Every score display and the status display is off.
All displays are dark
Cause: The 60 V AC fuse on the bottom board, no +60 V DC from the power supply, or the control board.
Checks
- Check the 60 V AC fuse on the bottom board (F7 on the power distribution drawing).
- Measure +60 V DC at the power supply output.
Fix
- Replace the fuse or repair the high-voltage section of the supply; if both are good, repair the control board.
The display supply carries 60 V DC (and 42 V DC); keep fingers off the power supply and display boards while the game is on.
Systems
Related tips
- Status display is off but the score displays work
- How the control board drives the displays
- Display data in attract mode
- Scores light at once and the status display stays dark
- Score display boards by generation
- Control board display connectors A1-J2 and A1-J3
- How the four-digit status display shows a "1"
- Guarding the fill tip on the back of a score display
Source: System 80 Service Manual, Gottlieb