HP LaserJet 4250 Service Manual - Page 408

Table 7-31 Creases Table 7-32 White lines 394 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. Make sure that the printer is installed in an area that meets the environmental specifications. See Operating environment. The media is not loaded correctly or the trays are not adjusted correctly. Make sure that the media is loaded correctly and that the guides fit snugly against the stack. The wrong tray is in use. Print from tray 1 when you use a media that can cause image-formation or paper-path problems. The wrong output bin is in use. Print to a different output bin (top or rear output bin). An obstruction exists in the paper path. 1 Check the paper path for debris. 2 Check for damaged components that might be creasing the paper. Possible cause Recommended action(s) White lines in the direction of the paper path The toner supply is low or the print cartridge is defective. 1 Shake the print cartridge gently to redistribute the toner. 2 Replace the cartridge. The laser path is dirty. Clean the laser path. Remove the laser/ scanner assembly (see Laser/scanner assembly) and check for dirt or other obstructions in the beam path. The fuser is defective. Replace the fuser. See Fuser. The mirror in the laser/scanner is dirty. Replace the laser/scanner assembly. See Laser/scanner assembly. White lines in the opposite direction of the paper path The print drum is damaged. Replace the print cartridge. 7 Troubleshooting