Sometimes a token/coin gets stuck, and kids keep jamming more tokens in, making the jam worse.
Sometimes, someone stick a slug or nickel in and it messes stuff up.
What does the arcade technician have to do to the coin mech. system to fix these types of problems?
Do you not have the ability to look at the problem and figure this ---steaming pile of meadow muffin--- out on your own?
I was an arcade last night looking at a game my 5yr really wanted to play. Noticed all the coins were jammed in a cluster ---fudgesicle--- at the opening. Slipped the token card in, and squirreled one token out and had two drop into the coin return. I spent more timing fishing the token card out of my pocket than I did getting the jammed tokens out.
There are too many variables to list to give you a satisfactory answer. If you can't work even the most basic problems out you need to rethink your hobbies, job or whatever the hell you do asking questions like this.