Totals or settings in bookkeeping steps 1 to 15 are wrong or blank. When a value in steps 1-10 or step 15 blinks, the game suspects it is corrupt.

Bookkeeping totals or score levels are wrong or missing

Cause: Lost or corrupted battery-backed memory, or a faulty control board.

Checks

• Go to the faulty step and clear it to zero with the credit button, then move on.
• Score levels (steps 11 to 14): clear, then hold the credit button until the wanted level appears before moving on. When these levels get lost, the game refills them with defaults stored in its PROM.
• Once corrected, cycle the power and look at the values again.

Fix

• If the data cannot be cleared or new levels cannot be set, the control board is faulty.
• If the values are lost again after a power cycle, the control board (memory back-up) is faulty.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• Scores light at once and the status display stays dark
• Random game over, lost credits or erratic features
• Game check-out, part 2: what a healthy power-up looks like
• How the control board reset circuit works
• A playfield switch triggers the wrong response
• All displays are dark
• Checking lamp signals during test step 16
• Game check-out, part 3: walk through bookkeeping and self-test

Source: System 80 Service Manual, Gottlieb