HP LaserJet M439 MFP
Troubleshooting. Printing quality problems 2
Dropouts
Suggested solutions
If faded areas, generally rounded, occur randomly on the page:
- A single sheet of paper may be defective. Try reprinting the job.
- The moisture content of the paper is uneven or the paper has moist spots on its surface. Try a different brand of paper.
- The paper lot is bad. The manufacturing processes can cause some areas to reject toner. Try a different kind or brand of paper.
- Change the printer option and try again. Go to Printing Preferences, click the Paper, and set type to Thick.
If these steps do not correct the problem, contact a service representative.
White Spots
Suggested solutions
If white spots appear on the page:
- The paper is too rough and a lot of dirt from paper falls to the inner components within the printer, so the transfer roller may be dirty. Clean the inside of your printer.
- The paper path may need cleaning. Clean the inside of your printer.
If these steps do not correct the problem, contact a service representative.
Vertical lines
Suggested solutions
If black vertical streaks appear on the page:
- The surface (drum part) of the cartridge inside the printer has probably been scratched. Remove the cartridge and install a new one.
If white vertical streaks appear on the page:
- The surface of the LSU part inside the printer may be dirty. Clean the inside of your printer. If these steps do not correct the problem, contact a service representative.
Black or color background
Suggested solutions
- Change to a lighter weight paper.
- Check the environmental conditions: very dry conditions or a high level of humidity (higher than 80% RH) can increase the amount of background shading.
- Remove the old toner cartridge and install a new one.
- Thoroughly redistribute the toner.