Push the service switch back in or close the door. If successful, the display should show "99" or "Free," indicating unlimited credits. For NSM Digital Wallboxes
Older NSM machines use a "service switch" (usually a white or black plunger/lever) to enter programming mode. Nsm Music Jukebox Hack
If your jukebox is mechanically broken—like the common "Error 73" (CD changer jam)—hacking it might mean replacing the internal "brain" entirely. Push the service switch back in or close the door
Most users searching for an NSM hack simply want to play music without feeding the machine quarters. Depending on the era of your jukebox (ES-IV, ES-V, or Digital), the method varies. Nsm Music Jukebox Hack
Pull the switch out to enter Service Mode . The display should change to show service options.