HP LaserJet MFP M436n

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.