How to properly clean battery damage off a MPU board

This is the next video in my series of work on Paragon. After the first look ( I discovered there were still issues with the MPU board that were the result of continued corrosion even after the battery was removed and the board was supposedly cleaned. Whoever did the previous work didn’t clean the board enough and corrosion continued. I’m going to do my best to salvage the board.

Upgrading Gottlieb System 80 MPU board with new battery pack

One of the first things you have to do when you get an original Gottlieb System 80 game is deal with their on-board NiCad battery pack, if it has not already been addressed. Gottlieb installed these batteries on the actual MPU board itself and like on other games, it’s a common cause of serious problems with the game. The batteries begin to leak after awhile, releasing electrolytes that corrode the MPU board and the components on it. This can happen even if you don’t see any obvious leaks. The batteries need to be replaced. There are a few options you have to do this: a remote battery pack (3 AA batteries along with a blocking diode to keep them from being charged if they’re not rechargeable batteries), a 2032 lithium coin cell, or my favorite, a 5.5v 1.5F memory capacitor. The memory cap will last the longest and will not destroy any components on the board. It will keep a charge for at least a month or more without power. Here’s a video of me adding this fix to a Gottlieb System 80B MPU


Replacing a battery with a coin cell – Bally 6803 Escape from the Lost World

In this video work, continues on a newly-acquired game, 1987 Bally “Escape from the Lost World” – a late-model 6803 MPU game that instead of mounting a remote battery pack or memory capacitor, I’m going to show you how simple it is to install a 2032 lithium coin cell holder on the motherboard and use a cheap coin cell battery instead. This is such an easy fix that you don’t even have to remove the board from the game (if you’re careful and the board doesn’t need cleaning).

First Look: 1978 Bally Supersonic – damage done by batteries takes its toll

Today’s I’m looking at a 1978 Bally “Supersonic” pinball machine. A friend had this in storage for a long time. While the game was in pretty good shape for its age, the original MPU board still had the battery on it, and the electrolyte from it leaked all over and damaged many components. Here’s a first look at the game.

Adding a memory capacitor to a Gottlieb Sys80 “Jacks To Open”

Now that I’ve got space to pull more of my project machines out to work on them, I’m diving into Sys80 stuff. The first order of business is to work on a “Jacks To Open” machine, which is a solid-state remake of Gottlieb’s popular wedgehead, “Jacks Open”. This game came with the battery removed (or maybe I removed it when I got it – I don’t remember honestly) but the MPU board was in good shape, but the game wouldn’t remember any settings because obviously, there was no battery-back-up.

This is a simple fix, and for these games it makes more sense to add a memory capacitor than a remote battery pack, so in this 4-part series, I go over adding the memory capacitor to the machine. Check it out:

First Look: Gottlieb “Charlie’s Angels” and the damage batteries do

This is a quick post of a short video I shot awhile back that I hadn’t had a chance to upload because I’ve been spending so much time renovating the new pinball place, but I wanted to share with you all soem of the new pick-ups. I’ve been on a moratorium of pinball buying but every once in awhile the price is too good to pass up, and some of these games I believe if I don’t get them, they’ll end up cannibalized and turned into a hipster’s coffee table — we can’t have that if the game has a chance of living again, so into the repair queue it goes!

In this video I give you a “first look” at a new game before I’ve unloaded it and show you the damage caused by a leaky old battery and why that’s so bad.

First Look: Bally Black Rose and dealing with leaking batteries

Another deal came my way recently and as usual, when you’re out of room and almost out of money, and someone offers to sell you a game, I threw out a pretty low number and it was accepted.  Actually, I’ve been wanting to get a Black Rose pinball machine for awhile.  These early Bally/WMS DMD games are quite good IMO, and they bridge the gap well between the older games and the more modern ones with extremely complex rulesets.  Like its predecessor, Party Zone, Black Rose is a very fun game that doesn’t require curling up with a big printout to understand the ruleset and enjoy the gameplay.

However, first things first… when the owner told me they had no key to the backbox I suspected the worst…

And as expected, we had battery issues, but this looks like it was rescued in time…

Remember, the first rule is to neutralize the acid on the board and then clean it thoroughly.  Then make sure everything is thoroughly dry before you put the board back in the game.

If you want details on how to install a remote battery pack, see this article: