A5, A6, A8 and A20 plug identification

A5J1: brown/brown/black on pin 1 and white/blue/blue on pin 2. A6J1 is a 10-pin .156 in Molex keyed at pin 4; A6J2 a 9-pin keyed at pin 7. A8J1 power in (with a ceramic filter): brown/red/red, brown/yellow/yellow. A8J2 display power out: blue/gray/gray, white/gray/gray. A20J3: red shielded, white/yellow/yellow. A20J1: blue/gray/gray, green/green/brown.

Systems

• Gottlieb System 3

Related tips

• The A20 auxiliary sound board
• Never hot-plug the A8 board or the display
• Both sound board LEDs dark
• Parts on the A5 auxiliary supply
• The A6 sound board
• The A8 dot matrix controller board
• Display voltages the A8 board should supply
• A1 CPU board plug wire colours

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