Never hot-plug the A8 board or the display

Pulling or fitting any connector on the A8 dot matrix controller, or the display itself, with power on damages the board set. Switch the game off first.

The A8 controller makes roughly +62 V, -100 V and -112 V for the display; keep hands off it with power on.

Systems

• Gottlieb System 3

Related tips

• Display voltages the A8 board should supply
• Dot matrix dark: +62 V missing
• Garbage on the dot matrix at power-on
• The A8 dot matrix controller board
• DMD controller LED stays on
• Rebuilding the A8 high-voltage section
• A5, A6, A8 and A20 plug identification
• Nonsense message at boot, game stuck in a loop

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