Anyone seen a set of these online anywhere? I've been using google to see what I can find but haven't had any luck yet.
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Pin 4 of the YM3014 is the serial data input (digital signal), pin 2 is the analog converted signal which usually goes to the OP-AMP.If you are using a logic probe you cannot check analog signals, best would be to use a scope or , even better, an audio probe to "listen" to the signal.
After identifying the DAC as being bad and replacing it, I still didn't have any sound. My workmate was looking at the datasheet for the op amp 4556 next to the DAC. He asks me if the -5 is there for the op amp....well it wasn't as my test set up does not have -5 on the power supply. When I bought it it was advertised as having it, and it labelled as such but doesn't exist.
I also haven't had a game thus far that used it so my answer was "no". so I snatched the sheet away from him as he walked away laughing...
I then took my meter and checked for continuity back to -5v pin on the jamma connector from pin 4 and sure enough the op amp is looking for this voltage.
I grabbed a separate power supply off the bench and connected it up and the sound works. (ground was isolated on this power supply, this is important!)
So...after many frustrating hours of pissing around even after finding a problem on the board, you will need -5v to run the 4556 op amp next to the DAC.
Volfied is back up and running as expected!
Thank you for your help ladies and gents, appreciate your time!