Quoted from barakandl:Since you have already powered it all up, on the MPU check TP5 for +5vdc. Check TP2 for +12vdc (will read like +16v). TP3 for +21.5v.
On the driver carefully check tp4 for +185v
On the playfied and backbox check for +6vdc on the common bus side of a feature lamp.
General illumination lamps is on coin door, playfield, and backbox.
If something is missing report back or work backwards towards the rectifier board.
I'd like to thank you for your help! I was testing voltages as you suggested, and somehow shorted something on the rectifier board to ground and suddenly the game works. I was filling out the post below when I got to TP4 on the rectifier board and had my multimeter on ground trying to test TP4 on the rectifier board, my hand slipped a bit and I touched the other lead to one of the fuses (F2 or F3, not sure which), there was a tiny spark and suddenly the game boots fine every time. The left sling isn't firing but I will get a replacement for that. There are J-26-1500s in my slings and the game manual calls for J-26-1700s... I'm going to stick with the 1500s to keep it how it was I assume. Anyway, here is what I was seeing for fun. I appreciate the help as I learn this stuff!
Here's what I'm getting. Not quite sure where i should be grounding? The screw on the MPU or the braid at bottom of backbox. I assumed braid.
MPU TP5 - 5.0v
MPU TP2 - 10.55v
MPU TP3 - 23.55v
Driver TP4 - 249.9v
Playfield/Backbox Feature Lamp - 3.9v if i did it right on the back box, but these are LEDs...
Under the playfield, any GI lamp i cant seem to get a reading other than like 1.4v. But on any non-GI lamp (these arent lighting up i assume because the game wont boot) I get 6.4v.
More importantly, on the rectifier board I'm not getting much from TP4. Not sure where my mistake was? Here are the voltages I'm getting from the rectifier board test points:
Rectifier TP1 - 6.47v
Rectifier TP2 - 249.7
Rectifier TP4 - 1.7v
^^^it was at that point as I tested TP4 over and over again the game started working, minus a sling.