Abstract: A bill and coin changer in which a circuit employing a programmed microcomputer controls the bill-validating and coin-dispensing procedures and searches for faults in the operation of the sensors and electromechanical components of the changer. During bill validation, a bill is moved at a predetermined speed along a path past a plurality of sensors, and rejection signals are generated if a particular sensor is actuated for other than a predetermined permissible duration or generates a predetermined output within a test period delimited by the delayed output of the other sensors. In response to a rejection signal, the bill is returned to the customer and a diagnostic hexadecimal rejection code character is displayed indicating the condition prompting rejection. Jammed objects are extricated from the bill transport by alternatingly actuating the transport to move the object in one direction and then in the other upon sensing a jammed condition.

Abstract: A bill and coin changer in which a circuit employing a programmed microcomputer controls the bill-validating and coin-dispensing procedures and searches for faults in the operation of the sensors and electromechanical components of the changer. During bill validation, a bill is moved at a predetermined speed along a path past a plurality of sensors, and rejection signals are generated if a particular sensor is actuated for other than a predetermined permissible duration or generates a predetermined output within a test period delimited by the delayed output of the other sensors. In response to a rejection signal, the bill is returned to the customer and a diagnostic hexadecimal rejection code character is displayed indicating the condition prompting rejection. Jammed objects are extricated from the bill transport by alternatingly actuating the transport to move the object in one direction and then in the other upon sensing a jammed condition.

Abstract: A bill and coin changer in which a circuit employing a programmed microcomputer controls the bill-validating and coin-dispensing procedures and searches for faults in the operation of the sensors and electromechanical components of the changer. During bill validation, a bill is moved at a predetermined speed along a path past a plurality of sensors, and rejection signals are generated if a particular sensor is actuated for other than a predetermined permissible duration or generates a predetermined output within a test period delimited by the delayed output of the other sensors. In response to a rejection signal, the bill is returned to the customer and a diagnostic hexadecimal rejection code character is displayed indicating the condition prompting rejection. Jammed objects are extricated from the bill transport by alternatingly actuating the transport to move the object in one direction and then in the other upon sensing a jammed condition.

Abstract: A paper currency acceptor which performs a first magnetic test on a first predetermined area of a bill corresponding to an area of a genuine bill printed with magnetic ink to produce a credit signal in response to a genuine bill and to reject a spurious bill not printed with magnetic ink in the first area and which performs a second magnetic test on a second printed area of the bill corresponding to an area of a genuine bill printed with nonmagnetic ink to reject a spurious bill made on a copying apparatus employing magnetic toner particles.