HP 1320 Service Manual - Page 173

Image troubleshooting NOTE Print cartridge problems Checking the print cartridge Image formation defects are frequently the result of problems in the print cartridge. If there is any doubt, always replace the print cartridge before troubleshooting image defects. Use the following checklist to make sure that the print cartridge is still operable. □ Make sure that the print cartridge is installed properly and the shipping tape is removed. □ Inspect the print cartridge for toner level. □ Check the expiration date stamped on the print cartridge box. □ Check the print cartridge to see if it has been disassembled or refilled. □ Inspect the print cartridge to see if toner is leaking through worn seals. □ 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. □ 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. A standard-capacity print cartridge weighs approximately 765 grams (1.69 lb) when full and approximately 675 grams (1.49 lb) when empty. An extra-capacity print cartridge weighs approximately 986 grams (2.17 lb) when full and approximately 766 grams (1.69 lb) when empty. These values are subject to change without notice. ENWW Image troubleshooting 161