Did I killed Ms pacman or did Mario???

Pacman36

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I have a coffee table I paid $27 dollars for at a consignment store in Petaluma CA.* The game*was working fine but it's monitor was bad.*** I tried to find a new monitor but they have become pretty expensive.* Searching barn sales I found a Nintendo upright double screen Caladash with a bad cabinet (rain) but all else working.***Paid $40* for the game. *The monitors were*cherry.** I dismantled the huge game and took all but the lumber.**When I came home I quickly tried to*hook up the*monitor finding that the wiring harness was different I cut the one off the monitor and proceeded to incorrectly wire the*outputs(Dumb). *The Green output to the* green ground (found out after looking up schematic)*on the monitor and zap.* 60 volts*Apparently my monitor ungrounded has a voltage?)** There were two resistances blown.* Well I replaced them.** Taking a volt meter*there was no voltage coming from the color green output like the blue and red.**I read the schematics on the ms pacman and the sanyo nintendo monitor and I grounded the monitor to the transformer*and hooked up the rest and*powered* it up and*zap the*main fuse on the monitor blew and there was some popping.* Ok I'm going to Arcade hell if I don't atone for*killing a Ms pacman.**Since I have no Idea how to test*the*chips.** I'm thinking* I should try replacing the* chip at 7F on the Ms Pacman mother board (n82s123N8211 8211) next line (0120.07axn-axn?* Midway 1981, it seems to be the next in line in the circuit.** The chip has voltage for the color red but nothing for green.*** Well I'm not sure how to trouble shoot the issue.* None of the chips seem to have been damaged but I'm going to start replacing chips until I get a signal.** The Resistances blown were at R13 R15. I found a guy at hobby chips who can get me a 7F chip for ten dollars. but I'm pretty much convinced I'm an idiot when it comes to fixing games. If you have advice I would appreciate it.
 
First of all, you used 56 asterisks. Impressive.

Secondly, Nintendo monitors are WAY different than standard 19" monitors (Like Ms. Pac).

Thirdly, 7F is a proprietary chip to the Ms. Pac man board, it cannot be replaced without being rewritten by a writer or burner.

Forthmost, Dont mess with the board, its probably fine (unless youve already begun hacking it apart). You are WAY overthinking a very simple issue. For your Ms Pac, you need to find out what model monitor your have, either Electrohome G07 or Wells Gardner. Then, we can find you a replacement chassis or tell you how to fix your old one. Now before you kill yourself putting a square peg (Nintendo Monitor) into a round hole (Pac Man), take some pics of the monitor inside your Ms Pac, tell us exactly whats wrong, and we will take it from there.
 
First of all, you used 56 asterisks. Impressive.

Secondly, Nintendo monitors are WAY different than standard 19" monitors (Like Ms. Pac).

Thirdly, 7F is a proprietary chip to the Ms. Pac man board, it cannot be replaced without being rewritten by a writer or burner.

Forthmost, Dont mess with the board, its probably fine (unless youve already begun hacking it apart). You are WAY overthinking a very simple issue. For your Ms Pac, you need to find out what model monitor your have, either Electrohome G07 or Wells Gardner. Then, we can find you a replacement chassis or tell you how to fix your old one. Now before you kill yourself putting a square peg (Nintendo Monitor) into a round hole (Pac Man), take some pics of the monitor inside your Ms Pac, tell us exactly whats wrong, and we will take it from there.

Thanks...I actually was compelled to count the asterisks..had to do it 4 times...
 
Just a few things you should know in case you plan to keep trying to make a monitor that came out of a nintendo game work with a non nintendo board. Most of the monitors that come out of nintendo cabs run off 100V AC unlike many other games that use 110-120V AC to power them. As you found monitors that typically come in nintendo cabs have smaller pins than most other monitors do to connect the incoming signal from the game board. Also nintendo game pcb's used an inverted signal and the monitors were made to work with this. Therefore a game like pac man or whatever will need a video inverter so the image will represent correctly on the nintendo monitor. While it's not impossible to make the nintendo monitor work, it's kind of a pain to do so.
 
