Visible crew/equipment: After Kirk tells the policeman that he wants to see Merikus and "perhaps" he's a friend, the policemen lock the cell then leave, and when it cuts to a view of the cell from the side as Spock walks over to the steel bars, the overhead boom mic is visible inside the cell, over Spock. It's visible again, with a better view, when McCoy walks over to Spock beside the bars. (00:18:15)
Visible crew/equipment: Set lights are reflected in Spock's tricorder screen before he closes the cover.
Answer: After causing Norman to overload, all of the other androids shut down. The same could be said for the androids on the Enterprise.