HP LaserJet 9040/9050 Service Manual - Page 250

Note Check the print cartridge Image-formation defects often result from problems with the print cartridge. Use the following list to verify that the print cartridge is operating correctly. Perform all of the following checks before replacing the print cartridge. z Make sure that the print cartridge contains toner. • The full print cartridge weight is approximately 4,220 grams (9.28 lb). • The empty weight is approximately 2,700 grams (5.94 lb). z Check the print cartridge to see if it is disassembled or refilled. z Make sure that the print cartridge is seated correctly in the printer cavity. z Inspect the cartridge for toner leaking through worn seals (manual rotation of the drum can cause internal damage and toner spills). The print cartridge is rated for 30,000 images at 5% coverage for two-page jobs. Check the surface of the photosensitive drum in the cartridge to see if it is damaged or scratched. Touching the drum contaminates the photosensitive surface and might cause spotting and defects during printing. z White areas on the page might indicate that the drum was 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 print cartridge might be placed in a dark environment for several days, which might restore some life to the drum. EconoMode EconoMode creates draft-quality printing by reducing the amount of toner on the printed page by up to 50%. Advise the customer to turn EconoMode on or off, either from the printer driver or a software program. Skew Use the following information to gauge skew specifications. z 2 mm over 260 mm (simplex and duplex) z Leading edge plus or minus 2.5 mm (cut sheet media) z Plus or minus 4.5 mm (envelopes) z Left margin plus or minus 2.5 mm (cut sheet) 234 Chapter 7 Troubleshooting