Mr. Pinball tip for Tuesday, October 25, 2016

When replacing batteries in a Bally early solid state machine, you can use 3 regular AA batteries instead of rechargeable batteries. To do so you will need to install a diode so that the machine doesn't attempt to charge the batteries while the game is on. The diode should be on the positive connection between the batteries and the board. The diode should have the banded end of the diode towards the board. This whole setup is assuming you have installed a separate battery holder off the MPU board in place of the original rechargeable battery.
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