Arcade Collecting > Restorations & repair
Galaga Restoration, My First Attempt.
erlsjj:
Well, my Galaga friend, you have come to the right place. I too am fairly new to this, but I have learned quite a bit over the last couple of months since I started working on my Galaga.
The first thing you should do is get the manual here: http://www.arcadedocs.com/vidmanuals/G/Galaga.pdf
It has all the schematics which are very useful. To adjust the voltage, there is a variable resistor on the power supply board (assuming you have the original linear power supply). See pg 7-4 in the manual. Turn it clockwise to crank up the voltage. I adjusted mine to 5.2V. You can tell if you have the original power supply if you have a big board on the left side of the cabinet and a big board with transformers on the floor of the cabinet. If not, then it has been replaced with a switching power supply (which is much smaller).
The problem I had with mine was a missing 07xx chip (synch generator) at 1N on the video board. I ended up ordering a replacement chip from http://fpgaarcade.com/. Not sure if they have 05xx chips, but you might check.
For the coin door, you'll have to access it from the back. The coin door lock is held on with a large nut that you can unscrew if you can get at it.
tommyguard3:
Thank you, that is very useful information, can't wait to get home and check my voltage now that I know how to adjust it. The site you gave me doesn't appear to carry any of the parts I'm looking for, but thanks for trying. The manual is very helpful thanks for that, appears I have the original power supply.
Here's the video showing what the star field looks like, I just killed everyone except one alien in the first level so I could film it, not the best quality as I used my blackberry, but that is exactly what the stars look like.
I really don't think the 05xx chip is the problem it looks to be in very good shape, does anyone know a way of testing it?
orion:
I wouldn't fuss yet with trouble shooting the board. Get the power supply in order first and then take it from there. Keep in mind I am also a noob at this, however when I got my Galaxian all it would give me was a garbled screen and bad ram/rom messages. I replaced some capacitors on the board (on Galaxian and Pac Man the DC conversion is on the board) and it fired right up. It was a four dollar fix and if I didn't make sure the power was right at first I would have been replacing all kinds of ram and rom chips.... because the machine was telling me they were bad. Weird things happen when they aren't getting the juice they need. It very well may be something else, just make sure the power is right first and foremost.
SirPeale:
--- Quote from: tommyguard3 on January 30, 2009, 02:02:42 pm ---I really don't think the 05xx chip is the problem it looks to be in very good shape, does anyone know a way of testing it?
--- End quote ---
Chips don't always burn up when they go bad.
tommyguard3:
Okay so we have a problem...that's a good thing at least I know where to start fixing...lol.
My board is only getting between 4.5-4.6v I found three knobs that could be turned on the power supply which I'm assuming are the variable resistor you are talking about, but turning them did nothing to change the voltage. :dunno So where do I go from here?
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