HP Pro 4300 C9H70UT C9H70UT#ABA manual White spots on black Possible cause Recommended actions

Table 69. White spots on black

	Possible cause	Recommended action(s)
	The media does not meet specifications	1. Turn over the stack of media in the tray. Also try rotating the
	or is not stored properly.	media 180 degrees.
		2. Check the media for type and quality. Replace the media,
		and advise the customer to use the HP recommended
		media and to store it correctly. See “Paper specifications” on
		page 9
	The printers operating environment	● Make sure the printer is installed in the proper environment.
	does not meet specifications.	See “Environmental specifications” on page 7.
	The print cartridge is defective.	● Replace the print cartridge.
Table 70. Scattered lines
	Possible cause	Recommended action(s)
	The media does not meet specifications	1. Turn over the stack of media in the tray. Also try rotating the
	or is not stored properly.	media 180 degrees.
		2. Check the media for type and quality. Replace the media,
		and advise the customer to use the HP recommended
		media and to store it correctly. See “Paper specifications” on
		page 9
	The printers operating environment	● Make sure the printer is installed in the proper environment.
	does not meet specifications.	See “Environmental specifications” on page 7.
	Wrong toner density setting.	● Access the print-quality menu at the control panel, and adjust
		the toner density setting. See “Print Quality submenu” on
		page 46.
	The high transfer setting is turned off.	● Access the print-quality menu at the control panel (see “Print
		Quality submenu” on page 46). Select OPTIMIZE and set HIGH
		TRANSFER=ON.
	The line detail setting is turned off.	● Access the print-quality menu at the control panel (see “Print
		Quality submenu” on page 46). Select OPTIMIZE and set LINE
		DETAIL=ON.
Table 71. Blurred print
	Possible cause	Recommended action(s)
	The media does not meet specifications	1. Turn over the stack of media in the tray. Also try rotating the
	or is not stored properly.	media 180 degrees.
		2. Check the media for type and quality. Replace the media,
		and advise the customer to use the HP recommended
		media and to store it correctly. See “Paper specifications” on
		page 9
	The printers operating environment	● Make sure the printer is installed in the proper environment.
	does not meet specifications.	See “Environmental specifications” on page 7.
	Wrong toner density setting.	● Access the print-quality menu at the control panel, and adjust
		the toner density setting. See “Print Quality submenu” on
		page 46.
	The high transfer setting is turned off.	● Access the print-quality menu at the control panel (see “Print
		Quality submenu” on page 46). Select OPTIMIZE and set HIGH
		TRANSFER=ON.
	The line detail setting is turned off.	● Access the print-quality menu at the control panel (see “Print
		Quality submenu” on page 46). Select OPTIMIZE and set LINE
		DETAIL=ON.

Q2431-90912 Chapter 7 Troubleshooting 321