HP 8000dn Service Manual - Page 445

2 x 500-sheet Input Tray LED Status Interpretation If the 2 x 500-sheet Input Tray is working properly, it will pick up paper from the tray and feed it though the VTU and the bottom service LED will flash regularly every 0.5 seconds. Table 7-27. Patterns of LED flashing (2-second pause between each pattern) Long (1 sec) Short Meaning (0.3 sec) Recommended Action 3 1 Lifter malfunction Verify that the tray lifts up freely by lifting it by hand. Verify that the paper size plates are installed correctly (in the same corresponding slots) and are not bent. If neither of these is the problem, replace Tray 4 or 5. 2 1 Registration sensor The media did not reach the sensor. Open the VTU delay jam door, and remove the media. Replace the paper feed (VTU) assembly or the paper pickup assembly. 2 2 Registration sensor Open the VTU door, and remove the media. Check stationary/jam initial the sensors, and replace the corresponding jam field-replaceable unit. 2 3 Jam sensor delay jam The media did not reach the sensor. Open the VTU door, and remove the media. Replace the paper feed (VTU) assembly or the paper pickup assembly. 2 4 Jam sensor Open the VTU door, and remove the media. stationary jam/initial jam 1 1 The VTU door is open Close the door. 1 2 Trays 4/5 are open Close the tray(s). Check the sensors. Wrong paper size Load the correct size of paper. Check the sensors. loaded 1 3 No paper in trays 4/5 Load paper. Check the sensors. Note If the LEDs will not come on, replace the paper deck PCA or the universal power supply assembly. EN Diagnostics on Accessories 421