Baby Pac Man Help

Tuck

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Donor 2012-2013
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Should this be in the pinball section, anyhow my high scores are all messed up, if I reset everything to 00 and play a couple games its fine. As soon as I shut it off and turn back on there all messed up again, I'm assuming this has something to do with the MPU board, is there a chip with a battery in it?
 
Should this be in the pinball section, anyhow my high scores are all messed up, if I reset everything to 00 and play a couple games its fine. As soon as I shut it off and turn back on there all messed up again, I'm assuming this has something to do with the MPU board, is there a chip with a battery in it?
5101 CMOS and there would have been a nicad battery at the bottom of the MPU. which should have been removed a very long time ago. the Baby Pac-Man at work is running a replacement Alltek MPU, so none of that's an issue there, but if your MPU is original you should entertain replacing the 5101 with NVRAM.
 
Definitely look at the MPU to see if there is any battery damage. The battery is by the 5101. It creeps up into the socket so the socket usually needs to be replaced. Also the 5101 chips do go bad. I test every one when working on a board. On the Bally MPU I typically install a 4F memory capacitor in place of the battery. Cheaper than NVRAM, easy to install, and works great. Did that on my Baby Pacman and my Stern Berzerk.
 
Definitely look at the MPU to see if there is any battery damage. The battery is by the 5101. It creeps up into the socket so the socket usually needs to be replaced. Also the 5101 chips do go bad. I test every one when working on a board. On the Bally MPU I typically install a 4F memory capacitor in place of the battery. Cheaper than NVRAM, easy to install, and works great. Did that on my Baby Pacman and my Stern Berzerk.
yeah NVRAM is expensive. how long does the memory cap hold with the game being off?
 
It depends on the 5101 but with the Low power version I have had a game sit for over 6 months and it retained the data. Anytime it is powered for a bit recharges the capacitor. Values off 1F and 1.5F are often used but I have been using 4F and so far haven't left any game off long enough to have it lose the settings. I don't do it on Williams games (often use a coin cell or NVRAM on those) but for early Bally/ Stern and Gameplan board the 4F seems to work great.
 
Some one snipped off the battery at some point, that's why I couldn't find it
 
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