Space invaders part 2 Problem! please help!

noname707

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I recently picked up a space invaders part 2 cocktail machine. When I turn it on it does two different things sometimes it makes an explosion sound and then a siren game sound and the screen is bright orange and then it disintagrates into being just a black screen. Other times when I turn it on it shows what looks like a color chart with lines in it and it makes no noise and then it disintegrates into a black screen. what is the problem? a bad board?
 
I don't want to sound like a broken record/cd but you always need to check and re check you supply voltages. If the +5 volt line is low it will do strang and screwy things.
 
I don't want to sound like a broken record/cd but you always need to check and re check you supply voltages. If the +5 volt line is low it will do strang and screwy things.
how do I adjust the power supply on this. I know how to on most machines but I'm not sure where the adjustment is on this machine.
 
how do I adjust the power supply on this. I know how to on most machines but I'm not sure where the adjustment is on this machine.

pot on the power supply......


OOOPS!!!! SORRY WRONG POST!!! LOL!!!

Sorry been drinking..... one hell of a day at work!!!
 
There is usually a adjustment knob on the power supply unit. I am downloading the schematics as I type this so I am not shure if it is a switching power supply or a linear one. If it is a switching (switcher) power supply there will be a knob on the back, usually white. Here is the one I bought to replace a bad supply in my Heavy Barrel game. Notice the white knob in the back, that is the "pot" you use to adjust the +5 volts. I adjusted mine to 5.15 volts and works fine. If you don't have one of these supplies I would suggest you get one. Many of the Linear supplies are really old and will fail at some point. They can fry your board making it unrepairable.

http://cgi.ebay.com/330571172387?ru...72387&_sacat=See-All-Categories&_fvi=1&_rdc=1

This is the manual for that game....I think. If it is you should print it out and put it in you cabinet.

http://www.crazykong.com/manuals/SpaceInvaders.man.pdf

This is a link to a guide for checking your voltages.

http://www.elektronforge.com/TestMdwPS.htm

hope this helps some.
 
I thank all of you for your help. but remember this I a cocktail cabinet. that does not have a switching power supply. I don't know what kind of power supply it has because I can not see one. There is what looks like the box of a power supply but after closer inspection it is just a fuse board of some sort. with absolutely nothing to adjust on it. but if anyone could tell me where the power supply adjustment is on this machine that would be great. again it is not a switching power supply I know you adjust those with the knob.
 
again thank all of you for your help especially KB. I was able to find an owners manual of Si part 2 and I found where the power supply adjustments where. Adjusted them and it works great now. Thanks
 
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