I have a stargate machine that has a power supply that has 15.6v on the J1 plug. If I plug it into the socket it will blow the fuse. Before the trouble shooting started I was not getting sound or display. I know of the 5v adjustment but what do I do about being over 12v
*Unregulated* 12V so the 15.6V is fine.
An LM338 regulator on that power supply can handle voltages of 15.6V just fine (up to approx 35VDC). If plug is pulled from J2 and fuse blows then you have a regulator problem. Test and adjust things with J2 removed - accidently putting 12V (or 15.6V) down your 5V line will cause lots of mean and nasty things to happen.
I like to hang a 1 amp load on 5V supplies during testing & adjusting. A 5 ohm resistor between 5V and ground will work fine. But make it a BIG cement resistor as it will be dissipating a constant 5 watts and will get hotter than hell.
With j1 plugged in and j2 unplugged I have 5v on pins 1-8. So can I move past the power supply? In the very beginning I only didn't have sound, it went into a attract mode and I had display. I adjusted the voltage up to about 5.3 V and was able to get sound and display in attract mode. I thought I fixed it so I shut the power off to put the cabinet back together. Once I turned it back on I had solid lights on the boards. I dialed back the voltage and was able to get a flashing light on the CB to go into attract mode but lost display. At that point I unhooked the soundboards and rebooted to see if I can get the display working without the soundboards causing a problem. That's when I started blowing the fuse to the power supply.
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Fullerton, CA