No manual for this game so I'm doing my best based on other manuals from games of this same system. I have 1 lone lamp that won't turn on. I'm decent at working on games. Lamp turns on when I ground the anode so my wiring & socket are good. I replaced the SCR anyways, & replaced the CD4514 that drives that set of lamps. Still won't turn on! All resistors tested. Lamp board seems like it has no issues anywhere. Could a single lamp being out be an MPU issue? If so, where do I look next?

So in this case, it seems to be a code issue. It doesn't enable in attract or lamp test, but I'll be damned if it doesn't work while playing a game!

Standup target "C"

Everything seems fine now. No stuck switches. I did just fit each socket with a resistor so I could use LED's. Maybe that has something to do with why it wasn't showing in test mode. But I'm happy now that it works in play. Good to know you have a manual I might have to hit you up sometime if I have another issue! This is actually the 2nd time I've had this game (same physical game). I had missed it!