The present invention is a system and method that facilitates the reduction of presentation glitches in a digital video system. An actuator is associated with the first and second carriage assemblies and configured such that actuation of the actuator causes the first and second carriage assemblies to move axially in opposite directions. The carriage is movably installed in the casing and will transmit a scan-finished signal after having scanned the front side of a document. The invention will be applied in the field of microelectronics for the production of transistors, of surfaces for photovoltaic panels or for direct molecular bonding.