First off, the ground (looking) braid that connects all of your GI lights is not ground. Those braids are your hot wires that splice into the red wire at connector J1 at the rectifier board. The multiple points of white wires at all your GI lights is ground.
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Pull the J1 connector on the rectifier board at the transformer. You should have one red wire, one white wire, two blue wires, and one blue/white wire in that connector wafer. The blue/ white is the hot wire for your flippers. If your flippers are working, then ignore the blue/white wire.
The white wire is ground for your GI lights. The red wire is your GI hot wire and will splice in to the braided wire that is soldered along the bases of all your GI lights. The two blue wires are the hot wires for your controlled lamps. One of the blue wires supplies power the four lamps down between the flippers. The other blue wire splices in at various locations around your play field.
Make sure the connectors for the white wire, the red wire, and the two blue wire are not collapsed or folded over folded over (you say you are getting voltage at the test points so these four wire connectors should be OK). Nevertheless, look inside the wafer and assure none of the connectors are collapsed or folded over.
If the above checks out, then go to your lamp driver board. All of your controlled lamps will connect via LDA connectors J1, and J2, and J3. There will be other wires on these 3 connectors besides the controlled lamp wires but the blue print does not address this but be aware that wires are going all over the place in the back box.
With the above in mind, if you have no control lamps in any form, I am guessing the connector to look at is J4 on the LDA. Pull it an look inside to make sure none of those connectors is folded over or broken. These will be had to see; You might need a magnifying glass. Since the blueprint, as mentioned above, is not clear then have a look inside of the J1, and J2 and J3 connector wafers, as well. I mention all of this because when I
re-pinned two of my Sterns I found broken connectors inside some of my board connectors.
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After you work all of the above, know that some of the wiring on LDA connector J4 leads back to the MPU and the SDU so you could have an issue with one of these boards.
Lets go one step at a time; Try checking what I wrote about the "*" line. Come back and tell me what you find. If you have no luck then I'll dig deeper into the blueprint.
BTW: The lamps in the back box look to be on a different circuit but I need to study that some more.
Beaufort, NC
