Board Descriptions A - 53 OF 5300/5600 Serv Man, P/N 592783015-7 PhotosensorsThe photosensors mounted on this circuit board/sensor board supervise the paperrunning state during printing. These six photosensors are used in this printer as listedbelow. All of their outputs enter IOGA for referring to and processing by the CPU.1) PS1 (photosensor 1): PSOUTSupervises the paper feed according to the time of arrival at the sensor and thetime of passage of paper.2) PS2 (photosensor 2): WRSNSDetects the leading part of sensor.Supervises the paper running state.3) PS3 (photosensor 3): PSIN1Detects the leading part of the paper and gives the supervision timing for switchingfrom hopping operation to feeding operation. Supervises the paper running stateand the paper size according to the paper arrival time and running time.4) PS4 (photosensor 4): PAPERDetects the end of the paper.5) PS5 (photosensor 5): PSIN2Not used6) PS6 (photosensor 6): TONERDetects the lack of the toner.
