Charleston, SC
Try going into switch test and see if it registers when you put the drop target down. If not something is probably wrong with the optical switch ("opto") for the drop target - there is an infrared LED and receiver pair on the little board under the playfield. First thing to try would be cleaning these.
From pinrepair guide:
Cleaning Optos.
Optos can get dusty from the "black dust" inside a game. To clean an opto, use a Q-tip dipped in glass cleaner. Wipe the opto with the Windex-wet Q-tip, then dry the opto with a clean, dry Q-tip. Do NOT use canned air to blow optos clean! The air in these cans is too cold and can damage an opto.
