My name is Mike. My 31 year old son is autistic and lives for pinball...he’s been playing since he was 8. A few years back I bought him two machines: Johnny Mnemonic and NBA Fastbreak. There’s nobody around us—Northeastern PA— who repairs pins so I am doing my best. My question is about the coin door for NBA, which is not recognizing open or closed so it can’t be played. I replaced the top switch, which I assume is the power shutoff, with one that seems identical except the original is a Cherry F 79 and the new one is an E79. My understanding is theses switches are used in lots of pins and arcade games and are interchangeable. In any case it didn’t solve the problem. All wires seem in good shape and well soldered. Is there something else I should try? Could the smaller bottom switch be the problem.
Thanks in advance for any advice .
M

Thanks you so much for the help. I’ll check out those spots. One thing I’m not sure about: I’ve been focusing on the voltage shutoff switch but perhaps I should be looking at the other. Would an open door message actually block game play? The adjustment buttons don’t work —it says I have to open door to use them even when door is open—and the play button doesn’t light up or work.
Hope I’m not being a pain...I’m struggling to get his game up and running. He does love pinball

Now I’m really flummoxed. Took your advice and checked fuses. Two on the main board were blown—one was marked ‘sol” and the other ‘flash’—I will post pix. Got some new ones and popped them in. Before doing that the machine was in attract mode and all seemed okay except coin door wasn’t registering. After installing the fuses—the exact ones that were in there—nothing is working except a couple of lamps by the flippers. Not sure where to go next.

PS- At the same time I changed the batteries

Thanks, I will. Right now can’t get menu buttons to work because of the coin door issue so I’ll check for worn wires

There was some powdery ‘schmutz’ (not a technical term I know) on the contacts. I scraped it off with a needle file.

If I could run tests I might be able to identify the issue but the coin door interlock issue has me flummoxed. Replaced the top switch but it didn’t help. I will try a voltage meter next to see if they are getting current.