Abstract: Unmanned apparatus for collecting scrap aluminum cans and for compensating depositors of scrap aluminum cans based on the weight of the aluminum cans deposited including a microprocessor control structure which produces control signals to control the operation of the apparatus including the dispensing of compensation, calibrating the weighing structure, and in response to alarm signals produced by operating components of the apparatus, to display the existence of any such alarm conditions, to identify their source and to deenergize the apparatus until the alarm causing conditions are corrected.