Player unit sticks: clean off old lubricant, don't add more
A sticking player unit had been lubricated repeatedly over the years, and the oil had turned to a glue-like gum on the linkage and gear. Taking the unit apart and cleaning it with isopropyl alcohol, with no lubricant afterwards, made it work properly again. Stepper linkages and gears should run clean and dry.
Systems
Games
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Source: Pinball Repair help group!! (Facebook group)