HP LaserJet 1100 Service Manual - Page 120

Image formation troubleshooting Checking the toner cartridge Image formation defects are many times the result of toner cartridge problems. If there is any doubt, always replace the toner cartridge before troubleshooting image defects. Use the following checklist to ensure that the toner cartridge is still operable. t Ensure that the toner cartridge is seated properly. t Inspect the toner cartridge for remaining toner. t Check the expiration date stamped on the toner cartridge box. t Check the toner cartridge to see if it has been disassembled or refilled. t Inspect the cartridge to see if toner is leaking through worn seals. t Check the surface of the photosensitive drum in the cartridge to see if it has been damaged or scratched. Touching the drum contaminates the photosensitive surface and can cause spotting and image defects. t Blurred areas on printed pages indicate that the photosensitive drum in the cartridge has been overexposed to light. Because overexposure to light causes permanent damage to the photosensitive drum, the cartridge should be replaced. NOTE: A toner cartridge weighs 702 grams (24.7 ounces) when it is full and 594 grams (20.9 ounces) when it is empty. To redistribute toner in the cartridge Before installing a new cartridge or when toner begins to run low, redistribute the toner by rotating the cartridge back and forth five or six times. C4224-90962 Image formation troubleshooting 125