Bottom board plugs A7-J1 to J8

J1 carries front door switch strobes, return 7 and the anti-cheat (slam) switch with an earth ground on pin 12. J2 has coin chute lights, the flipper switches, +24 V and the coin lockout. J3 has the 5 V and 3 V display filament AC, lamp ground, 6.3 V GI and +6 V lamp supply. J4 pins 1-11 are all ground. J5 has +6 V, grounds, +24 V, flipper switches, 6.3 V GI and 25 V AC. J6 has the match, tilt and ball-in-play lights, J7 strobes and returns plus the AC input, and J8 the speaker and earth ground.

Systems

• Gottlieb System 80

Related tips

• Bottom board fuses and what each feeds
• The +12 V filter capacitor on the bottom board
• Check the bottom board and playfield fuses early
• What each System 80 board does
• Game does not power up properly
• The play-test button will not start the test sequence
• All displays are dark
• Score displays are off but the status display works

Source: System 80 Service Manual, Gottlieb