Arcade Collecting > Miscellaneous Arcade Talk

Missle Command Circut Board

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Wade:
I will open it up and look at the connector in the next couple of days, maybe tonight.

Do you know of any info on the ARII board, on the net?  I can't even test it if I don't know what to look for.  Unless of course, everything is labelled clearly and I just haven't opened it up yet to find out. :)

I might order the kit from Bob for insurance, however I am assuming this will not fix my problem.

Thanks,
Wade

RayB:
Wade,
It's pretty obvious once you look at it. There are metal loops with "+10 vdc" and other such writing. You connect one of your multimeter probes to a GRND point and the other to the voltage point you want to test.

Did you get the right board for your machine? There are different revisions.

Wade:
RayB,

    I got to check it out more last night, and found the manual on KLOV.com (forgot they have manuals there until someone else reminded me!)  All the voltages I could see tested pretty close.  The LED on the board is on, which might tell me something but I haven't had a chance to dig into the manual to find that yet.

    I did find this out.  Put it in test mode and I got a high beep for the 5th one.  According to the manual that is a bad RAM chip.  I will try to source one of those and see if that gets it any closer to booting up.

    I'm absolultely sure everything (specifically the boards) are original in this game.  This and the Moon Patrol came from the same place, and I believe they were together most of their life, judging by the same kind of nasty cigarette tar-dust on everything, and the license stickers.  They both have the original monitors judging by the manufacture date and screen burn, too.

Wade

RayB:
Regarding the voltages, what is "pretty close" in your opinion? If it's just a little too low, that can cause RAM errors (not enough juice getting to all the parts). Your AR-II has a small potentiometer knob to adjust the voltage. For mine, I had to adjust it ALL the way down and it still read +5.4. I feel that's high, but guess what? The game works!

Also you should still clean the connectors to the board so contact is flawless. That will also ensure the juice is flowing fully. And actually, you should do this first before fiddling with the pot.

(PS: Don't fiddle with the AR-II pot with the power on. You wouldn't want to send a voltage spike to the board).

~Ray B.

RayB:
PS:
Assuming your connector is snug and clean, and your edge traces are all clean, and assuming you're getting enough juice you need to check the large orange or green things with two legs. Check for broken legs, or even missing ones! I think the board is marked with the letter C and a #. Look at the existing [are they capacitors?] to see what I mean. Then look for similar letter/number combinations where perhaps some have broken off. I know that the board WILL report ram errors during test if any of those (capacitors?) are missing or broken.

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