A method for autonomous teach-in of at least one target position of a supply device (120) of a slide imaging apparatus (110) is disclosed. The slide imaging apparatus (110) comprises at least one imaging device (126, 128) configured to generate an image of a sample mounted on a slide (140). The target position is a position on the imaging device (126, 128). The slide imaging apparatus (110) comprises at least one operating system (170) configured for controlling operation of the supply device (120). The method comprises the following steps i) (186) providing at least six pre-defined positions by using the operating system (170); ii) (188) driving the supply device (120) to the six pre-defined positions until colliding with the imaging device (126, 128) by using the operating system (170) and detecting collisions with the imaging device (126, 128); iii) (190) evaluating the detected collisions by using the operating system (170), thereby determining the target position.