Using a remote two-AA battery pack

Steps

• Use exactly two AA cells: the DS1210 tolerates at most 4 V, so three cells are too many.
• U6 needs at least 2 V and drops about 0.3 V, so the pack must give at least 2.3 V; two fresh AAs give 3.0 to 3.4 V.
• No blocking diode is needed, since one is built into the DS1210.
• Mount the holder off the board so a leak cannot reach it, and wire it to the battery pads.

Systems

• Gottlieb System 3

Related tips

• CPU battery and socket parts
• Battery reads 3 V but the game says it's low
• "Control board error, Low battery or Bad U3 or U6"
• Battery error stays after a new battery
• Lithium battery leak damaging the CPU board
• Constant beeping, display blank, GI on
• Fitting a CR2430 socket on the CPU board
• Logic chips worth stocking

Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)