I worked as a technician at a store that sold arcade machines, pool tables, and man-cave furniture, among other things. In short, the machines were basically on display as a “try me” type thing, so we’d let people play a few times for free, our business being to sell the entire machine. Of course, this catered either to the richer crowd or other businesses planning on making money with the machines.
One day, a customer complained that the claw machine was shocking him when he touched it. I explained what an AC shock feels like as opposed to a static shock, and he said it was an AC shock. I asked him to point to what shocked him, and he pointed at the box where the controls were. I got my voltage detector pen from my tool kit and tested it on a known live outlet, and only then did I check the machine with it. Sure enough, all the outside metal pieces were live!
Needless to say, this was quite unsafe, but given its position, I couldn’t reach the cord without touching it. That left me with no choice but to use the breakers. I asked my coworker at the computer/register which breaker controlled those outlets.
Coworker: “I don’t know.”
Me: “You should properly shut down the computer; it might lose power in a minute.”
Coworker: “Why?”
Me: “The claw machine is shocking people, and I can’t unplug it without touching the metal parts.”
Coworker: “The computer needs to stay on.”
I literally facepalmed right in front of him.
Me: “The computer is not a life support system. The claw machine is currently a death trap, and I can’t just guard it all day. So, you have about a minute to shut the computer down before it — maybe — loses power.”
After taking a few guesses, I found the right breaker to that cluster of outlets feeding the claw machine, and thankfully, the almighty computer was not affected. (Not that there was anyone buying anything. Even if there was, a major electrical fault trumps a sale.) I safely unplugged the claw machine and turned the breakers back on. I then wheeled the machine into the back room.
As the technician in the store, this was more or less my job to repair, so after tinkering around with a multimeter and my voltage detector pen, and some trial and error (no shocks), I discovered that the machine’s power supply was faulty — AND the ground pin on the plug was also missing from it. If it had been on there, any voltage present in the case would have blown the machine’s internal fuse or the circuit breaker. I simply removed the fuse from the machine, and I put a note over the fuse slot stating why the fuse was missing and not to plug it back in without the boss’s or my permission. I then called my boss (who wasn’t there that day) and left a message.
And behold, the next day, the claw machine was back on the floor again, though in a different position, lit up and apparently ready to play. Of course, my coworkers couldn’t be trusted with so much as a USB cable, so I had to double-check that they had actually fixed it. Nope, it was still live. But how did they get it powered again when I took the fuse out?
If you guessed, “They bypassed the fuse,” then congratulations!
I did end up replacing the power supply and putting the proper fuse back in. Someone eventually replaced the plug, as well, but no one said who it was, and more importantly, they didn’t tell me where our spare plugs are so I could fix other machines that were missing their ground prongs. (That was a bit of a theme there.)
The store in question ended up going out of business a few months later.