Gray background
•The priority input tray is not in place.
•The toner density is set incorrectly.
•The media basis weight is too high.
•The humidity level is too low.
•The toner cartridge is defective.
Horizontal black lines or smears
•The media does not meet HP paper specifications or is stored improperly.
•The laser/scanner assembly or ECU is defective.
•The toner cartridge is defective or it was improperly installed.
•The printer needs to be cleaned.
•The fusing assembly is dirty or defective.
•A gear is damaged.
•A roller is damaged.
3100 and 3150 series only
•Horizontal lines appear in the margins and across entire pages of faxes, copies, and scans.
–Clean the contact image sensor.
–Recalibrate the scanner.
–Check for a problem in the contact image sensor.
252 Chapter 9 – Image quality | EN |