Ok guys, I thought I could solve this problem on my own but I haven't been successful.

I have a data east Jurassic park with no coils or flashers working. I have done a bunch of stuff chasing another problem since they last worked, so I'm not exactly sure what I messed up. My first thought was no power, but I'm getting 74 volts at j7 of the ppb. J7 is the output as i understand it after it comes from the transformer, is rectified, and fused.

From there the schematic isn't very clear on where the circuit leads. I would assume that power goes across each coil in the game and then back to the cpu. At the cpu it would go through a transistor that grounds it and of course some logic. All of the transistors I checked were not shorted. I also checked every fuse clip and fuse in the game and didn't find any that were bad.

This is a rottendog mpu and it appears to be booting. 5v and pia will come on, then pia goes off and blank comes on. 5 volts is always on.

Things that happened since this worked last- (all of this was done for a gi issue)
I replaced q28 on the mpu
I replaced u1 on the mpu
I swapped u5f on the mpu
I replaced the header pins on ppb for j5 and 2 fuse clips
I replaced the relay and diode on power supply
I replaced all gi connectors and pins

Powered it back up and q28 blew apart. So I removed q28 from the mpu and disconnected the gi relay connector on power supply. Gi works now, but solenoids and flashers don't.

I feel like it has to be something dumb, like a connector unplugged, fuse, or missing ground. The reason I'm posting is I think I've checked those dumb things and still it doesn't work. Can someone with more experience than me chime in with a suggestion or something to check? Thanks!

Update - I have voltage at the coils and can ground a transistor to get the associated coil to fire. I tried both in the diagnostic menu and by playing a game.

If this were a left right relay issue I would expect to have either flashers or coils, but I don't seem to have either. I tested the flashers from the diagnostic menu, not sure of another way.

I can't seem to be able to play a game even of I simulate it by hitting switches. One suggestion I got was to look in to the blanking on the mpu. Also, before anyone suggests it, this is before data east put in the kill switch for the coin door

Not sure what you are getting at. That page appears to be a rubber list or something

Gotcha, thanks. That's interesting and I don't think I had noticed it before. Every single coil and flash lamp is out, so I'm looking for something in common

Thanks for the suggestion. I re-checked my work and I have continuity across both of those fuses (lifted one side out of the fuse holder). I also have already replaced and bad fuse clips, so it shouldn't be that either.

I also just went ahead and tested the l/r relay and that is opening and closing like it should if I ground q29. Anyone know anything about blanking signals and if a dmm can measure them?

the issue was the blanking signals. Rottendog graciously repaired my board for me. Thanks all!