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Mortal Kombat 1 Jamma board
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Arm123:
Hey all.
I bought a MK1 board for $9 dollars. It was advertised as NON working / glitchy. After a few shorted pins were fixed and bad solder joints redone, it works great.
Only one problem. I am having some issues with the sound board.
I only had the ribbon cable, no other wiring. After making my own wiring harness for the sound / power connections from JP2 on the cpu board, I still didn’t receive any sound.
I found out shortly after that it was just inaudible sound and that i needed a volume pot for the sound board.
After hooking that up i did indeed get sound. Trouble is... I only get SOME sounds. It seems as if all the vocal sounds are missing. I only receive music, tones and some selection menu effects.
Iv been threw the diagnostic tests and everything checks out (ROM checks / one tone). Also, the sound effects testing, i only hear music effect that play, no vocals.
Any of this sound familiar ? Any suggestions are appreciated ?
Thanks
Arm123:
Ok... I 'think' i found the problem.
It looks as if someone removed IC U32 off of the sound board. Its a tl084, and i guess i need to find a replacment.
Arm123:
I replaced that that TTL and ALL sound works fine now. Hope this helps someone... But then again, i dont know who the hell would remove a chip off a perfectly good board.
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