Arcade Collecting > Restorations & repair

Galaga Restoration, My First Attempt.

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tommyguard3:
Hi everyone, I've noticed people are very helpful here so I hope you can help me out.  I got a Galaga machine from my dad, he had it in his basement hasn't been working for years and he was going to toss it so naturally I took it.  Just got it to my house Monday, and pulled all the seated chips, gave them a good cleaning and reseated them.  Voila! the game came on, and works, sound is great!

The problem I'm having right now is the stars are erratic, they are usually moving very fast looking almost like lines not stars, occassionally they start to move in a choppy way, almost like a bouncing ball, and once they actually disappeared.  Also I can't be sure since it's been so long since I've played but I think the aliens are speeding up faster than normal.  I'll get pictures and video up asap, I'm trying to get the game working properly before I start on the cabinet.

Please any help would be appreciated, I'm very new to this, don't have much electronics experience, but love the challenge and learning to fix things.

Oh the other thing is my readings are low on the voltage, but that may be my multimeter, I'll borrow a friends to double check, if it is low everywhere I read says to adjust it up to about 5.2V, but nowhere says how.  Any help is appreciated.

Thanks

beerbarrel:
There is a custom chip that controls the starfield. I don't remember its location right now but will look tomorrow. Also, their is a capacitor next the the PS connector on the mainboard. Just clip your volt meter leads across it to check the voltage. Has it been converted to a switcher?

Tracy

Mauzy:

--- Quote from: beerbarrel on January 30, 2009, 02:07:52 am ---There is a custom chip that controls the starfield. I don't remember its location right now but will look tomorrow.


--- End quote ---

Its the 05xx on the video board, but I can't remember where. Atleast thats a little closer.  ;D 

tommyguard3:
Thanks guys, the 05xx is at 4M, it looks like it has been replaced before, looks almost brand new.  Is there anyway of checking it other than swapping it? 

I've read through a lot of posts on the web, and someone had a similar problem with their machine, apparently it was fixed by switching the 74LS368 chip at 3N, any idea where I can get one of those?

How can I tell if it's been changed to a switcher?

Another problem I discovered yesterday that I hope someone has a simple trick to solve, but probably not, my dad lost the key to the coin door.  My door is in great shape, how can I open it?

I know I have a lot of questions, but I'm new to this.  Thanks again for all your help so far.  I'm waiting for youtube to process my video of the star field then I will post it.

channelmaniac:
You can try to drill the lock out or to pick it. Those are your 2 choices.

Replacement cam locks are as easy as Mailbox Locks at your local Home Depot/Lowes. I like the ones at Home Depot better.

On the starfield: Check & clean the legs on the custom chips. Bad sockets will cause that problem too.

RJ

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