Arcade Collecting > Miscellaneous Arcade Talk
Missle Command Circut Board
Wade:
The volts on the AR board were about right, maybe even a hair high. Seems the 5V was around 5.05 or 5.1 on the ARII, and on the CPU board itself I think it was around 4.85. I will have to check these again and write them down, but they seemed "close enough" to me. It occurred to me to turn up the volts just slightly, BUT I saw one blue pot but didn't know for certain that was what it was for. Didn't want to take a chance. :)
I did check out the edge connector. It seems to be tight and pretty clean, but I went over it with some super fine sand paper anyway, just in case. That top pin WAS burn off, but someone had already cut around the harness and made the connection with a standard quick disconnect (my T&F cocktail has the same hack!)
Since all the voltage points on the CPU checked out close to where they should be, I figured the connector and ARII board are probably working "most of the way". These might show up as intermittent problems later, but for now I'd be happy to get a screen to come up.
I will pull the board out all the way and check it out in more detail, looking for some of those broken legs you talk about.
I am probably going to go ahead and order the RAM, the ARII kit (after I figure out which version I have), and some other random parts from Bob Roberts in the next couple of days.
That'd be nifty if I could get this game working by swapping that RAM chip, or fixing something else. :) I just really don't want to spend $85 on a board repair, when I know I'm going to have to spend $70 on sideart and $40 for a CP overlay, plus all the other misc parts to make it nice.
Wade
Rocky:
You should adjust the Power supply so you get 5.1vdc on the board. Under 5v is not good.
RayB:
Yup Wade, what Rocky said. Why would you order a bunch of parts when your board isn't getting 5v? Like I said, mine reads 5.4. You could replace all the RAM and STILL get errors if they aren't powered correctly.
Try this test: Power on in self-test mode and leave if for a couple minutes, just to see if "warming up" fixes anything. If not, do this next step:
Turn the power off. Adjust the blue pot just a TOUCH clockwise. If you're worried about moving it too much, you can always turn it all the way down (counter clockwise) power on, measure +5 voltage AT THE GAME BOARD. Then turn power OFF. Turn the pot just a tiny bit. Power game on again. Measure +5 again. Keep doing this until you get 5.1 or 5.2.
Once you hit around 5.0 do the self-tests again. Repeat until you are self-testing at 5.2, 5.3 and like I said, mine reads 5.4. Chances are your ram errors may disappear by then.
Wade:
Hey guys!
I got a few minutes to mess with it. I upped the voltage gradually up to 5.2 but still no dice. BTW, on my ARII, the blue R8 knob goes counter clockwise to increase the voltage.
I can't wait until I finish up a couple other things I've already started, so I can officially start working on this and the Moon Patrol (which works 100%, but needs repainted and some other new parts). Once this one works, I can justify buying some new parts for it to make it nice. This MC will be much easier since sideart is made for it. Wish it were already done and in my gameroom... :)
Wade
RayB:
COUNTERCLOCKWISE!?
AAACK!
crappers. That means I have mine turned all the way up.
I told ya I was no expert! HAhahah ;D
I'm gonna go turn it down now. Sheeeee-it!
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