I was out with a friend last weekend picking up some machines and one of the gentleman we were picking up a machine from said he had a Skylab that wasn't working and asked if I knew how to fix machines. I've been dabbling in SS machines for years now, and recently picked up a Gottlieb Pro-Football so I could start learning EMs. I'd like to start dipping my toes into professional repairs, and this seems like a great opportunity to get a first client.

I started taking a look in the machine and found a blown fuse on the fuse panel directly to the right (I believe it was a 15A, but I may be mistaken, and it may have been the wrong fuse). We swapped that out and got the machine to come on, but immediately the Total Play Meter (the box that counts how many games have been played) started buzzing. While mildly concerning, we kept looking around in the machine. After a moment I noticed the meter was hot, and smoking a little. At this point we turned it off and unplugged the machine, but now I'm not sure where to look.

He asked me to come back when I have more input, so I just want to see what I should be looking for and what to do. I also have a Williams Triple Action machine here I can look at in the mean time, they're fairly similar in build, so at least I have some reference rather than none at all. I stupidly didn't think to take any pictures, but I suppose I could ask for some if needed.

Any input would help and I thank you all in advance for your time.

Perfect! Thank you @argosysk. I did download the schematics, but am fairly new to reading them, so this is a huge help. I'll see when I can take a look at it and if anything comes up, I'll report back.

I am going to see the machine tomorrow, I'll try to make a note of this and get back to you