Arcade Collecting > Restorations & repair
I don't believe it, another classic added => Centipede ! FINISHED !!!!
sfrascella:
--- Quote from: Level42 on March 11, 2007, 03:56:04 pm ---Besides not having the money for that, there's no glory in it.... restoring the game is at least as much fun as playing it...
--- End quote ---
I couldn't agree more. I have a Defender and a Galaxian that I'm working on right now, and would probably break even on the Defender if I were to sell it but the experience and the fun I have had far outweigh the cost to me.
fredster:
--- Quote from: RayB on March 11, 2007, 12:48:11 pm ---Wow, so much work, $$ and shipping, with no guarantees, when you could just buy a working board.
--- End quote ---
RayB, He wants to learn how to fix these things. I fixed a few of them, and it's really rewarding.
Level42, you are on the right track, but it's not brain surgery. I doubt if it is very much that's wrong with it. Those Ram Chips are the most common failure. Replace those chips with seats and plug them in.
It could be a +5V problem if it isn't the ram chips. The 12V is for the audio. You won't know if it's working until you can coin it up. It should have beeped. But put it into test mode after you replace the chips. Try it AFTER every chip!
I hope you found some more repair logs - Mike's arcade knows a lot about this: http://www.mikesarcade.com/arcade/repairs/centipede.html
You did ask the "elders" on the RGVAC?
One other tip: Those old boards get really sensitive to soldering. The chips are rotted to the board sometimes and you can pull up the traces when you take out the chip. UGH I hate that. Make sure you get rid of all the solder before you start tugging at it. Check the continuity of the traces after you put the seats in to make sure they connect where they are supposed to.
That looks like a Ram error to me. Check the history on the RGVAC.
Level42:
Yep Sfracella and Fredster are right. I doubt the 5V is a problem, it's VERY good still after all this time (5.01 Volts on my Fluke DMM). There's also almost no ripple on the DC supply voltages, so I actualy wonder if the Big Blue needs replacement....well It coulnd' hurt I guess for just 11 bucks...
Yes I found the repair guides on Mikes Arcade, but none of the Centipede one's are about my problem as far as I read.
Indeed the RAM chips seem to be fragile, there are already three on my PCB replaced before.
I aksed some questions to arcadechips and will then order a nice set of RAMs...
Thanks for all the help Fredster !
Level42:
Incidently found a lot of Centipede Repair info here:
http://www.2coinsperplay.com/Tech/Video/repairs/repair%20Logs/Centipede/Centipede%20Repair%20Log.html
And there's also a good general write-up of Videogame PCB repair:
http://www.2coinsperplay.com/Tech/Video/Hints%20on%20repairing%20arcade%20boards.html
If you read the section about bad RAM, you can see this is exactly "my" problem...great...
RayB:
Level, is it safe to assume at this point, that you've given the board a proper scrutinizing, looking for broken traces, broken capacitor legs or missing caps? Bad/Broken caps feeding power to the RAMs will also result in RAM errors.
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