Telling the logic filter cap from the coil filter cap
Of the two large capacitors on the bottom panel, the 12 V logic one is the smaller (usually orange, 6,800 mfd, about 1" by 3") with no resistor across its leads. The other, with a resistor across it, filters coil voltage and matters much less. Jacks to Open uses two orange logic capacitors in parallel, which can be replaced by one.
Systems
Related tips
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Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)