Bottom pop on my JP randomly activates on its own. If you tap the plastic cover it will activate.
No clue what to look for.
Adjust the leaf blade switch for it below the playfield.
Turn the game off. Lift playfield up and lean back. See the leaf blade switch ? The long one with the plastic spoon is pushed by a plastic rod coming down from the pop bumper skirt. This plastic spoon should be clean, ( not worn on older games ) well centered on the rod, just resting on it, not pushing it up. The shorter lower leaf blade switch should be close enough so the slightest ball hit triggers it yet vibration doesn't set it off. A little adjusting/tweaking, and you'll be fine.
LTG : )
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