Space Duel +5

Robotron Jon

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I am having to run my Space Duel at over +6...what on the PCB is a problem if you have to run it at this voltage? The AVG? What would cause this issue? I recently rebuilt the ARII.
 
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My guess is that you are losing voltage somewhere (edge connector). Check the voltages at a chip and I bet you'll find they're closer to 5VDC than 6VDC which is what you may be putting out at the PS...
 
Running it at over 6vdc will ruin your motherboard. Why are you running it that high.

I shut it off after determining what it was running at...and it wasn't on very long, maybe 5 minutes or less. I just rebuilt the monitor so I hadn't been using it.

I have two Space Duels so I put in the PCB from the other one and the same thing is happening so my power supply seems like it could be the culprit

I have a second power supply in my other Space Duel so I will put that in and see what happens. I must have screwed something up when I rebuilt the first power supply or else it's something in the power brick.
 
My guess is that you are losing voltage somewhere (edge connector). Check the voltages at a chip and I bet you'll find they're closer to 5VDC than 6VDC which is what you may be putting out at the PS...

+6 is the measurement at the board. The power output from the PS is also not constant, it goes up after it has been set. Maybe it's the power supply adjustment pot. I didn't replace it in the rebuild. I guess I will have to put in that second power supply and see what happens. If it works okay with PCB 1 and PCB 2 then it's probably something in the first power supply that is bad.

We'll see.
 
So if you drop the voltage to 5 volts. It doesn't work?
Is that what I am hearing?
or the only way to get your game to work is to crank it up to 6 Volts?

Maybe you got a Fuggly pot and when you tweeked it you broken it? If you plugged in something wrong you should not be any voltages at all.
 
I put in the other power supply and I still have the same problem. The voltage is set at 5.2 and then just keeps going up uncontrollably. Could this be something in the power brick?
 
Would bad contact of the edge connector cause this? The AR sense signal thinks the voltage is low and cranks it up. I'd start by repinning/replacing the wiring harness edge connector. Always a good thing to do on a vector game anyway.
 
Would bad contact of the edge connector cause this? The AR sense signal thinks the voltage is low and cranks it up. I'd start by repinning/replacing the wiring harness edge connector. Always a good thing to do on a vector game anyway.

That's a good point, it was also mentioned before by two other posters - I will look into it. I think the sensor would be located at Y 21 on the edge connector.
 
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Fixed this today.

The ground wire for the +5 sense signal was gone from the wiring harness. I guess when there is no ground for the sense signal it cannot work properly and just keeps upping the volts to the main board.

I hooked up a new ground wire to the harness for the sense signal and now it works perfectly with rock solid +5.

Very happy to have this game working nicely...

Thanks for the help
 
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