Quoted from bobukcat:
Valid points but like you said, it's hard to test all of those even playing 10 games you may not see a problem and then have random balls spit out on game 11. Or you could play 20 with no problems, transport it home and have all sorts of issues but then I guess that's always a possibility with a pinball machine.
Agreed. I might ask if they replaced any of the optos. Or better yet, all of the optos. If I were going to pay a premium for an STTNG, it's something I'd want to know had been addressed. In reality, the parts are cheap (if you buy raw LEDs and photo transistors). But the labor to install them sucks. You can't replace them all without totally disassembling the machine. Top and bottom side.
But to your point, you may not learn of a problem until 50 games in. In my case, I replaced every opto in the game and still, on a very, very rare occasion, get a random multi-ball. So I have some problem other than the opto itself. The opto board, bad connectors, who knows. I have the parts to replace every opto board header and connector (as well as the driver board connector, I already replaced that header and rebuilt the 12V circuit), but finding the time and motivation to do it is another story. =)
I can't imagine owning a STTNG without having the ability to do repairs. I would never sign up for fixing one for someone else either. Too many variables. Can you imagine taking on someone else's random multi-ball problem, and trying to do it at their house? Nope. I'm sure I'd get call back after call back. But honestly, that's why I stopped fixing machines for others....it's like fixing a car from the 70s and then having the person get pissed when it breaks down a week later, unrelated to what you already fixed. My 2 cents anyhow...