Use the shared wiring to locate display faults
Segment lines come in three groups: A for players 1 and 2, B for players 3 and 4, C for the status display (and bonus if fitted). Digit lines D1-D6 plus D16 serve players 1 and 3 (and bonus), D7-D12 plus D13 players 2 and 4, and D13-D16 the status display. So a segment fault shows on players 1 and 2 or on 3 and 4, a digit fault on 1 and 3 or on 2 and 4, and one bad display can drag down its partners: with power off, unplug displays one at a time and watch the others.
The display supply runs at 60 to 69 volts; work on it with the game off and never plug or unplug display connectors with power on.
Systems
Related tips
- Display fault: board or display?
- How the Gottlieb fluorescent displays work
- Measuring voltages on a display board
- Meter check of the display board 7432
- Checking the +60 V filter caps on a display board
- Replacing a display glass tube
- How the System 80 fluorescent displays light
- Meter checks on a display tube
Source: Troubleshooting Gottlieb Displays (On Target technical newsletter, vol. 3 issue 7, 1982), Gottlieb "On Target"