Fit a remote AA battery pack with a blocking diode
Steps
- Get a four-AA battery holder but use only three cells.
- Solder a 1N5817 blocking diode in the empty fourth cell position, between the cells and the holder's red positive output wire, with the band toward the red wire (the lead that runs to the CPU board), so the board cannot try to charge the alkaline cells.
- Connect the pack to the old battery position on the CPU board, adding an in-line connector so it can be unplugged.
- Mount the pack low in the backbox, well away from the CPU board.
Systems
Related tips
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Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)