HP 8000dn Service Manual - Page 428

Table 7-18. Faulty Registration (continued) Possible Cause Recommended Action 3. Paper does not meet specifications. Try a different paper lot (see HP LaserJet The surface of the paper may be too Printer Family Paper Specifications smooth for the Pickup and Feed Rollers to Guide). correctly feed paper into the printer. 4. Drive gears are worn or broken. If any Replace the defective gear or Main Drive gear within the drive train or paper path assembly. See "Main Gear Assembly" on becomes excessively worn or dirty, erratic page 191 for instructions. paper movement can result. 5. Worn Pickup or Registration Rollers. Inspect all paper path rollers, looking for Paper is not being picked up consistently. wear, cracks, or glazing. Replace the worn rollers. Table 7-19. Image Skew Possible Cause Recommended Action 1. Paper is loaded incorrectly. If the paper Remove paper from the tray, and install is not installed flush into the paper tray, a paper correctly. Position the paper guide skewing problem will result. correctly for the paper size being used. 2. Paper lot is bad. Paper that is Try a different paper lot (see HP LaserJet manufactured poorly or inconsistently or Printer Family Paper Specifications that has too smooth or too rough a surface Guide). texture can cause an image skew problem. 3. Pickup and/or Registration Rollers are Inspect all paper path rollers, looking for worn. Paper is not being picked up wear, cracks, or glazing. Replace the worn consistently. rollers. 404 Chapter 7 Troubleshooting EN