Sensor test This test verifies that the sensors on the 2,000-sheet input unit are functioning properly. 1 4 2 5 3 Figure 237. Location of sensors in the 2,000-sheet input unit 1 Paper exit sensor (PS32) 2 Paper entry sensor (PS31) 3 VTU closed sensor (PS35) 4 Paper tray raised sensor (PS34) 5 Paper tray empty sensor (PS33) To perform the test 1 Set the DIP switches on the 2,000-sheet input unit’s controller PCA for the sensor test. (See page 473 for an explanation of the settings.) EN 2,000-sheet input unit troubleshooting 475