Gottlieb New York New York High Score Save

hatrick

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I don't know much about high score saves, and how the whole battery back up thing works. My New York New York game has a 3v battery on the board the measures 3.1v at the battery (game powered off) and when I measured legs on a couple of the nearby chips (again powered off) I get about 2.7v

I'm not sure how much voltage is required to save the scores, but it isn't working.

Any ideas what the issue could be? I've attached part of the schematic that has the battery.

Thanks!
 

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After looking at the data sheet for the HM4334P-4 ram chip(upper right on the attached schematic above), it states the minimun Vcc for data retention is 2.0v. I think I'm getting around 2.7. That leads me to believe that chip is bad.

Does that seem reasonable?
 
Are you sure that is for HS saving? Does the manual mention that? Could be there only to save auditing information...
 
Are you sure that is for HS saving? Does the manual mention that? Could be there only to save auditing information...

Ha...that's a good point. It doesn't say that High scores are retained in the manual, and it does not have a coin counter, it stores the coin count electronically. You are probably correct, that it saves the auditing info. Just a dumb assumption on my part that it was for saving the high score.
Damn, I was hoping it would save scores...makes the game more fun for me when there is a number on the screen to beat.
 
Well, check to see if the audit info is being stored at power down... if so, then likely it doesn't save HS... if not, then you've got issues elsewhere.
 
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