Duotron
Gottlieb, 1974You're currently viewing posts by Pinsider woz.
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Please post some pics of the schematic...specifically where power is switched to the upper half. Looking at schematics of similar 2 player games of that era (Jumping Jack/Big Shot) I would check the game over relay (QB) and switches on the control bank and work back from there. The highlighted switch feeds power to the section you describe as not working.
Here's the section to look for (this is from Jumping Jack):
It's not a fuse as some of the playfield coils do work and they all share the same fuse.
Back in the day many years ago when I was learning how to repair EM telephone exchanges (more relays than you can imagine!) an engineer told me to always work backwards when tracing through a schematic trying to track down a fault - this has advice has served me well over years.
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