Quoted from Ptav:I’m guessing the drivers are numbered, or how do you track which driver powers which bulb?
The lamp driver schematic shows this info. Every bulb on the playfield is described in some text next to connectors J1, J2, J3, J4. Each one of these is wired to a lamp driver SCR labelled Q14-Q53
Quoted from Ptav:One bulb (drop target special light) works during the self-test but not during game play! Any ideas on how to fix this? Thanks again all
Perhaps that bulb never turning on could be a switch problem instead of lamp problem?
All 5 of the drop switches need to register correctly for the lamp to ever turn on.
Check if all 5 of the associated switches for that lamp work or not:
Reset all 5 drops to the up position and start a game. Check if each individual drop are scoring points and making a sound during a game when they fall. Also when they all get knocked down they reset to the up position.
Does it always reset to the up position during a game after all 5 getting knocked down? If so, then the switches are working fine and not the cause of the lamp problem.
Also check in switch test that as each individual drop falls it changes the last closed switch number to the correct switch number. There should be 5 unique switch numbers displayed as each drop falls.
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