Yeah, was working and then turned the game on yesterday and now it has decided not to work. I unplugged connector and then reseated it and turned the game back on. No luck.

I did go into settings this morning and change all the start button blinking options and no luck.

I can see it's getting power and does the startup wiggle, but then it doesn't move in game.

I'm really at a loss right now. Had a technician friend check out the servo motor and it is moving freely when the game is powered off. When it is powered on, the T-Rex head goes back to the home point and when I lightly try to move it (not forcing it), it starts to lightly hum/vibrate like it is being locked into place. We are wondering if there is some kind of error inside the control box.

If the sevro is good easy to test then it’s the control box

And nobody knows what's inside the control box? I doubt it would be user serviceable. Sounds like I need a replacement?

I had something similar occur, except I wasn’t as gentle, and ended up replacing the servo as a result, but even after that, still had the issue. I think what eventually fixed it was going through the install manual and making sure everything was aligned and placed correctly and not binding, not sure if the shaker had slowly misaligned things or what, but I haven’t had any issues since. Perhaps the servo has some sort of protection if it senses resistance.

Thanks for the tip! I don't have a shaker motor in the game, but will definitely have another look at it.

And thanks to BC_Gambit and Rockrand for the replies as well.

I took the servo completely out of the T-Rex head when I went over to my technician friend's workshop and when he looked at it on the bench, everything seemed to be moving ok....but for peace of mind, will check it again.

No worries.
My only other idea was just to triple check that the wires that trigger this mod were all connected correctly. If somehow they were all disconnected I could see a situation where the servo had power and did start up but then did nothing. But if I remember right, there were at least two to three wires for the triggers?
It seems unlikely all would have been disconnected but you never know. I do remember connecting a few of my wires a bit better than I think the default instructions were as I didn't want to have issues later.

If you have ruled all of that out then yes I for sure would contact the mod maker to see if he has any other ideas or has any extra parts available to help troubleshoot.

Yeah, there's the T-Rex event lamp, orbits and start button lamp connections....I was iffy about the pliers crushing through to the wiring when I first installed the mod. Everything seemed to work though....strange how all of a sudden it stops working when the previous day it was fine.

Tomorrow I will reseat all the connectors underneath the playfield and the other suggestions.

I just keep thinking that there's an issue with the control box because it won't move from the home point, but I have been wrong before.
:-p

Success! Yes, I was wrong...the problem was poking me in the eye and I didn't even notice. There was a lone red wire sticking out of the control box. "it must be an unused wire and it's just been snipped off."

I went through and reseated all the connectors underneath the playfield and then noticed another long red wire sitting on the bottom of the cabinet that originally led to the start button. Soldered them back on and all working again.

Thank you so much for pointing me in the direction of the under playfield connectors. This might be good help if anyone runs into issues in the future.

Cheers!
Adam.

Awesome! I'm glad to hear you got this fixed.

Great!