HP LaserJet Pro 400 MFP M425 - Manual (Page 187)

2. Check the memory chip for damage.
3. Examine the surface of the imaging drum on the
bottom of the toner cartridge.
CAUTION: Do not touch the roller (imaging
drum) on the bottom of the cartridge.
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. If the imaging drum does not appear to be
damaged, rock the toner cartridge gently several
times and reinstall it. Print a few pages to see if
the problem has resolved.
Check the paper and printing environment
Use paper that meets HP specifications
Use different paper if you are having any of the following problems:
● The printing is too light or seems faded in areas.
● Specks of toner are on the printed pages.
● Toner is smearing on the printed pages.
ENWW Improve print quality 171