HP Pro 4300 C9H70UT C9H70UT#ABA manual Dark print

Table 74. Dark print

Possible cause	Recommended action(s)
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 print cartridge drum is close to the	● Replace the print cartridge.
end of its expected life.
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
Poor high-voltage contact to the power	● Clean the contacts if they are dirty. If the problem persists after
supply.	cleaning, or the contacts are damaged or deformed, replace
	them.
Defective laser/scanner assembly.	● Replace the laser/scanner assembly. See “Laser/scanner
	assembly” on page 173.
Defective high-voltage circuit.	● Replace the power supply. See “Power supply” on page 188

324 Troubleshooting Q2431-90912