mikejmoffitt
Mickey's Coach
- Joined
- Feb 6, 2014
- Posts
- 578
This MVS has a torched 12V line, so I don't plan on restoring audio to the JAMMA edge. Rather, I am trying to pull stereo sound from it. I've done the 5V modification as outlined on the Jamma Nation X tutorial. However, I hear no audio except for some buzz and very faint PSG audio.
I checked that the YM3016 (the DAC) and the op-amp are both getting 5V in the right spots. Tapping from the mixing resistors towards the bottom of the PCB gets nothing but the PSG again.
If I tap the YM3016's BUF, MP, or BC pins (13, 14, and 15) I can hear the YM2610 audio, though it is distorted. I can also hear the static serial data if I probe it, so the YM2610 is fine and communicating properly.
However, on the YM3016's pins 10 and 11 (analogue output) I hear absolutely nothing. Is the signal out of it weak and I should not expect to hear anything, or is this a sign of a dead YM3016?
I checked that the YM3016 (the DAC) and the op-amp are both getting 5V in the right spots. Tapping from the mixing resistors towards the bottom of the PCB gets nothing but the PSG again.
If I tap the YM3016's BUF, MP, or BC pins (13, 14, and 15) I can hear the YM2610 audio, though it is distorted. I can also hear the static serial data if I probe it, so the YM2610 is fine and communicating properly.
However, on the YM3016's pins 10 and 11 (analogue output) I hear absolutely nothing. Is the signal out of it weak and I should not expect to hear anything, or is this a sign of a dead YM3016?