HP BP20N manual Vertical repetitive, Defects

		Problem	Solution
Vertical lines			If black vertical streaks appear on the page:
			• The drum inside the toner cartridge has probably been
		AaBbCc
			scratched. Install a new toner cartridge.
		AaBbCc
		AaBbCc
		AaBbCc
		AaBbCc
Gray background			If the amount of background shading becomes unacceptable,
			the procedures below may fix the problem.
	AaBbCc		• Change to a lighter weight pages. See “Paper Specifications”
	AaBbCc		on page C.3.
			• Check the printer’s environment; very dry (low humidity) or
	AaBbCc
			high humidity (higher than 80% RH) conditions can increase
	AaBbCc
			the amount of background shading.
	AaBbCc		• Remove the old toner cartridge and install a new one. See
			“Installing the Toner Cartridge” on page 2.4.
Toner smear			• Clean the inside of the printer. See “Cleaning the Inside” on
			page 5.5.
			• Check the paper type and quality. See “Paper Specifications”
			on page C.3.

•Remove the toner cartridge and install a new one. See “Installing the Toner Cartridge” on page 2.4.

Vertical repetitive		If marks repeatedly appear on the printed side of the page at
	defects	even intervals:
		• The toner cartridge may be damaged. If a repetitive mark
	AaBbCc	occurs on the page, print a cleaning sheet several times to
	AaBbCc	clean the cartridge; see page 5.7. After the printout, if you
		still have the same problems, install a new toner cartridge.
	AaBbCc
		See “Installing the Toner Cartridge” on page 2.4.
	AaBbCc	• Parts of the printer may have toner on them. If the defects
	AaBbCc	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.

6

SOLVING PROBLEMS 6.17