HP Pro 4300 C9H70UT C9H70UT#ABA manual Blank or white Possible cause Recommended actions

Table 73. Blank (or white) page

Possible cause	Recommended action(s)
Software configuration (intermittent	● Make sure that the application is not sending incorrect page-
problem).	length requests or extra page-eject commands.
Network configuration. Some sharing	● Check with the network administrator.
devices on networks might generate a
blank page as a print job separator.
Multiple feeds. The printer might be	● Remove the media from the tray and flex the stack in one
feeding two or more pages at once	direction and then the other to separate the pages. Do not fan
(intermittent problem).	the stack. Replace the stack in the tray.
The sealing tape was left in the print	● Remove the sealing tape.
cartridge.
The print cartridge is empty or defective.	● Replace the print cartridge.
The laser/scanner shutter door is not	1. Remove and reseat the print cartridge.
opening correctly.	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.
No transfer-roller voltage.	● Without transfer-roller voltage, toner does not transfer correctly
	from the surface of the drum to the paper. Perform the half
	self-test functional check (see “Half self-test functional check”
	on page 310) to check the electrophotographic process. If
	necessary, replace the transfer roller. See “Transfer roller” on
	page 138.
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.
No drum ground path.	● With no drum ground path, the drum cannot discharge. The
	negative charge on the drum repels toner, and leaves a nearly-
	white page (possibly with bubbled print). Check the drum ground
	that runs from the contact point in the center of the print drum.
High-voltage circuit is defective.	● Replace the power supply. See “Power supply” on page 188.
Defective laser/scanner cable.	● Low-level signals that are exchanged between the laser/
	scanner assembly and the DC controller PCA might be affecting
	the laser output. Replace the laser/scanner cables.

Q2431-90912 Chapter 7 Troubleshooting 323