CPU chips to check for lamp faults
On the CPU board, Z32 handles lamp data and Z34 and Z35 the lamp latch strobes, all fed through Z33 and all leaving on connector J4.
Systems
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Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)