| Arcade Collecting > Restorations & repair |
| Repairing Tatio Double Dragon Audio Issue |
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| finalfan7asy:
Hi, I’m currently restoring/updating my Tatio Double Dragon arcade machine and ran into an issue that I’m not familiar with. The cabinet has one 5W 8ohm speaker which recently is playing distorted game music. However, the sound effects such as punches or character voice noises sound perfect over the music. Does this sound like a speaker or circuit board issue? I’ve tried unplugging and cleaning the main board wire harness with no luck. Any help would be much appreciated. |
| lilshawn:
generally lopsided sound (some sounds fine, others garbled) is a corrupted ROM issue. pull and check against rom dump and/or erase bad rom and reprogram. |
| Mike A:
lilshawn is right. It sounds like a ROM issue and there could be a corrupted ROM. You might get lucky first by finding the sound ROMs and pulling them out, cleaning the legs and reseating them. I had a similar problem on a game and the ROM tested bad. It ended up being a broken trace on the PCB. |
| finalfan7asy:
Thanks for the responses. Would you know which chip in the photo controls the sound? Also, is this a “bootleg” board or an original? I’ve owned my cabinet for over 10 years and never inquired if it’s authentic. |
| PL1:
--- Quote from: finalfan7asy on June 15, 2021, 04:36:45 am ---Would you know which chip in the photo controls the sound? Also, is this a “bootleg” board or an original? --- End quote --- It appears to be a bootleg like this one not the original shown here. - The original PCBs are marked with P/Ns "TA-0021-P1-4" and "TA-0021-P2-4" which isn't on your board. - Next to the label on yours, there's a "4068A-2N" silkscreened on the board that isn't on the original boards. - The round numeric ROM labels on yours are like the ones on the bootleg, not the square alphanumeric ones on the originals. Based on your ROM labels and the MAME ddragon.cpp source code here, it looks like you have a "ddragonba" board. (lines 1488-1492 ==> adpcm sound ROMs are "7" and "8") Scott |
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