HP 4000n HP LaserJet 4000, 4000 T, 4000 N, and 4000 TN Printers - Quick Refere - Page 26

Troubleshooting Steps (Continued) Light Print or Fade Specks Dropouts Lines Gray Background Toner Smear Loose Toner Repeating Defects Misformed Characters Page Skew Curl or Wave Wrinkles or Creases Troubleshooting Steps (Follow the steps in the order they are listed.)   10. Change the fuser mode setting to High or choose rough paper type from the printer driver.  11. Redistribute the toner in the toner cartridge.     12. Install a new HP toner cartridge. (See instructions provided with the toner cartridge.)   13. To alternate small and standard paper, from the Configuration Menu set SMALL PAPER SPEED=SLOW.   14. Order and install the Printer Maintenance Kit. 15. After trying all the steps suggested above, contact an HPauthorized service or support provider. (See the HP Support pages in the user's guide.) 1.Paper may be too smooth. EN Output Quality Problems - 21