The invention relates to a device for locking an adjusting means (5), in particular an electrical addressing device, mounted on a printed circuit board (1) which extends in an x and/or y direction. The device includes an essentially flat base plate (2) having a length (L), a width (B), and a thickness (D), to which a first detent spring (4) is attached for locking engagement with marking means (23, 23′) of the adjusting means (5). The first detent spring preferably has an oblong spring leg (7), wherein in the installed state the base plate (2) is mounted on the printed circuit board (1).