System 1 CPU board connectors

A1-J1 (left) brings +5 V, -12 V and ground. J2 (top right) carries display segment lines and J3 (lower right) the display digit strobes. J4 is unused. J5 (bottom centre) is the bus and +5 V/ground to the driver board. J6 (bottom left) has the coin door switch lines and J7 (far left) the playfield switch matrix.

Systems

• Gottlieb System 1

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Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)