Service LED descriptions 1 2 3 Figure 236. Rear view of 2,000-sheet input unit 1 Service LEDs 2 DIP switches 3 Power supply Note Be sure to turn the power supply off and set all DIP switches to the off position when you finish the test, or the unit will not work. The DIP switch is ON if it is to the right. The DIP switch is OFF if it is to the left. Note To go from one test to another or to change the DIP switch settings, turn the power supply on the 2,000-sheet input unit to operational mode. Reset the DIP switches on the controller PCA, and then switch the power supply back to diagnostic mode to enable the new diagnostic test. EN 2,000-sheet input unit troubleshooting 471