HP Color LaserJet Enterprise M651 Printer series - Manual (Page 103)

Visually inspect the toner cartridge
Follow these steps to inspect each toner cartridge.
1. Remove the toner cartridge from the product.
2. Check the memory chip for damage.
3. Examine the surface of the green imaging drum.
CAUTION: Do not touch the imaging drum. Fingerprints on the imaging drum can cause print-quality
problems.
4. If you see any scratches, fingerprints, or other damage on the imaging drum, replace the toner
cartridge.
5. Reinstall the toner cartridge, and print a few pages to see if the problem has resolved.
Check paper and the printing environment
Step one: Use paper that meets HP specifications
Some print-quality problems arise from using paper that does not meet HP specifications.
● Always use a paper type and weight that this product supports.
● Use paper that is of good quality and free of cuts, nicks, tears, spots, loose particles, dust, wrinkles,
voids, staples, and curled or bent edges.
● Use paper that has not been previously printed on.
● Use paper that does not contain metallic material, such as glitter.
● Use paper that is designed for use in laser printers. Do not use paper that is designed only for use in
Inkjet printers.
● Use paper that is not too rough. Using smoother paper generally results in better print quality.
Step two: Check the environment
The environment can directly affect print quality and is a common cause for print-quality or paper-feeding
issues. Try the following solutions:
● Move the product away from drafty locations, such as open windows or doors, or air-conditioning vents.
● Make sure the product is not exposed to temperatures or humidity outside of product specifications.
● Do not place the product in a confined space, such as a cabinet.
● Place the product on a sturdy, level surface.
● Remove anything that is blocking the vents on the product. The product requires good air flow on all
sides, including the top.
● Protect the product from airborne debris, dust, steam, grease, or other elements that can leave residue
inside the product.
ENWW Improve print quality 95