HP Pro 4300 C9H70UT C9H70UT#ABA manual Light print partial Possible cause Recommended actions

Table 55. Light print (partial page)

Possible cause	Recommended action(s)
The print cartridge is not installed	● Remove and then reinstall the print cartridge. The top cover
correctly.	should completely close when the cartridge is fully seated.
Toner supply is low or toner cartridge	1.	Shake the print cartridge gently to redistribute the toner.
developer is defective.	2.	Replace the cartridge.
Transfer roller is worn or contaminated	● Print a supplies status page (see“Supplies status page” on
or maintenance might be due.	page 242) and look at the maintenance kit gauge. If
	maintenance is due, install a maintenance kit. For information
	about ordering a maintenance kit, see chapter 8.

Table 56. Light print (entire page)

Possible cause Recommended action

Begin by performing the half self-test functional check (see “Half self-test functional check” on page 310). If the image on the print drum is light, proceed with actions 1, 2, 3, 6, and 7. If the drum image is normal, proceed with actions 5, 6, and 8.

Toner supply is low.	Action 1
	● Shake the print cartridge gently to redistribute the toner, or
	replace the cartridge.
EconoMode is on.	Action 2
EconoMode saves toner by reducing the	● Turn EconoMode off.
dot density. The effect might appear to
be a print-quality problem in some
cases.
Print density is set incorrectly	Action 3
	● Change the toner density (see“Print Quality submenu” on
	page 46) to a darker setting and try the print job again.
The media does not meet specifications.	Action 4
The moisture content, conductivity, or	● Try a different paper lot.
surface finish might not work correctly
with the electrophotographic process.
The transfer roller is defective or not	Action 5
installed correctly. If the transfer roller	● Verify the transfer roller is installed correctly. If the transfer
loses conductivity, it cannot effectively	roller is damaged, replace it. See “Transfer roller” on page 138.
pull toner from the drum.
The high-voltage connector springs are	Action 6
dirty or damaged.	● The high-voltage connectors protrude into the print cartridge
	cavity. Clean the springs if they are dirty. Replace the springs if
	they are damaged or missing.
The laser/scanner shutter door is not	Action 7
opening correctly.	1. Remove and reseat the print cartridge.
	2. Verify that the laser/scanner shutter door can open properly.
	If necessary, replace the laser/scanner assembly. See
	“Laser/scanner assembly” on page 173.
The power supply is defective. The	Action 8
power supply contains the high-voltage	● Replace the power supply. See “Power supply” on page 188
circuit.

Q2431-90912 Chapter 7 Troubleshooting 313