Siemens ARCADIS Varic VB 13C Quick Manual page 104

Cassette exposure (option)
104
(2)
Spring (2) and positioning pins (3) must be
locked securely to keep the cassette holder
in place.
An acoustic signal sounds when the sys-
tem has stored the positions.
To delete the stored positions, you only
need to press one of the keys.
(1)
(3)
(4)
(5)