Abstract: Apparatus is described for use in depositing bank deposit envelopes in a receptacle according to an enforced sequence of actions in a deposit cycle, each action having to take place within specified time periods. The apparatus includes error testing means terminating the deposit cycle at any stage thereof in which an action occurs deviating from the predetermined sequence or not within a time period specified in the sequence. The sequence controller includes a shift register having an output for each stage in the cycle, a logical gate for each stage which gate is enabled by a signal from the shift-register output of the preceding stage, and clocking means responsive to the output signals from the logical gates for clocking the shift-register.