HP LaserJet MFP M436dn
Troubleshooting. Printing quality problems 2
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.
Toner smear
Suggested solutions
- Clean the inside of the printer.
- Check the paper type and quality.
- Remove the toner cartridge and install a new one.
Vertical repetitive defects
Suggested solutions
If marks repeatedly appear on the printed side of the page at even intervals:
- The toner cartridge may be damaged. If you still have the same problem, remove the toner cartridge and, install a new one.
- Parts of the printer may have toner on them. If the defects occur on the back of the page, the problem will likely correct itself after a few more pages.
- The fusing assembly may be damaged. Contact a service representative.