HP LaserJet 4250 Service Manual - Page 391
Image-formation troubleshooting, Media-related print-quality problems
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Image-formation troubleshooting The image-formation system is the central hub of the printer. During image formation, an image is formed with toner and then fused onto the paper. The image-formation system consists of the following physical components: ■ Laser/scanner ■ Print cartridge ■ Fuser ■ Transfer roller ■ Supporting circuitry (power supply and dc controller PCA) Before beginning the image-formation troubleshooting, check that the media meets the specifications listed in chapter 1 and the HP LaserJet Printer Family Print Media Guide. See Supported media weights and sizes and Paper and print media. Media-related print-quality problems Some print-quality problems occur when inappropriate media is used. ■ Use media that meets HP specifications. See the specifications listed in the HP LaserJet Printer Family Print Media Guide. ■ The surface of the media is too smooth. Use media that meets HP specifications. See the specifications listed in the HP LaserJet Printer Family Print Media Guide. ■ The printer driver is set incorrectly. Change the paper-type setting. ■ The media is too heavy for the printer, and the toner is not fusing to the media. ■ The transparencies are not designed for adequate toner adhesion or high fusing temperatures. Use only transparencies that are designed for monochrome HP LaserJet printers. ■ The moisture content of the paper is uneven, too high, or too low. Use paper from a different source or from an unopened ream of paper. ■ Some areas of the paper reject toner. Use paper from a different source or from an unopened ream of paper. Make sure that the paper has not been previously used. ■ The letterhead is printed on rough paper. Use a smoother, photocopy-grade paper. If this solves the problem, consult with the letterhead supplier to verify that the paper used for the letterhead meets the specifications for this printer. ■ The paper is excessively rough. Use a smoother, photocopy-grade paper. ■ The paper has a coating that is not compatible with the electrophotographic process. ■ The letterhead or other preprinted media was printed with inks or other materials that can contaminate the fuser, which causes offset or repeated images. ■ The use of some carbonless papers contaminates the printer and can cause printer damage if used repeatedly. Image-formation troubleshooting 377