HP 8150dn Service Manual - Page 687

Self-Diagnostics on Paper-handling Devices CAUTION 2000-sheet Input Tray Standalone Diagnostics The 2000-sheet Input Tray can run stand-alone diagnostic tests to test the device's motors, functionality, and sensors. You will need one power cord, one #2 Phillips screwdriver, and a small flat-blade screwdriver for the DIP switches. 2000-sheet Input Tray Motor Test This test verifies that the three motors on the 2000-sheet Input Tray are functioning properly. 1 Identify the Back Cover (opposite from the tray door). Remove the four screws in the Back Cover. Remove the Back Cover (see "Back Cover" on page 269). 2 Pull open the paper tray, and open the Vertical Transfer Unit (VTU). 3 Set the DIP switches on the Controller PCA to Motor Test Mode. (See Table 7-35 on page 671 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 fieldreplaceable unit: either the Paper Pickup Assembly, the VTU, or the Paper Deck Drive Assembly. 5 To stop the test, set the power switch back to Operational Mode (push in), and reset the DIP switches on the Controller PCA to the off position (see Table 7-35 on page 671). 2000-sheet Input Tray Standalone Running Test This test verifies that the 2000-sheet Input Tray is functioning properly. For this test, use the LED located on the Controller PCA on the 2000-sheet Input Tray. (See Table 7-36 on page 672 for an interpretation of the LED patterns.) If the 2000-sheet Input Tray is setting underneath the printer, paper jams may occur because the printer will not pick up the paper. To prevent excessive paper jams during this test, feed only 6 to 8 pages. 670 Chapter 7 TroubleshootingC4265-90907