2 x 500-sheet Input Tray Standalone Diagnostics The standalone diagnostics are designed to test the 2 x 500-sheet Input Tray’s motors, functionality, and sensors. You will need a power cord, a #2 Phillips screwdriver, and a small flatblade screwdriver for the DIP switches. If the 2 x 500-sheet Input Tray is working properly, it picks paper up from the tray and feeds it into the VTU, while the bottom service LED flashes regularly every 0.5 seconds. Note To go from one test to another or to change the DIP switch settings, set the blue power supply switch to Operational Mode (push in).
Reset the DIP switches on the Controller PCA, and then switch the power supply back to Diagnostic Mode (pull out) to enable the new diagnostic test. See figure 7-18 on page 447 for DIP switch settings. 2 x 500-sheet Input Tray Motor Test This test verifies that the three motors on the 2 x 500-sheet Input Tray are functioning properly. 1 Identify the Back Cover (opposite side from tray door). Remove the 4 screws in the Back Cover. Remove the Back Cover. 2 Pull open Trays 4 and 5, and open the Vertical Transfer Unit (VTU). 3 Set the DIP switches on the Controller PCA to Motor Test Mode.
(See table 7-8 on page 420 for an explanation of the DIP switch settings.) 4 To turn the power supply switch to Diagnostic Mode, pull out on the blue handle. • If the motors are working properly, you will hear them as they rotate continuously. • If the motors do not rotate, replace the corresponding field- replaceable unit: either the Paper Pickup Assembly, the VTU, or the Paper Deck Drive Assembly. 5 To stop the test, set the power supply switch back to Operational Mode (push in), and reset the DIP switches on the Controller PCA to the off position. 444 Chapter 7 Troubleshooting C4085-91087