HP 8000dn Service Manual - Page 419

Note Check the Toner Cartridge Image formation defects are often the result of toner cartridge problems. If there is any doubt, always replace the toner cartridge before troubleshooting image defects. Use the following check list to make sure that the toner cartridge is still operable. Make sure that the toner cartridge has toner. Full toner cartridge weight = 3000 grams (106 oz) Empty weight = 2200 grams (80.5 oz) Check the expiration date of the toner cartridge (stamped on the cartridge box). Check the toner cartridge to see if it has been disassembled or refilled. Make sure that the toner cartridge is seated properly in the printer cavity. Inspect the cartridge for toner leaking through worn seals. (If the drum has been manually rotated it may have caused internal damage and toner spills may result.) Toner cartridges are rated for 15,000 images at 5% coverage. It is possible to wear out the gears and the cartridge seals before is displayed if the 15,000 image expectancy is exceeded. Check the surface of the photosensitive drum in the toner cartridge to see if it has been damaged or scratched. Touching the drum will contaminate the photosensitive surface and may cause spotting and defects during printing. White areas on the page may indicate that the drum has been exposed to light for too long. If white areas appear, stop the printer and wait a few minutes. This should eliminate most defective images. If not, the toner cartridge may be placed in a dark environment for several days, which may restore some life to the drum. EN Image Quality 395