I have had Laser War for about four years. Last year a circuit board started smoking when I turned the game on, so, it needed repairs. A knowledgable individual on pinball machines worked on it, off and on, for most of a year untill he got it working again. Now the only complaint I have is that the machine does not seem to want to save settings changes I make, even though I follow through the entire menu options to set the changes (such as free vend and three balls per game). As soon as I turn it off/on, the changes are gone. Am I doing something wrong, is there a battery to replace like on pc's, is this something I will have to live with? Any help is appreciated.

I am new to pinball and parts. What is an MPU, where would it be located and what kind of batterys would it take?

I will look tonight. Thanks for the information. I will let you know.

Replaced the three AA batteries and all settings changes I made saved. Thanks to those of you that helped me out on this.

Well, the new batteries worked for a little while. Now the machine is back to doing the same thing. The most annoying is that I put it on free play, save it, play a game, and when I turn off\on the machine, free play is off. Is something draining the batteries? I have not tried new batteries yet. The last ones were new, out of the package. Any thoughts?

ThePostmaster: It has been a while since we talked. I have decided, after much thought, to offer up the pinball machine to you if you are still interested. I live near Lake Geneva, WI so it could work out logistically. Give me a shout one way or the other.