HP Pro 4300 C9H70UT C9H70UT#ABA manual Grey background Possible cause Recommended actions

Table 60. Grey background

	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.
	Inside of the printer is dirty (toner leaked	● Clean the inside of the printer (see chapter 4). Install a new
	out of the print cartridge).	print cartridge.
	The printers operating environment	● Make sure the printer is installed in the proper environment.
	does not meet specifications.	See “Environmental specifications” on page 7.
	Printing on envelope seams. Printing on	● Move the text to an area that has no seams.
	an envelope seam can cause a
	background scatter problem.
	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. Make sure EconoMode is set to off.
	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 print cartridge is defective.	● Replace the print cartridge.
	The high-voltage connector springs are	● The high-voltage connectors protrude into the print cartridge
	dirty or damaged.	cavity. Clean the springs if they are dirty. Replace the springs if
		they are damaged or missing.
	The power supply is defective.	● Replace the power supply. See “Power supply” on page 188
Table 61. Loose toner or toner smear
	Possible cause	Recommended action(s)
	There is dirt in the printer.	1. Print a few more pages and see if the problem corrects itself.
		2. Clean the inside of the printer (see chapter 4)
		3. Process a printer cleaning page. See “Running the cleaning
		page manually” on page 56.
	The fuser roller is dirty.	● Process a cleaning page (see “To run the cleaning page
		manually” on page 56). Several pages might be required if the
		fuser is very dirty.
	The media surface is too rough or too	● Use paper with the correct finish (smoothness) to meet HP
	smooth.	specifications (see the HP LaserJet Printer Family Paper
		Specification Guide).
	Static eliminator teeth (just beyond the	● Clean the teeth with a small brush or compressed air. Replace
	transfer roller) are contaminated or not	the assembly if it is damaged.
	grounded, which allows a static charge
	to remain on the page.
	Fuser is defective. The print will smear if	● Replace the fuser. See “Fuser” on page 162.
	the fuser dose nor heat sufficiently to
	bond the toner to the paper.
	The DC controller PCA is defective. The	● Replace the DC controller PCA. See“DC controller PCA” on
	DC controller PCA regulates the fuser	page 181.
	roller temperature.

Q2431-90912 Chapter 7 Troubleshooting 317