A Method For Judging Paper-Jam Of Printer

PURPOSE: A method for discriminating jam of printing paper in an image forming apparatus is provided to detect normal feeding and discharge of printing paper without mounting an actuator and a light sensor to the feeding side of the image forming apparatus. CONSTITUTION: A feed sensing portion is checked(S120). When the feed sensor is turned on, a timer is driven(S130). The time(T1) that a developer lamp driving member is turned on is calculated(S140). The time(T1) is compared with the reference value(T2)(S150). As the comparison result, the state when the time(T1) escapes from an error range of the reference value(T2) is discriminated as the jam and then the printing is suspended(S190).