HP LaserJet 4250 Service Manual - Page 410

Table 7-33 Smudged lines (either direction) AaBbCc AaBbCc AaBbCc AaBbCc AaBbCc Possible cause The paper path is contaminated or damaged. The print cartridge has passed its life expectancy. Recommended action(s) 1 Perform the half self-test functional check. See Half self-test functional check. If the drum is damaged, replace the print cartridge. 2 Process a printer cleaning page. See Running the cleaning page manually. If the problem persists, replace the fuser. See Fuser. 3 Check the tray 1 feed roller and the rollers in the other trays. Clean or replace the rollers as necessary. 4 Check for other sources of contamination or damage in the paper path and clean or replace parts as necessary. This type of defect might also be a repetitive defect. See Repetitivedefects troubleshooting. The print cartridge has an expected life of 12,000 pages for the HP LaserJet 4200 printer and 18,000 pages for the HP LaserJet 4300 printer. Replace the print cartridge. Table 7-34 White spots on black Possible cause Recommended action(s) The media does not meet 1 Turn over the stack of media in the specifications or is not stored correctly. tray. Also try rotating the media 180°. 2 Check the media for type and quality. Replace the media if it does not meet specifications, and advise the customer to use the HPrecommended media and to store it correctly. See Media specifications. The operating environment does not meet specifications. The print cartridge is defective. Make sure that the printer is installed in an area that meets the environmental specifications. See Operating environment. Replace the print cartridge. 396 7 Troubleshooting