So I just got my Star Trek next generation two weeks ago and we love it. I decided to open it up and clean up the playfield a bit and replace the dull balls. I opened up the back box just to take a look because I have not really looked inside of it since purchasing it. I also looked inside of the cabinet and slightly lift up the playfield to see what the flipper coils look like.

Then I put the game back together and now it constantly ejects balls. It has an error saying check switch 32, 33, 34, 36, and 37.

I have no idea what I did wrong as I’ve cleaned all of my other pinball machines before and never had something like this happen. I only clean the play field and in the back box I looked at things but I didn’t unhook anything. I don’t understand what I did wrong and I’m hoping someone can give me a tip about where to start looking.

It says ‘under L Gun sw2’ and ,under R gun sw2’ and ‘right gun shooter’, ‘under lgun sw1’ and ‘under rgun sw1’ are the switches.

Thanks to everyone for the information and tips. I have been in my stern machines a lot but this STTNG is a whole new crazy complicated thing. I really appreciate everyone taking time to help me. I plan to spend some time tracing this wire back from the CPU since staring at the crazy wires under the playfield hasn't helped (the colors seemed dulled) but I did find it in the J207 pin 3.

I will look at the cannon looms as that seems to be what gun 1 and gun 2 are so I bet that's it.

Thanks particularly for this... I have tinkered with my games but I'm very much still learning. It was a bummer to break our families new favorite pin. I bought a project T2 to learn on... Now to fix this beauty.

Thanks to everyone for the help. I had a broken wire on the left cannon. I also had a problem with my diverter not functioning properly and a board that someone had hacked up a bit. I have a great Pinball genius in the bay area and this felt over my head while still learning (Plus I was getting some crap from my teenager for breaking our new favorite game lol) I am glad I called him out because he went through it and assessed it and tuned it up and told me a lot about the machine.. The good news is he said that I have one of the nicer playfields and he doesn’t know how they got it so shiny. It seems unusually clean on the board under things where it would normally be dirty so I’m wondering if it was ever shopped. They used a lot of flex LEDs to control the brightness of them. I think I’m going to be adding an OCDLED board. He said its in good condition and has had a decent amount of good work done to it and everything else was OK except this one board he had to repair. He did say he didn’t care for the rotten dog boards that were installed in that he’d rather they were original. It’s now working 100%. I think I plan on restoring this bit by bit as well as customizing it to my own liking since I think it’s going to stay in my home a long time.

I bought this machine because I loved the Stern Star Trek Pro. Funny because I think I’m going to sell that now. Still a good game this one just is sooo awesome.

Anyway you all were so awesome thank you so much. I’m going to keep learning but more on the T2 for now lol its not as loved.