HP LaserJet M4345 Multifunction Printer series - Manual (Page 221)

NOTE These examples depict letter-size media that has passed through the device.
Light print (partial page)
1. Make sure that the print cartridge is fully installed.
2. The toner level in the print cartridge might be low. Replace the print cartridge.
3. The media might not meet HP specifications (for example, the media is too moist or too rough).
See
Select print media .
Light print (entire page)
1. Make sure that the print cartridge is fully installed.
2. Make sure that the Economode setting is turned off at the control panel and in the printer driver.
3. Open the Aministration menu at the device control panel. Open the Print Quality menu and
increase the Toner Density setting. See Print Quality menu .
4. Try using a different type of media.
5. The print cartridge might be almost empty. Replace the print cartridge.
Specks
ENWW Solve print-quality problems 209