Photoelectric controller checks the original machine had all been demolished, 4&mICro;F/450V CBB motor start capacitor wire next to the motor, apparently was not reasonable repair. Because there is no genuine spare parts, TWH8778 and PH303/PH302 the switch circuit infrared transceiver on the tube, another light control switch (as shown in the figure). After receiving the power green LED light, after an infrared control transmitter and receiver, insert paper block the light path, receiving tube resistance increases, reduced 9013 transistor base voltage, by conduction to cut-off. When the collector voltage rises to the >1.6V and switch breakover, electric relay RY, if switch s in regular feed, in a reverse sweep cut roll. Launch tube current is adjustable (R2), from 10mA~15mA, to control the distance and sensitivity. Welding in a small piece of insulation of the circuit board, mounted in the rack and properly insulated. Infrared emitting and receiving tube on both sides in the feeder and alignment. Tail section as short as possible, so as not to affect continuous feed.