The game boots and runs attract mode but will not accept coins or start a game.
Game boots but will not take credits or start
Cause: A dead CPU battery let the U4 memory fill with bad settings, for example 9999999 where an adjustment should be 0 to 3.
Checks
- Enter the adjustments and look for nonsensical values, starting with credits per play.
Fix
- Replace the battery with a remote AA pack.
- With the manual, press the test button inside the coin door, use the keypad to set credits per play to a valid value, then set the other adjustments.
Systems
Related tips
- Nonsense adjustment values after a battery failure
- CPU never starts: check the reset line at U1 pin 6
- CPU LED stops just short of the full count
- Expected CPU LED flashes by game
- How to read the flashes on pre-1988 6803 games
- How to read the flashes on the last four 6803 games
- Missing lamp fuse changes the flash count
- Eight-flash LED code meanings
Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)