Vertical lines

Make sure that the priority input tray is in place.

The photosensitive drum inside the toner cartridge has probably been scratched. Install a new HP toner cartridge. See Changing the toner cartridge for instructions.

Gray background

Make sure that the priority input tray is in place.

Decrease the print density setting through HP LaserJet Device Configuration. This decreases the amount of background shading. See Accessing the online help.

Change the media to a lighter basis weight. See Printer media specifications for more information.

Check the printer’s environment. Very dry (low humidity) conditions can increase the amount of background shading.

Install a new HP toner cartridge. See Changing the toner cartridge for instructions.

Toner smear

If toner smears appear on the leading edge of the media, the media guides might be dirty. Wipe the media guides with a dry, lint-free cloth. See Identifying the printer’s components or Cleaning the printer for more information.

Check the media type and quality.

Try installing a new HP toner cartridge. See Changing the toner cartridge for instructions.

The fuser temperature might be too low. Check Optimize for: in the Paper tab of your printer driver, and make sure that it is set to the appropriate media.

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HP 1200 manual Vertical lines, Gray background, Toner smear