D Printed Parts: bit-district.com
      Follow my projects: instagram | blog
      My PCB list: VAPS
      My Cabs: VOOT | RFM | Vewlix F| FiF Jr. | KI2 | UMK3 | E29 | E29| Net City | DDR
    • caius wrote:

      If music is scratchy then this has noting to do with these resistors ladders since the they are for the "007232' PCM controller.If sound samples are affected, most likely they are involved
      @ekorz was it you who was telling me his TMNT had scratchy sound?
      Buy My 3D Printed Parts: bit-district.com
      Follow my projects: instagram | blog
      My PCB list: VAPS
      My Cabs: VOOT | RFM | Vewlix F| FiF Jr. | KI2 | UMK3 | E29 | E29| Net City | DDR
    • twistedsymphony wrote:

      @ekorz was it you who was telling me his TMNT had scratchy sound?
      Yep, my TMNT2 conversion has scratches/pops on all of the audio samples. So the opening themesong, the turtle's speech samples, etc. @cpsystem3 thinks it's the audio custom (054539) but we haven't gotten to replacing it yet. Got my donor board though! I could see if any resistor ladders are in line but he had the same symptom on a Vendetta board and solved it with the custom swap.

      jammarcade.net/vendetta-bad-audio-samples/


      @caius excellent log btw! I love this stuff!
      have multi: cps* ttx2 st-v gnet f3 mvs sega c2 sys2x6 naomi(netboot)
      want multi: pgm sys16/18/32 m72/92 atomiswave seattle supernova jms32 naomi(cart) namco na-1/2 namco sys10/11/12
      cabs: blast city x2, vewlix c
      klov games list | custom fight sticks
      current project(s): gamecube stuff
    • ekorz wrote:

      Yep, my TMNT2 conversion has scratches/pops on all of the audio samples. So the opening themesong, the turtle's speech samples, etc. @cpsystem3 thinks it's the audio custom (054539) but we haven't gotten to replacing it yet. Got my donor board though! I could see if any resistor ladders are in line but he had the same symptom on a Vendetta board and solved it with the custom swap.
      TMNT2 has different sound hardware, there is no '007232' PCM controller hence no resistor ladders.TMNT2 has the '053260' PCM chip which is quite unreliable, see this repair log from mine besides the Vendetta one:

      jammarcade.net/sunset-riders-repair-log-6/

      So, I really think scratchy sound is due it.

      ekorz wrote:

      @caius excellent log btw! I love this stuff!
      Thanks.