We avionics engineers call the logic to prevent unwanted events "interlocks", simply meaning a couple of conditions have to be met before the gun can fire.
It could be the tech here in question had applied logic voltage to those conditions, satisfying the "enable" for firing.
Specifically, the F-16 gun probably can't fire when WoW (Weight-on-Wheels) is true, aka, the airplane is on the ground. WoW is redundant (reliable) all by itself, using multiple raw sensors to form the condition result, but of course, since we're talking about gun firing, there might be one more logic condition added to make double-sure this thing never went off on the ground.