On power-up the game beeps continuously in step with the sound board LED; the display stays off and other board LEDs are dark, though GI lights.

Constant beeping, display blank, GI on

Cause: The CPU memory battery is completely dead or missing, so the board will not boot (a weak one gives the low battery message instead). Some games stay silent instead of beeping.

Checks

• Measure the battery and check for it being missing.

Fix

• Fit a new battery (see the battery replacement entries).

Systems

• Gottlieb System 3

Related tips

• Lithium battery leak damaging the CPU board
• Battery error stays after a new battery
• CPU battery and socket parts
• "Control board error, Low battery or Bad U3 or U6"
• Battery reads 3 V but the game says it's low
• Fitting a CR2430 socket on the CPU board
• Getting past the low battery message
• Using a remote two-AA battery pack

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