System 1 driver board connectors

A3-J1 (top) is the bus and +5 V/ground from the CPU. J2 (far right) carries the Q25-Q28 coils, J3 (middle right) lamps Q19-Q44, J4 (middle left) coils Q29-Q32 and Q45, and J5 (far left) lamps Q6-Q17 plus Q1-Q4.

Systems

• Gottlieb System 1

Related tips

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