HP LaserJet 4250 Service Manual - Page 381

Avoiding jams Use this table to help avoid specific types of jams. Table 7-8 Common causes of paper jams Cause Solution The print media does not meet HP recommended media storage and use specifications. A supply item is installed incorrectly, which causes repeated jams. You are reloading paper that has already passed through a printer or copier. Use only media that meets HP specifications. See chapter 1 in this manual or the HP print media guide (available at http://www.hp.com/support/ljpaperguide) for media recommendations. Verify that the print cartridge and the fuser are correctly installed. Do not use media that has been used previously in a printer or copier. An input tray is loaded incorrectly. Remove any excess media from the input tray. Make sure that the stack of media fits below the indicators inside of the tray. The print media is skewed. The tray guides are not adjusted correctly. Adjust the guides to hold the media firmly in place without bending it. If media heavier than 120 g/m2 (32 lb) is loaded into tray 2, tray 3, or tray 4, the media might skew. The print media is binding or sticking together. Remove the media and flex it, rotate it 180°, or flip it over. Reload the media into the tray. Do not fan media. The print media is removed before it settles into the output bin. Wait until the page completely exits the output delivery assembly before you attempt to remove the it. When you are using the duplex print feature, the print media is removed before the second side of the document is printed. Print the document again. During the duplex operation, the page will partially protrude from the output delivery assembly (when the page is being reversed). Do not attempt to grab or remove the page. Wait until the page completely exits the output delivery assembly before you attempt to remove the it. The print media is in poor condition. Replace the print media. The print media is not picked up by the Remove the top sheet of media. If the media is heavier than 120 g/m2 (32 lb), it internal rollers from Trays 2, 3 or 4. might not be picked up properly from the tray. The print media has rough or jagged edges. Replace the media. The print media is perforated or embossed. If the media does not separate easily, you might need to feed single sheets from tray 1. The printer supply items have reached the end of their useful life. The print media was not stored correctly. Check the printer control panel for messages that prompt you to replace supplies, or print a supplies status page to verify the remaining life of the supplies. Replace the print media. The media should be stored in its original packaging and in a controlled environment. Paper-path troubleshooting 367