Looking to troubleshoot the backbox controlled lamps in Meteor. All other game controlled lamps work fine, but not the five backbox ones (Tilt, Shoot Again, Game Over, High Score to Date, Match). They do not light at all in controlled lamp test. All the backbox GI works fine.
I have tested the controlled lamp bulbs and they all work in other backbox GI sockets.
When I jump the SCRs to ground, I get the following behavior:
When jumping any of the SCRs except for the Shoot Again one, BOTH the jumped lamp and Shoot Again light very dimly. If I pull one of the lamps, the other goes out entirely. When I jump the Shoot Again SCR, nothing happens. I replaced a SCR (actually MCR, Q33, for Game Over) but got the same behavior.
I began testing continuity from the tab to the connector, started with Tilt, and got successful continuity. So something is off with the circuit.
There are some wire hacks I note below in the picture. The Shoot Again, Match, and Game over wires were all cut at some point and then twisted/soldered back together - but I confirmed they are the correct wire color matches. I will fix this with shrink tube but this doesn't appear to be the source of the problem.
I located two other cut wires - one blue and one yellow, noted below, but no obvious loose end to match them with.
Thanks for any help!