I have a coffee table I paid $27 dollars for at a consignment store in Petaluma CA.* The game*was working fine but it's monitor was bad.*** I tried to find a new monitor but they have become pretty expensive.* Searching barn sales I found a Nintendo upright double screen Caladash with a bad cabinet (rain) but all else working.***Paid $40* for the game. *The monitors were*cherry.** I dismantled the huge game and took all but the lumber.**When I came home I quickly tried to*hook up the*monitor finding that the wiring harness was different I cut the one off the monitor and proceeded to incorrectly wire the*outputs(Dumb). *The Green output to the* green ground (found out after looking up schematic)*on the monitor and zap.* 60 volts*Apparently my monitor ungrounded has a voltage?)** There were two resistances blown.* Well I replaced them.** Taking a volt meter*there was no voltage coming from the color green output like the blue and red.**I read the schematics on the ms pacman and the sanyo nintendo monitor and I grounded the monitor to the transformer*and hooked up the rest and*powered* it up and*zap the*main fuse on the monitor blew and there was some popping.* Ok I'm going to Arcade hell if I don't atone for*killing a Ms pacman.**Since I have no Idea how to test*the*chips.** I'm thinking* I should try replacing the* chip at 7F on the Ms Pacman mother board (n82s123N8211 8211) next line (0120.07axn-axn?* Midway 1981, it seems to be the next in line in the circuit.** The chip has voltage for the color red but nothing for green.*** Well I'm not sure how to trouble shoot the issue.* None of the chips seem to have been damaged but I'm going to start replacing chips until I get a signal.** The Resistances blown were at R13 R15. I found a guy at hobby chips who can get me a 7F chip for ten dollars. but I'm pretty much convinced I'm an idiot when it comes to fixing games. If you have advice I would appreciate it.

you lost me with the asterisks
 
Eh... You lost me.

So, you took a Nintendo style monitor and wired it into a Ms. Pac cocktail. You hooked the green video signal to AC ground. And what did you plug the monitor's power into? Please tell me you didn't try to run that Nintendo monitor without an isolation transformer. If you did, you probably fried all kinds of stuff...

What does the game do now? Does it just blow fuses? Did it play blind before?

Sorry you had to learn the hard way - but if you wired it the way I think you wired it, you may have fried your Pac board as well as the monitor. But, let's step back, and troubleshoot in order. Disconnect the monitor entirely and connect up your game board. Turn on the game and see what happens. It should be able to coin up and play, and you can hear the music and sounds, but obviously have no picture.

And for reference, you're going to have a real hard time running a Nintendo monitor on a Ms. Pac. The video signals are inverted and the monitor runs on 100v. It's doable, but requires some modifications. It will probably be lots easier to just repair the Ms. Pac monitor.

-Ian
 
Welcome to the wonderful world of arcade collecting. Unfortunately you have now made a few mistakes getting your game going (As most of us did when we first got into the hobby). Don't give up. You may have other game enthusiasts in your area, and they may be able to help. This forum is great place to find the resources needed to help bring your machine back to life. Good luck on your project.
Definitely the Quote of the Day: "It's only Money"
 
All good suggestions, but before he gets started on the MsPac there are more pressing issues. First, he should repair his keyboard. Start by swapping the keycaps on the * key and the key.
 
but I'm pretty much convinced I'm an idiot when it comes to fixing games.

This. No offense, but nobody should be diving into this without learning first. Put the games away. Read these forums. Ask questions. Learn. Don't just go buy shit and start swapping and cutting and hoping it'll all work out.

Slow down. The people on this forum are very knowledgeable and helpful, and if they can help a novice like me bring back several games from the grave, they can help anyone. You'll be fine.
 
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Hindred,

I'm going to disagree with you. Not because I think you are wrong (you aren't), but because that's how I have learned since day 1. My first computer was disassembled the day I got it. My mother was beside herself. What kind of idiot would spend $300 (a lot of money then, especially to a kid) and then take it apart having never even owned one before...

If you can afford to break things, go for it. Just remember the lessons that stay with you will be from big mistakes...
 
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