RetroInjection
Well-known member
How can I get rid of these? Is the voltage too high, and is so, how do I change it? Thanks.
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The power to the board runs through a few pins at the end of the jamma connector, if any of those don't make good contact or have corrosion or any kind of resistance it can lower the power that makes it through, if you get down below 4.5 or so the board may not do anything. I know you said it's a new universal harness but if the wires are thinner for instance, they won't allow as much amperage through and would lower the voltage too.
When you check the power too, you need to check it on the board, not on the power supply. If it's much lower on the board than at the power supply, you've got resistance somewhere or the wires are too thin.
NBA Jam is well known as being a power hungry board, it takes a lot of juice.
If you knocked the crystal off the sound board of course it's definitely not working so who knows what's going on.
You were right. It was the voltage to the PCB. Cranked it up, heard the BONG and now we are playing. Thanks for the great advice.
Any tips for how to solder the Y1 3.58 MHz crystal back to the sound board? Finding it really difficult.